67 + Interview Questions in INTRODUCTION-TO-ORGANIC-CHEMISTRY IN GENERAL AWARENESS Page 1 InterviewSolution

1.	The correct order of boiling points of hydrogen halide is:A. `HF gt HCI gt HBr gt HI`B. `HI gt HBr gt HCI gt HF`C. `HCI gt HF gt HI gt HBr`D. `HF gt HI gt HBr gt HCI`
Answer» Correct Answer - D

Discussion

2.	Which one of the following compounds is an allylic halide?A. B. C. D.
Answer» Correct Answer - C (a) in vinylic (b) is benzylic (c) is allylic (d) is arylic

Discussion

3.	Suggest a method to purify benzene containing non-volatile impurities:A. Steam distillationB. distillation under reduced pressureC. simple distillationD. sublimation
Answer» Correct Answer - C

Discussion

4.	Distillation under reduced pressure is used to purify liquids which:A. are highly volatileB. have high boiling pointsC. are explosivesD. decomposes below their boiling points
Answer» Correct Answer - D

Discussion

5.	Two immiscible liquids are separated by:A. separating funnelB. fractional distillationC. chromatographyD. sublimation
Answer» Correct Answer - A

Discussion

6.	A mixture of camphor and benzoic acid can be separated byA. sublimationB. fractional distillationC. chemical methodD. extraction with solvents
Answer» Correct Answer - C

Discussion

7.	Separation of two substances by fractional crystallisation depends upon their differences in:A. densitiesB. volatilityC. solubilityD. crystalline shape
Answer» Correct Answer - C

Discussion

8.	Double bond equivalents help in search for structure of a compound. It involves following steps: Calculate the expected number of hydrogen atoms in the saturated structure. (a) For `C_(n)` there would be: `(2n+2)` hydrogens if compound contains C,H,O only. (b) For `C_(n),N_(m)` there would be `(2n+2+m)` hydrogens. Subtract the actual number of hydrogen and divide by 2. This gives the double bond equivalents. Ring is considered to possess single DBE. Double bond equivalent of `C_(7)H_(16)O` would be
Answer» Correct Answer - A

Discussion

9.	Which of the following gives correct arrangement of compounds involved based on their bond strength?A. `HF gt HCI gt HBr gt HI`B. `HI gt HBr gt HCI gt HF`C. `HF gt HBr gt HCI gt HI`D. `HCI gt HF gt HBr gt HI`
Answer» Correct Answer - A

Discussion

10.	How many bonds are there in A. `14sigma, 8pi`B. `18 sigma, 8pi`C. `19 sigma, 4pi`D. `14 sigma, 2pi`
Answer» Correct Answer - C

Discussion

11.	The electronegativity follows the order:A. `F gt CI gt Br gt O`B. `F gt O gt CI gt Br`C. `O gt F gt CI gt Br`D. `CI gt F gt O gt Br`
Answer» Correct Answer - B Electronegativity decreases from F to I and O is next to F in order of decreasing electronegativity.

Discussion

12.	Only sp and `sp^(2)` hybrid orbitals are involved in the formation of :A. `CH_(3)-CH=CH_(2)`B. `CH_(3)-CH_(3)`C. `CH_(3)-C-=CH`D. `H_(2)C=C=CH_(2)`
Answer» Correct Answer - D

Discussion

13.	The correct order regarding the electronegativity of hybrid orbitals of carbon is ?A. `sp lt sp^(2) gt sp^(3)`B. `sp lt sp^(2) lt sp^(3)`C. `sp gt sp^(2) lt sp^(3)`D. `sp gt sp^(2) gt sp^(3)`
Answer» Correct Answer - D

Discussion

14.	The compound in which underlined carbon uses only its `sp^(3)`-hybrid orbitals for bond formation is:A. `CH_(3)underset(-)(C)OOH`B. `CH_(3)underset(-)(C)ONH_(2)`C. `CH_(3)underset(-)(C)H_(2)OH`D. `CH_(3)underset(C)H=CH_(2)`
Answer» Correct Answer - C

Discussion

15.	Petroleum refining involvs:A. vaccum distillationB. Fractional distillationC. Steam distillationD. passing over activated charcoal
Answer» Correct Answer - B Crude petroleum is subjected for fractional distillation to get different products.

Discussion

16.	Naphthalene is a volatile solid. It is best purified by:A. crystallisationB. distillationC. steam distillationD. sublimation
Answer» Correct Answer - D

Discussion

17.	Refining of petroleum does not involve:A. simple distillationB. steam distillationC. fractional distillationD. distillation under reduced pressure
Answer» Correct Answer - A::C::D

Discussion

18.	Styrene can be purified by:A. simple distillationB. fractional distillationC. vaccum distillationD. steam distillation
Answer» Correct Answer - D

Discussion

19.	For which of the following molecule significant `mu ne0` ? A. III and IVB. only IC. I and IID. only III
Answer» Correct Answer - A

Discussion

20.	The correct order of decreasing H-C-H angle in the following molecule is: A. `I gt II gt III`B. `II gt I gt III`C. `III gt II gt I`D. `I gt III gt II`
Answer» Correct Answer - B

Discussion

21.	Absolute alcohol can be prepared from rectified spirit byA. azeotrpoic distillation with benzeneB. fractional distillationC. keeping over fresh `CaO` for few hours and then distillingD. distillation under reduced pressure
Answer» Correct Answer - A::C

Discussion

22.	How many sigma and pi bonds are there in tetracyano ethylene molecule?A. `9sigma` and `9pi`B. `9sigma` and `7pi`C. `5sigma` and `9pi`D. `5 sigma` and `7pi`
Answer» Correct Answer - A

Discussion

23.	The C-H bond distance is the longest in:A. `C_(2)H_(2)`B. `C_(2)H_(4)`C. `C_(2)H_(6)`D. `C_(2)H_(2)Br_(2)`
Answer» Correct Answer - C

Discussion

24.	The number of `sigma` and `pi`-bonds in but-1-en-3-yne areA. 5 sigma and 5 piB. 7 sigma and 3piC. 8 sigma and 2 piD. 6 sigma and 4pi
Answer» Correct Answer - B

Discussion

25.	The enolic form of butanone containsA. `12 sigma` bonds, `1pi` bond and 2 lone pairs of electronB. `11 sigma` bonds, `1pi` bond and 2 lone pairs of electronsC. `12sigma` bonds, `1pi` bonds and 1 lone pair of electronsD. `10sigma` bonds, `2pi` bonds and 2 lone pairs of electrons
Answer» Correct Answer - A

Discussion

26.	Two molecules indicated below are capable to intramolecular H-bonding. Which is likely to form more stable hydrogen bonds? A. IB. IIC. Both are equally capableD. Cannot be predicted
Answer» Correct Answer - A

Discussion

27.	(A) Acetone (b.pt 329K) and methyl alcohol (b.pt 338K) are separated by fractional distillation. (R) Fractional distillation helps in separating two liquids from their mixture when their boiling points differ by `10^(@)C`.A. Statement-1 (A) and statement-2 (R) are true and statement-2 (R) is the correct explanation for statement-1 (A).B. Statement-1 (A) and statement-2 (R) are true and statement-2 (R) is not the correct explanation for statement-1 (A)C. Statement-1 (A) is true, statement-2 (R) is falseD. Statement-1 (A) is false, statement-2 (R) is true
Answer» Correct Answer - A

Discussion

28.	Two volatile and miscible liquids can be separated by fractional distillation into pure components under the conditions when:A. they have low boiling pointsB. the difference in their boiling points is largeC. the boiling points of the liquids are close to each otherD. they do not form azeotropic mixture
Answer» Correct Answer - D

Discussion

29.	p-Hydroxybenzoic acid has a lower boiling point than o-hydroxybenzoic acid. o-Hydorxybenzoic acid has intramolecular hydrogen bonding.A. Statement-1 (A) and statement-2 (R) are true and statement-2 (R) is the correct explanation for statement-1 (A).B. Statement-1 (A) and statement-2 (R) are true and statement-2 (R) is not the correct explanation for statement-1 (A)C. Statement-1 (A) is true, statement-2 (R) is falseD. Statement-1 (A) is false, statement-2 (R) is true
Answer» Correct Answer - D

Discussion

30.	The distillation technique most sited for separating glycerol from spent lye in the soap industry isA. simple distillationB. fractional distillationC. steam distillationD. Distillation under reduced pressure
Answer» Correct Answer - D

Discussion

31.	Assertion `:` Thiophene present in commercial benzene as an impurity can be removed by shaking the mixture with cold concentrated `H_(2)SO_(4)`. Reason`:` Thiophene is a heterocyclic aromatic compound.A. Statement-1 (A) and statement-2 (R) are true and statement-2 (R) is the correct explanation for statement-1 (A).B. Statement-1 (A) and statement-2 (R) are true and statement-2 (R) is not the correct explanation for statement-1 (A)C. Statement-1 (A) is true, statement-2 (R) is falseD. Statement-1 (A) is false, statement-2 (R) is true
Answer» Correct Answer - B

Discussion

32.	Which of the following compounds can be purified by steam distillation?A. SalicyladehydeB. BromobenzeneC. p-Hydroxy benzaldehydeD. Nitrobenzene
Answer» Correct Answer - A::B::D

Discussion

33.	Which are correct regarding boiling point?A. B. C. D.
Answer» Correct Answer - A::B::C::D

Discussion

34.	(A) Mixture of glucose and m-dinitrobenzene can be separated by shaking it with ether. (R) Glucose is soluble in water.A. Statement-1 (A) and statement-2 (R) are true and statement-2 (R) is the correct explanation for statement-1 (A).B. Statement-1 (A) and statement-2 (R) are true and statement-2 (R) is not the correct explanation for statement-1 (A)C. Statement-1 (A) is true, statement-2 (R) is falseD. Statement-1 (A) is false, statement-2 (R) is true
Answer» Correct Answer - B

Discussion

35.	(A) Oils are purified by steam distillation. (R) The compounds which decompose at their boiling points can be purified by steam distillation.A. Statement-1 (A) and statement-2 (R) are true and statement-2 (R) is the correct explanation for statement-1 (A).B. Statement-1 (A) and statement-2 (R) are true and statement-2 (R) is not the correct explanation for statement-1 (A)C. Statement-1 (A) is true, statement-2 (R) is falseD. Statement-1 (A) is false, statement-2 (R) is true
Answer» Correct Answer - C

Discussion

36.	Steam distillation is applied to those organic compounds which are steam volatile and:A. soluble in waterB. insoluble in waterC. sparingly soluble in waterD. insoluble in all solvents
Answer» Correct Answer - B

Discussion

37.	Which of the following organic compounds has the same hybridization as its combustion product `(CO_(2))` ?A. EthyneB. EtheneC. EthaneD. Ethanol
Answer» Correct Answer - A

Discussion

38.	Chromatography analysis is done based on the property of:A. diffusionB. condensationC. absorptionD. adsorption
Answer» Correct Answer - D

Discussion

39.	The main source of organic compounds is:A. vegetable kingdomB. synthetic reactionsC. animal kingdomD. petroleum
Answer» Correct Answer - B

Discussion

40.	The property of catenation is strongest in carbon because:A. it ionisation potential is lowB. its electronegativity is lowC. the C-C bond energy is highD. its atomic radius is small
Answer» Correct Answer - C

Discussion

41.	Allyl cyanide hasA. 9 sigma bond, 4pi bonds and no lone pairB. 9 sigma bonds, 3pi bonds and one lone pairC. 8 sigma bonds, 5 pi bonds and one lone pairD. 8 sigma bonds, 3pi bonds and two lone pairs
Answer» Correct Answer - B

Discussion

42.	(A) is a higher phenol and (B) is an aromatic carboxylic acid. Separation of a mixture of (A) and (B) can be carried out easily by using a solution of:A. `NaOH`B. limeC. `NaHCO_(3)`D. `Na_(2)CO_(3)`
Answer» Correct Answer - C

Discussion

43.	A mixture of oil and water is separated by:A. filtrationB. using separating funnelC. sublimationD. fractional distillation
Answer» Correct Answer - B

Discussion

44.	Which of the substance is purified by sublimation?A. NaphthaleneB. Benzoic acidC. CamphorD. All of these
Answer» Correct Answer - D

Discussion

45.	The enolic form of acetone containsA. 9 sigma bonds, 1 pi bond and 2 lone pairs of electronsB. 8 sigma bonds, 2 pi bonds are 2 lone pairs of electronsC. 10 sigma bonds, 1 pair pi bond and 1 lone pair of electronD. 9 sigma bonds, 2 pi bonds and 1 lone pair of electron
Answer» Correct Answer - A

Discussion

46.	Which of the following molecules does not have net dipole moment?A. `CH_(3)-Br`B. `CH_(2)CI_(2)`C. D. `HCOOH`
Answer» Correct Answer - C

Discussion

47.	The `CI - C - CI` angle in `1, 1, 2, 2`, tetrachloroethone and tetrachloromethane respectively will be about:A. `90^(@)` and `109.5^(@)`B. `109.5^(@)` and `90^(@)`C. `109.5^(@)` and `120^(@)`D. `120^(@)` and `109.5^(@)`
Answer» Correct Answer - D

Discussion

48.	Indicate the number of `sigma` and `pi` bonds in the following molecules: (i) `CH_(3)-CH=CH_(2)` (ii) `CH_(3)-CH_(2)-CH_(2)-CH_(3)` (iii) `CH_(3)-C-=C-CH_(3)` (iv)
Answer» For finding out the number of `sigma`-and `pi`-bonds in a molecule, the following points should be kept in mind: 1. All single bonds are sigma bonds. 2. All double bonds consists of one `sigma`-and one `pi-`bonds. 3. All triple bonds consist of one `sigma`-and two `pi-`bonds. (i) This molecule consists of even single bonds and one double bond. Thus, number of `sigma`-bonds = 8 and number of `pi`-bond = 1. (ii) This molecule consists of 13 single bonds. Thus, number of `sigma`-bonds = 13. (iii) This molecule consists of 8 single bonds and one triple bond. Thus, number of `sigma`-bonds = 9 and number of `pi`-bonds = 2. (iv) The molecule of benzene consists of nine single bonds and three double bonds. Thus, number of `sigma`-bonds = 12 and number of `pi`-bonds = 3.

Discussion

49.	In the compound `HC-=C-overset(" "CH_(3))overset(\|)(C)=CH_(2)`, the hybridization of `C_(2)` and `C_(3)` carbons are respectively:A. `sp^(3)` and `sp^(2)`B. `sp^(2)` and `sp^(3)`C. `sp^(3)` and spD. `sp^(2)` and sp
Answer» Correct Answer - D

Discussion

50.	`p-`nitrophenol and `o-`nitrophenol are separated byA. crystallisationB. fractional distillationC. distillationD. steam distillation
Answer» Correct Answer - D

Discussion

Explore topic-wise InterviewSolutions in .

The correct order of boiling points of hydrogen halide is:A. `HF gt HCI gt HBr gt HI`B. `HI gt HBr gt HCI gt HF`C. `HCI gt HF gt HI gt HBr`D. `HF gt HI gt HBr gt HCI`

Which one of the following compounds is an allylic halide?A. B. C. D.

Suggest a method to purify benzene containing non-volatile impurities:A. Steam distillationB. distillation under reduced pressureC. simple distillationD. sublimation

Distillation under reduced pressure is used to purify liquids which:A. are highly volatileB. have high boiling pointsC. are explosivesD. decomposes below their boiling points

Two immiscible liquids are separated by:A. separating funnelB. fractional distillationC. chromatographyD. sublimation

A mixture of camphor and benzoic acid can be separated byA. sublimationB. fractional distillationC. chemical methodD. extraction with solvents

Separation of two substances by fractional crystallisation depends upon their differences in:A. densitiesB. volatilityC. solubilityD. crystalline shape

Which of the following gives correct arrangement of compounds involved based on their bond strength?A. `HF gt HCI gt HBr gt HI`B. `HI gt HBr gt HCI gt HF`C. `HF gt HBr gt HCI gt HI`D. `HCI gt HF gt HBr gt HI`

How many bonds are there in A. `14sigma, 8pi`B. `18 sigma, 8pi`C. `19 sigma, 4pi`D. `14 sigma, 2pi`

The electronegativity follows the order:A. `F gt CI gt Br gt O`B. `F gt O gt CI gt Br`C. `O gt F gt CI gt Br`D. `CI gt F gt O gt Br`

Only sp and `sp^(2)` hybrid orbitals are involved in the formation of :A. `CH_(3)-CH=CH_(2)`B. `CH_(3)-CH_(3)`C. `CH_(3)-C-=CH`D. `H_(2)C=C=CH_(2)`

The correct order regarding the electronegativity of hybrid orbitals of carbon is ?A. `sp lt sp^(2) gt sp^(3)`B. `sp lt sp^(2) lt sp^(3)`C. `sp gt sp^(2) lt sp^(3)`D. `sp gt sp^(2) gt sp^(3)`

The compound in which underlined carbon uses only its `sp^(3)`-hybrid orbitals for bond formation is:A. `CH_(3)underset(-)(C)OOH`B. `CH_(3)underset(-)(C)ONH_(2)`C. `CH_(3)underset(-)(C)H_(2)OH`D. `CH_(3)underset(C)H=CH_(2)`

Petroleum refining involvs:A. vaccum distillationB. Fractional distillationC. Steam distillationD. passing over activated charcoal

Naphthalene is a volatile solid. It is best purified by:A. crystallisationB. distillationC. steam distillationD. sublimation

Refining of petroleum does not involve:A. simple distillationB. steam distillationC. fractional distillationD. distillation under reduced pressure

Styrene can be purified by:A. simple distillationB. fractional distillationC. vaccum distillationD. steam distillation

For which of the following molecule significant `mu ne0` ? A. III and IVB. only IC. I and IID. only III

The correct order of decreasing H-C-H angle in the following molecule is: A. `I gt II gt III`B. `II gt I gt III`C. `III gt II gt I`D. `I gt III gt II`

Absolute alcohol can be prepared from rectified spirit byA. azeotrpoic distillation with benzeneB. fractional distillationC. keeping over fresh `CaO` for few hours and then distillingD. distillation under reduced pressure

How many sigma and pi bonds are there in tetracyano ethylene molecule?A. `9sigma` and `9pi`B. `9sigma` and `7pi`C. `5sigma` and `9pi`D. `5 sigma` and `7pi`

The C-H bond distance is the longest in:A. `C_(2)H_(2)`B. `C_(2)H_(4)`C. `C_(2)H_(6)`D. `C_(2)H_(2)Br_(2)`

The number of `sigma` and `pi`-bonds in but-1-en-3-yne areA. 5 sigma and 5 piB. 7 sigma and 3piC. 8 sigma and 2 piD. 6 sigma and 4pi

The enolic form of butanone containsA. `12 sigma` bonds, `1pi` bond and 2 lone pairs of electronB. `11 sigma` bonds, `1pi` bond and 2 lone pairs of electronsC. `12sigma` bonds, `1pi` bonds and 1 lone pair of electronsD. `10sigma` bonds, `2pi` bonds and 2 lone pairs of electrons

Two molecules indicated below are capable to intramolecular H-bonding. Which is likely to form more stable hydrogen bonds? A. IB. IIC. Both are equally capableD. Cannot be predicted

The distillation technique most sited for separating glycerol from spent lye in the soap industry isA. simple distillationB. fractional distillationC. steam distillationD. Distillation under reduced pressure

Which of the following compounds can be purified by steam distillation?A. SalicyladehydeB. BromobenzeneC. p-Hydroxy benzaldehydeD. Nitrobenzene

Which are correct regarding boiling point?A. B. C. D.

Steam distillation is applied to those organic compounds which are steam volatile and:A. soluble in waterB. insoluble in waterC. sparingly soluble in waterD. insoluble in all solvents

Which of the following organic compounds has the same hybridization as its combustion product `(CO_(2))` ?A. EthyneB. EtheneC. EthaneD. Ethanol

Chromatography analysis is done based on the property of:A. diffusionB. condensationC. absorptionD. adsorption

The main source of organic compounds is:A. vegetable kingdomB. synthetic reactionsC. animal kingdomD. petroleum

The property of catenation is strongest in carbon because:A. it ionisation potential is lowB. its electronegativity is lowC. the C-C bond energy is highD. its atomic radius is small

Allyl cyanide hasA. 9 sigma bond, 4pi bonds and no lone pairB. 9 sigma bonds, 3pi bonds and one lone pairC. 8 sigma bonds, 5 pi bonds and one lone pairD. 8 sigma bonds, 3pi bonds and two lone pairs

(A) is a higher phenol and (B) is an aromatic carboxylic acid. Separation of a mixture of (A) and (B) can be carried out easily by using a solution of:A. `NaOH`B. limeC. `NaHCO_(3)`D. `Na_(2)CO_(3)`

A mixture of oil and water is separated by:A. filtrationB. using separating funnelC. sublimationD. fractional distillation

Which of the substance is purified by sublimation?A. NaphthaleneB. Benzoic acidC. CamphorD. All of these

The enolic form of acetone containsA. 9 sigma bonds, 1 pi bond and 2 lone pairs of electronsB. 8 sigma bonds, 2 pi bonds are 2 lone pairs of electronsC. 10 sigma bonds, 1 pair pi bond and 1 lone pair of electronD. 9 sigma bonds, 2 pi bonds and 1 lone pair of electron

Which of the following molecules does not have net dipole moment?A. `CH_(3)-Br`B. `CH_(2)CI_(2)`C. D. `HCOOH`

The `CI - C - CI` angle in `1, 1, 2, 2`, tetrachloroethone and tetrachloromethane respectively will be about:A. `90^(@)` and `109.5^(@)`B. `109.5^(@)` and `90^(@)`C. `109.5^(@)` and `120^(@)`D. `120^(@)` and `109.5^(@)`

Indicate the number of `sigma` and `pi` bonds in the following molecules: (i) `CH_(3)-CH=CH_(2)` (ii) `CH_(3)-CH_(2)-CH_(2)-CH_(3)` (iii) `CH_(3)-C-=C-CH_(3)` (iv)

In the compound `HC-=C-overset(" "CH_(3))overset(|)(C)=CH_(2)`, the hybridization of `C_(2)` and `C_(3)` carbons are respectively:A. `sp^(3)` and `sp^(2)`B. `sp^(2)` and `sp^(3)`C. `sp^(3)` and spD. `sp^(2)` and sp

`p-`nitrophenol and `o-`nitrophenol are separated byA. crystallisationB. fractional distillationC. distillationD. steam distillation