32 + Interview Questions in Neet in Aiims Page 1 InterviewSolution

1.	Arrange the given compounds in decreasing order of boiling points.
Answer» The correct option is (a). Explanation: Magnitude of van der Waals' forces goes on decreasing with branching. Hence,the order of boiling points is

1.

Arrange the given compounds in decreasing order of boiling points.

Answer»

The correct option is (a).

Explanation:

Magnitude of van der Waals' forces goes on decreasing with branching. Hence,the order of boiling points is

Discussion

2.	An aromatic compound C7H6Cl2(A), gives AgCl on boiling with alcoholic AgNO2solution and yields C7H7OClon treatment with sodium hydroxide. (A) on oxidation gives monochlorobenzoic acid. The compound (A) is
Answer» The correct option is (a). Explanation:

2.

An aromatic compound C7H6Cl2(A), gives AgCl on boiling with alcoholic AgNO2solution and yields C7H7OClon treatment with sodium hydroxide. (A) on oxidation gives monochlorobenzoic acid. The compound (A) is

Answer»

The correct option is (a).

Explanation:

Discussion

3.	The decreasing order of 5N2 reaction for the given compounds is
Answer» The correct option is (b). Explanation:

3.

The decreasing order of 5N2 reaction for the given compounds is

Answer»

The correct option is (b).

Explanation:

Discussion

4.	The correct order of reactivityinSNIreaction for the following compounds is
Answer» The correct option is (c). Explanation:

4.

The correct order of reactivityinSNIreaction for the following compounds is

Answer»

The correct option is (c).

Explanation:

Discussion

5.	Whatis the product of following reaction :
Answer» The correct option is (b). Explanation: This is a SN2reaction, and Walden inversion takes place in which configuration becomes opposite.

5.

Whatis the product of following reaction :

Answer»

The correct option is (b).

Explanation:

This is a SN2reaction, and Walden inversion takes place in which configuration becomes opposite.

Discussion

6.	Assertion : Alkyl iodide can be prepared by treating alkyl chloride/bromide with NaIin acetone.Reason : NaCl/NaBr are soluble in acetone while NaIis not.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not correct explanation of A(c) A is true but R is false(d) A and R are false
Answer» The correct option is(c) A is true but R is false. Explanation: This is Finkelstein reaction which involves the conversion of an alkyl chloride/bromide to an alkyl iodide by the addition of sodium iodide in acetone. Because sodiumiodide is soluble in acetone and NaCl and NaBr are not, the equilibrium is shifted by the precipitation of insoluble salt. The equilibrium position of the reaction depends on the nucleophilicity of the anion, whether a good leaving group is present and whether one anion is better stabilised than the other in a given solvent.

6.

Assertion : Alkyl iodide can be prepared by treating alkyl chloride/bromide with NaIin acetone.Reason : NaCl/NaBr are soluble in acetone while NaIis not.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not correct explanation of A(c) A is true but R is false(d) A and R are false

Answer»

The correct option is(c) A is true but R is false.

Explanation:

This is Finkelstein reaction which involves the conversion of an alkyl chloride/bromide to an alkyl iodide by the addition of sodium iodide in acetone. Because sodiumiodide is soluble in acetone and NaCl and NaBr are not, the equilibrium is shifted by the precipitation of insoluble salt.

The equilibrium position of the reaction depends on the nucleophilicity of the anion, whether a good leaving group is present and whether one anion is better stabilised than the other in a given solvent.

Discussion

7.	Assertion : 1, 2-dichloroethane is optically active.Reason : Meso compound is optically active.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not correct explanation of A(c) A is true but R is false(d) A and R are false
Answer» The correct option is(d) A and R are false. Explanation: Since it has no chiral carbon, it is optically inactive. Meso compounds are opticallyinactive.

7.

Assertion : 1, 2-dichloroethane is optically active.Reason : Meso compound is optically active.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not correct explanation of A(c) A is true but R is false(d) A and R are false

Answer»

The correct option is(d) A and R are false.

Explanation:

Since it has no chiral carbon, it is optically inactive. Meso compounds are opticallyinactive.

Discussion

8.	The wavelength of light absorbed is highest in(a) [Co(NH3)5Cl]2+(b) [Co(NH3)5H2O]3+(c) [Co(NH3)6]3+(d) [Co(en)3]3+
Answer» The correct option is(a) [Co(NH3)5Cl]2+. Explanation: As in complex [Co(NH3)5Cl]2+Cl- is present as ligand which is weakest among ligands present in other complexes, so it requires less energy for excitation. Thus, the wavelength of light absorbed will be highest (i.e., E∝l/λ).

8.

The wavelength of light absorbed is highest in(a) [Co(NH3)5Cl]2+(b) [Co(NH3)5H2O]3+(c) [Co(NH3)6]3+(d) [Co(en)3]3+

Answer»

The correct option is(a) [Co(NH3)5Cl]2+.

Explanation:

As in complex [Co(NH3)5Cl]2+Cl- is present as ligand which is weakest among ligands present in other complexes, so it requires less energy for excitation. Thus, the wavelength of light absorbed will be highest (i.e., E∝l/λ).

Discussion

9.	Sodiumthiosulphate is used in photography to(a) reduce AgBr grains to metallic Ag(b) dissolve out Ag produced by reduction(c) remove unaffected AgBr in the photographic filmor plate(d) none of these
Answer» The correct option is(c) remove unaffected AgBr in the photographic filmor plate. Explanation: In photography, AgBr is mainly used as the light sensitive material. The unchanged AgBr after developing the film is treated with Na2S2O3. Solution of sodium thiosulphate is used as fixer and forms a soluble complex with silver halide. AgBr + 2Na2S2O3---->Na3[Ag(S2O3)2] + NaBr

9.

Sodiumthiosulphate is used in photography to(a) reduce AgBr grains to metallic Ag(b) dissolve out Ag produced by reduction(c) remove unaffected AgBr in the photographic filmor plate(d) none of these

Answer»

The correct option is(c) remove unaffected AgBr in the photographic filmor plate.

Explanation:

In photography, AgBr is mainly used as the light sensitive material. The unchanged AgBr after developing the film is treated with Na2S2O3. Solution of sodium thiosulphate is used as fixer and forms a soluble complex with silver halide.

AgBr + 2Na2S2O3---->Na3[Ag(S2O3)2] + NaBr

Discussion

10.	dsp2hybridisation is found in(a) [Ni(CN)4]2-(b) [CoCl4]2-(c) [CuCl4]3-(d) [CuCl4]2
Answer» The correct option is(a) [Ni(CN)4]2-. Explanation: Electronic configuration of Ni: Therefore, hybridisation is dsp2and structure is square planar.

10.

dsp2hybridisation is found in(a) [Ni(CN)4]2-(b) [CoCl4]2-(c) [CuCl4]3-(d) [CuCl4]2

Answer»

The correct option is(a) [Ni(CN)4]2-.

Explanation:

Electronic configuration of Ni:

Therefore, hybridisation is dsp2and structure is square planar.

Discussion

11.	Which one of the following forms with an excess of CN- (cyanide) a complex having coordination number two?(a) Cu+(b) Ag+(c) Ni2+(d) Fe2+
Answer» The correct option is(b) Ag+. Explanation: Ag+of AgCN is soluble in excess cyanide ion to form [Ag(CN)2]-complex.

11.

Which one of the following forms with an excess of CN- (cyanide) a complex having coordination number two?(a) Cu+(b) Ag+(c) Ni2+(d) Fe2+

Answer»

The correct option is(b) Ag+.

Explanation:

Ag+of AgCN is soluble in excess cyanide ion to form [Ag(CN)2]-complex.

Discussion

12.	The ligand calledπ-acid is(a) Co(b) NH3(c) C2O42-(d) ethylenediamine.
Answer» The correct option is(a) Co. Explanation: Carbon monoxide isπ-acid ligand as it characterises both metal to carbon and carbon to metal bonding. The latter is known asπ-acidic character.

12.

The ligand calledπ-acid is(a) Co(b) NH3(c) C2O42-(d) ethylenediamine.

Answer»

The correct option is(a) Co.

Explanation:

Carbon monoxide isπ-acid ligand as it characterises both metal to carbon and carbon to metal bonding. The latter is known asπ-acidic character.

Discussion

13.	Identify the incorrect statement(s).I. Bioballistic is a method in which vectors of pathogens are allowed to infect the cell to transfer the recombinant DNA.II. Microinjection is a method when cells are bombarded with high velocity particles of gold coated with DNA.III. Heat shock is a method when the recombinant DNA is incubated with the host cells at 80-100°C.Choose the correct option.(a) Only I(b) Only II(c) Only III(d) All of these
Answer» Answer is (d)All of these Bioballistic is bombarding cell with high velocity DNA coated particles, while microinjection is injecting recombinant DNA directly into nucleus of host cell. Heat shock is placing cell incubated with DNA alternatively in cold and hot environment.

13.

Identify the incorrect statement(s).I. Bioballistic is a method in which vectors of pathogens are allowed to infect the cell to transfer the recombinant DNA.II. Microinjection is a method when cells are bombarded with high velocity particles of gold coated with DNA.III. Heat shock is a method when the recombinant DNA is incubated with the host cells at 80-100°C.Choose the correct option.(a) Only I(b) Only II(c) Only III(d) All of these

Answer»

Answer is (d)All of these

Bioballistic is bombarding cell with high velocity DNA coated particles, while microinjection is injecting recombinant DNA directly into nucleus of host cell. Heat shock is placing cell incubated with DNA alternatively in cold and hot environment.

Discussion

14.	Which of the following statement(s) is/are correct about tocopherols, also called ‘beauty vitamins’?(a) It is an antioxidant(b) It protects unsaturated fatty acids and membranes(c) Its deficiency causes sterility and muscular atrophy(d) All of the above
Answer» Answer is (d)All of the above Vitamin-E or tocopherol is commonly called ‘antisterility vitamin’ or ‘beauty vitamin’. It removes scars and wrinkles of skin. Its deficiency causes infertility and muscular atrophy.

14.

Which of the following statement(s) is/are correct about tocopherols, also called ‘beauty vitamins’?(a) It is an antioxidant(b) It protects unsaturated fatty acids and membranes(c) Its deficiency causes sterility and muscular atrophy(d) All of the above

Answer»

Answer is (d)All of the above

Vitamin-E or tocopherol is commonly called ‘antisterility vitamin’ or ‘beauty vitamin’. It removes scars and wrinkles of skin. Its deficiency causes infertility and muscular atrophy.

Discussion

15.	Which of the following ion does not exist?(a) [CuI4]2-(b) VO43-(c) WO42-(d) CrO42-
Answer» The correct option is(a) [CuI4]2-. Explanation: [CuI4]2-does not exist because I- being a stronger reducing agent reduces Cu2+to Cl+. 2CuI2---> 2CuI + I2

15.

Which of the following ion does not exist?(a) [CuI4]2-(b) VO43-(c) WO42-(d) CrO42-

Answer»

The correct option is(a) [CuI4]2-.

Explanation:

[CuI4]2-does not exist because I- being a stronger reducing agent reduces Cu2+to Cl+.

2CuI2---> 2CuI + I2

Discussion

16.	An atom of mass number 15 and atomic number 7 captures anα-particle and then emits a proton. The mass number and atomic number of the resulting atom will be respectively(a) 14 and 2(b) 15 and 3(c) 16 and 4(d) 18 and 8
Answer» The correct option is(d) 18 and 8. Explanation: According to the law of conservation of charge, we get 7 + 2 = 1 + Z; Z = 8 According to the law of conservation of mass, we get 15 + 4 = 1 + A; A = 18 Hence, the resulting atom has mass number 18 and atomic number 8.

16.

An atom of mass number 15 and atomic number 7 captures anα-particle and then emits a proton. The mass number and atomic number of the resulting atom will be respectively(a) 14 and 2(b) 15 and 3(c) 16 and 4(d) 18 and 8

Answer»

The correct option is(d) 18 and 8.

Explanation:

According to the law of conservation of charge, we get 7 + 2 = 1 + Z; Z = 8

According to the law of conservation of mass, we get

15 + 4 = 1 + A; A = 18

Hence, the resulting atom has mass number 18 and atomic number 8.

Discussion

17.	Assertion: 90Sr from the radioactive fall out from a nuclear bomb ends up in the bones of human beings through the milk consumed by them. It causes impairment of the production of red blood cells.Reason : The energeticβ-particles emitted in the decay of 90Sr damage the bone marrow.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not correct explanation of A(c) A is true but R is false(d) A and R are false
Answer» The correct option is (a). Explanation: Assertion is true 9038Sr decays to 9039Y by the emission ofβ-rays. Sr gets absorbed in bones along with calcium. Reason is also true.90Sr +β---->90Y Strontium decays to Yitrium. This emitsβ-rays of very high energy. Sr does not emitγ-rays. The damage is by theβ-rays only.

17.

Assertion: 90Sr from the radioactive fall out from a nuclear bomb ends up in the bones of human beings through the milk consumed by them. It causes impairment of the production of red blood cells.Reason : The energeticβ-particles emitted in the decay of 90Sr damage the bone marrow.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not correct explanation of A(c) A is true but R is false(d) A and R are false

Answer»

The correct option is (a).

Explanation:

Assertion is true 9038Sr decays to 9039Y by the emission ofβ-rays. Sr gets absorbed in bones along with calcium.

Reason is also true.90Sr +β---->90Y

Strontium decays to Yitrium. This emitsβ-rays of very high energy. Sr does not emitγ-rays. The damage is by theβ-rays only.

Discussion

18.	Assertion : Heavy water preferred over ordinary water as a moderator in reactors.Reason: Heavy water, used for slowing down the neutrons, has lesser absorption probability of neutrons than ordinary water.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not correct explanation of A(c) A is true but R is false(d) A and R are false
Answer» The correct option is(a) Both A and R are true and R is the correct explanation of A. Explanation: A bombarding particle gives up most energy when it makes an elastic collision with a particle of similar mass. For neutrons, hydrogen atoms would be most effective but unfortunately absorption occurs. However, deuterium(heavy water) and carbon (as graphite) are both suitable in which less absorption occurs. Therefore they are used as moderators.

18.

Assertion : Heavy water preferred over ordinary water as a moderator in reactors.Reason: Heavy water, used for slowing down the neutrons, has lesser absorption probability of neutrons than ordinary water.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not correct explanation of A(c) A is true but R is false(d) A and R are false

Answer»

The correct option is(a) Both A and R are true and R is the correct explanation of A.

Explanation:

A bombarding particle gives up most energy when it makes an elastic collision with a particle of similar mass. For neutrons, hydrogen atoms would be most effective but unfortunately absorption occurs. However, deuterium(heavy water) and carbon (as graphite) are both suitable in which less absorption occurs. Therefore they are used as moderators.

Discussion

19.	Genetically Modified Organisms (GMOs) are developed by rDNA technology and genetic engineering. They are useful in(a) enhancing food’s nutritional value(b) reducing in the post-harvest losses(c) increasing the tolerance power of crops against the abiotic stresses(d) All of the above
Answer» Answer is (d)All of the above GMOs developed by rDNA technology and genetic engineering are useful in enhancing the nutritional value of food. They reduce the post-harvest losses. They are also useful in increasing the tolerance power of crops against the abiotic stresses.

19.

Genetically Modified Organisms (GMOs) are developed by rDNA technology and genetic engineering. They are useful in(a) enhancing food’s nutritional value(b) reducing in the post-harvest losses(c) increasing the tolerance power of crops against the abiotic stresses(d) All of the above

Answer»

Answer is (d)All of the above

GMOs developed by rDNA technology and genetic engineering are useful in enhancing the nutritional value of food. They reduce the post-harvest losses. They are also useful in increasing the tolerance power of crops against the abiotic stresses.

Discussion

20.	Assertion : The binding energy per nucleon, for nuclei with atomic mass number A> 100 decreases with A.Reason : The nuclear forces are weak for heavier nuclei.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not correct explanation of A(c) A is true but R is false(d) A and R are false
Answer» The correct option is(b) Both A and R are true but R is not correct explanation of A. Explanation: The decrease in binding energy per nucleon for heavy nuclei (A> 100) due to increase in coulombrepulsion between the protons insidethenucleus.

20.

Assertion : The binding energy per nucleon, for nuclei with atomic mass number A> 100 decreases with A.Reason : The nuclear forces are weak for heavier nuclei.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not correct explanation of A(c) A is true but R is false(d) A and R are false

Answer»

The correct option is(b) Both A and R are true but R is not correct explanation of A.

Explanation:

The decrease in binding energy per nucleon for heavy nuclei (A> 100) due to increase in coulombrepulsion between the protons insidethenucleus.

Discussion

21.	Assertion: Glycosides are hydrolysed in acidic conditions.Reason: Glycosides are acetals.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not correct explanation of A(c) A is true but R is false(d) A and R are false
Answer» The correct option is: (d) Explanation: Glycosides are formed by treating glucose with CH3OH in the presence of dry HCl gas and can be hydrolysed by strong reagents like HCN, NH2OH and C6H5NHNH2. Also, glycosides are known as hemi-acetals.

21.

Assertion: Glycosides are hydrolysed in acidic conditions.Reason: Glycosides are acetals.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not correct explanation of A(c) A is true but R is false(d) A and R are false

Answer»

The correct option is: (d)

Explanation:

Glycosides are formed by treating glucose with CH3OH in the presence of dry HCl gas and can be hydrolysed by strong reagents like HCN, NH2OH and C6H5NHNH2. Also, glycosides are known as hemi-acetals.

Discussion

22.	Assertion: Carboxypeptidase is an exopeptidase.Reason: It cleaves the N-terminalbond.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not correct explanation of A(c) A is true but R is false(d) A and R are false
Answer» The correct option is: (c) Explanation: Carboxypeptidase is an exopeptidase because it breaks the peptide chain at terminal ends. Carboxypeptidase cleaves carboxy-terminal amino acids that have aromatic or branched aliphatic side chains.

22.

Assertion: Carboxypeptidase is an exopeptidase.Reason: It cleaves the N-terminalbond.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not correct explanation of A(c) A is true but R is false(d) A and R are false

Answer»

The correct option is: (c)

Explanation:

Carboxypeptidase is an exopeptidase because it breaks the peptide chain at terminal ends. Carboxypeptidase cleaves carboxy-terminal amino acids that have aromatic or branched aliphatic side chains.

Discussion

23.	Assertion: Maltose is a reducing sugar which gives two moles of D-glucose on hydrolysis.Reason: Maltose has a 1,4-β-glycosidic linkage.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not correct explanation of A(c) A is true but R is false(d) A and R are false
Answer» The correct option is: (c) Explanation: On hydrolysis one mole of maltose yields two moles of D-glucose. It is a reducing sugar. The two glucose units are linked throughα-glycosidic Iinkage between C- 1 of one unit and the C-4 of another.

23.

Assertion: Maltose is a reducing sugar which gives two moles of D-glucose on hydrolysis.Reason: Maltose has a 1,4-β-glycosidic linkage.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not correct explanation of A(c) A is true but R is false(d) A and R are false

Answer»

The correct option is: (c)

Explanation:

On hydrolysis one mole of maltose yields two moles of D-glucose. It is a reducing sugar. The two glucose units are linked throughα-glycosidic Iinkage between C- 1 of one unit and the C-4 of another.

Discussion

24.	Assertion: Millon's test is a test for identification ofproteins.Reason: Millon's reagent is a solution of mercurous nitrate and mercuric nitrate in nitric acid containing little nitrous acid.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not correct explanation of A(c) A is true but R is false(d) A and R are false
Answer» The correct option is: (b) Explanation: Millon's test is used for identification of proteins. When Millon's reagent is added to the aqueous solution of a protein, a white precipitate is formed.

24.

Assertion: Millon's test is a test for identification ofproteins.Reason: Millon's reagent is a solution of mercurous nitrate and mercuric nitrate in nitric acid containing little nitrous acid.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not correct explanation of A(c) A is true but R is false(d) A and R are false

Answer»

The correct option is: (b)

Explanation:

Millon's test is used for identification of proteins. When Millon's reagent is added to the aqueous solution of a protein, a white precipitate is formed.

Discussion

25.	Assertion: Solubility of proteins is minimum at the isoelectric point.Reason: At isoelectric point, protein molecule behaves as a zwitter ion.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not correct explanation of A(c) A is true but R is false(d) A and R are false
Answer» The correct option is: (a) Explanation: At isoelectric point, protein molecules behave as zwitter ions and hence, do not move toward any electrode or act as neutral molecules. This reduces their solubility to minimum and thus, helps in their separation and purification.

25.

Assertion: Solubility of proteins is minimum at the isoelectric point.Reason: At isoelectric point, protein molecule behaves as a zwitter ion.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not correct explanation of A(c) A is true but R is false(d) A and R are false

Answer»

The correct option is: (a)

Explanation:

At isoelectric point, protein molecules behave as zwitter ions and hence, do not move toward any electrode or act as neutral molecules. This reduces their solubility to minimum and thus, helps in their separation and purification.

Discussion

26.	Assertion: Insulin is water soluble.Reason: Insulin is a globular protein.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not correct explanation of A(c) A is true but R is false(d) A and R are false
Answer» The correct option is: (b) Explanation: Insulin is a globular protein. This protein has three-dimensional folded structure. These are stabilised by internal hydrogen bonding, hence, they are water soluble.

26.

Assertion: Insulin is water soluble.Reason: Insulin is a globular protein.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not correct explanation of A(c) A is true but R is false(d) A and R are false

Answer»

The correct option is: (b)

Explanation:

Insulin is a globular protein. This protein has three-dimensional folded structure. These are stabilised by internal hydrogen bonding, hence, they are water soluble.

Discussion

27.	Assertion: All enzymes are made up of proteins and all proteins have three dimensional structures.Reason: Secondary structures of protein are sequence of amino acids.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not correct explanation of A(c) A is true but R is false(d) A and R are false
Answer» The correct option is: (d) Explanation: All enzymes are made up of proteins and all proteins do not have 3-dimensional structures. Structure of proteins are classified as primary, secondary, tertiary and quaternary structure and only tertiary structure is 3-dimensional. The sequence in which the amino acids are arranged in a protein is called primary structure of protein.

27.

Assertion: All enzymes are made up of proteins and all proteins have three dimensional structures.Reason: Secondary structures of protein are sequence of amino acids.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not correct explanation of A(c) A is true but R is false(d) A and R are false

Answer»

The correct option is: (d)

Explanation:

All enzymes are made up of proteins and all proteins do not have 3-dimensional structures. Structure of proteins are classified as primary, secondary, tertiary and quaternary structure and only tertiary structure is 3-dimensional. The sequence in which the amino acids are arranged in a protein is called primary structure of protein.

Discussion

28.	Assertion: Nucleotides are phosphate esters of nucleosides.Reason: The various nucleotides in nucleic acids are linked either through purine or pyrimidine bases.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not correct explanation of A(c) A is true but R is false(d) A and R are false
Answer» The correct option is: (c) Explanation: The various nucleotides in nucleic acids are linked through phosphate ester groups.

28.

Assertion: Nucleotides are phosphate esters of nucleosides.Reason: The various nucleotides in nucleic acids are linked either through purine or pyrimidine bases.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not correct explanation of A(c) A is true but R is false(d) A and R are false

Answer»

The correct option is: (c)

Explanation:

The various nucleotides in nucleic acids are linked through phosphate ester groups.

Discussion

29.	Isoprene is(a) 3-methyl- 1,2-butadiene(b) 2-methyl- 1,3-butadiene(c) 3-chloro-1,2-butadiene(d) 2-chloro- 1,3-butadiene.
Answer» The correct option is:(b) 2-methyl- 1,3-butadiene Explanation: Isoprene is a monomer of natural rubber.

29.

Isoprene is(a) 3-methyl- 1,2-butadiene(b) 2-methyl- 1,3-butadiene(c) 3-chloro-1,2-butadiene(d) 2-chloro- 1,3-butadiene.

Answer»

The correct option is:(b) 2-methyl- 1,3-butadiene

Explanation:

Isoprene is a monomer of natural rubber.

Discussion

30.	Nylon-6, 6 is made by using(a) succinic acid(b) benzylchloride(c) benzaldehyde(d) adipic acid.
Answer» The correct option is:(d) adipic acid. Explanation: Nylon-6, 6 is prepared from monomers, adipic acid and hexamethylene diamine by condensation process.

30.

Nylon-6, 6 is made by using(a) succinic acid(b) benzylchloride(c) benzaldehyde(d) adipic acid.

Answer»

The correct option is:(d) adipic acid.

Explanation:

Nylon-6, 6 is prepared from monomers, adipic acid and hexamethylene diamine by condensation process.

Discussion

31.	Teflon is a polymer of(a) tetrafluoroethylene(b) tetrabromoethylene(c) tetraiodoethylene(d) tetrachloroethylene.
Answer» The correct option is:(a) tetrafluoroethylene Explanation: Teflon is polytetrafluoroethylene and it is prepared from tetrafluoroethylene by heating under pressure in the presence of ammonium peroxydisulphate. It is chemically inert and heat resistant polymer.

31.

Teflon is a polymer of(a) tetrafluoroethylene(b) tetrabromoethylene(c) tetraiodoethylene(d) tetrachloroethylene.

Answer»

The correct option is:(a) tetrafluoroethylene

Explanation:

Teflon is polytetrafluoroethylene and it is prepared from tetrafluoroethylene by heating under pressure in the presence of ammonium peroxydisulphate.

It is chemically inert and heat resistant polymer.

Discussion

32.	Monomers of nylon-2-nylon-6 are(a) glycine and amino caproic acid(b) glycine and caproic acid(c) hexamethylene diamine and adipic acid(d) alanine and amino caproic acid.
Answer» The correct option is:(a) glycine and amino caproic acid Explanation: Nylon-2-nylon-6 is an alternating polyamide copolymer of glycine (H2N-CH2-COOH)and amino caproic acid [H2N(CH2)5COOH].

32.

Monomers of nylon-2-nylon-6 are(a) glycine and amino caproic acid(b) glycine and caproic acid(c) hexamethylene diamine and adipic acid(d) alanine and amino caproic acid.

Answer»

The correct option is:(a) glycine and amino caproic acid

Explanation:

Nylon-2-nylon-6 is an alternating polyamide copolymer of glycine (H2N-CH2-COOH)and amino caproic acid [H2N(CH2)5COOH].

Discussion

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Arrange the given compounds in decreasing order of boiling points.

An aromatic compound C7H6Cl2(A), gives AgCl on boiling with alcoholic AgNO2solution and yields C7H7OClon treatment with sodium hydroxide. (A) on oxidation gives monochlorobenzoic acid. The compound (A) is

The decreasing order of 5N2 reaction for the given compounds is

The correct order of reactivityinSNIreaction for the following compounds is

Whatis the product of following reaction :

Assertion : 1, 2-dichloroethane is optically active.Reason : Meso compound is optically active.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not correct explanation of A(c) A is true but R is false(d) A and R are false

The wavelength of light absorbed is highest in(a) [Co(NH3)5Cl]2+(b) [Co(NH3)5H2O]3+(c) [Co(NH3)6]3+(d) [Co(en)3]3+

Sodiumthiosulphate is used in photography to(a) reduce AgBr grains to metallic Ag(b) dissolve out Ag produced by reduction(c) remove unaffected AgBr in the photographic filmor plate(d) none of these

dsp2hybridisation is found in(a) [Ni(CN)4]2-(b) [CoCl4]2-(c) [CuCl4]3-(d) [CuCl4]2

Which one of the following forms with an excess of CN- (cyanide) a complex having coordination number two?(a) Cu+(b) Ag+(c) Ni2+(d) Fe2+

The ligand calledπ-acid is(a) Co(b) NH3(c) C2O42-(d) ethylenediamine.

Which of the following statement(s) is/are correct about tocopherols, also called ‘beauty vitamins’?(a) It is an antioxidant(b) It protects unsaturated fatty acids and membranes(c) Its deficiency causes sterility and muscular atrophy(d) All of the above

Which of the following ion does not exist?(a) [CuI4]2-(b) VO43-(c) WO42-(d) CrO42-

An atom of mass number 15 and atomic number 7 captures anα-particle and then emits a proton. The mass number and atomic number of the resulting atom will be respectively(a) 14 and 2(b) 15 and 3(c) 16 and 4(d) 18 and 8

Genetically Modified Organisms (GMOs) are developed by rDNA technology and genetic engineering. They are useful in(a) enhancing food’s nutritional value(b) reducing in the post-harvest losses(c) increasing the tolerance power of crops against the abiotic stresses(d) All of the above

Assertion: Glycosides are hydrolysed in acidic conditions.Reason: Glycosides are acetals.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not correct explanation of A(c) A is true but R is false(d) A and R are false

Assertion: Carboxypeptidase is an exopeptidase.Reason: It cleaves the N-terminalbond.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not correct explanation of A(c) A is true but R is false(d) A and R are false

Assertion: Insulin is water soluble.Reason: Insulin is a globular protein.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not correct explanation of A(c) A is true but R is false(d) A and R are false

Isoprene is(a) 3-methyl- 1,2-butadiene(b) 2-methyl- 1,3-butadiene(c) 3-chloro-1,2-butadiene(d) 2-chloro- 1,3-butadiene.

Nylon-6, 6 is made by using(a) succinic acid(b) benzylchloride(c) benzaldehyde(d) adipic acid.

Teflon is a polymer of(a) tetrafluoroethylene(b) tetrabromoethylene(c) tetraiodoethylene(d) tetrachloroethylene.

Monomers of nylon-2-nylon-6 are(a) glycine and amino caproic acid(b) glycine and caproic acid(c) hexamethylene diamine and adipic acid(d) alanine and amino caproic acid.