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5751.

Write the structure of the major organic product in each of the following reaction : CH_(3)CH = C(CH_(3))_(2) + HBr to

Answer»

Solution :Reactions giving the structure of MAIN ORGANIC product, are as under :
`UNDERSET("2-Methylbut -2-ene") (CH_(3) - CH = OVERSET(CH_(3))overset(|) C - CH_(3) + HBr) overset("Markovnikov addition ") tounderset("2-Bromo-2-methylbutane") (CH_(3) - CH_(2) - underset(Br) underset(|) overset(CH_(3)) overset(|) C - CH_(3))`
Discussion
5752.

What is metamerism? (July '16) Give the structure and IUPAC name of the metamers of 2-methoxypropane.

Answer»

Solution : Ethers having the same molecular formula but different ALKYL groups attached on either side of the OXYGEN atom are called METAMERS of each other. This phenomenon is called metamerism.
Metamers of 2-methoxy propane `( CH_(3) -O- overset(CH_(3))overset(|)(CH) - CH_(3))`are as FOLLOWS:
(1) `CH_(3) - O- CH_(2) -CH_(2)- CH_(3)`1 - methoxy propane .
`CH_(3)- CH_(2) - O- CH_(2) - CH_(3)` Ethoxy ethane.
Discussion
5753.

Which of the following is pollution related disorder

Answer»

Hypertension
Leprosis
Silicosis
Pneumoconiosis

Solution :Silicosis is caused by inhalation of dust containing free silica or silicon DIOXIDE especially by workers ENGAGED in mining, POTTERY, ceramic industry, sand BLASTING, BUILDING and construction industries.
Discussion
5754.

What happens when : (i) Concentrated H_(2)SO_(4) is added to calcium fluoride, (ii) SO_(3) is passed through water ?

Answer»

Solution :(i) `H_(2)SO_(4)` being less volatile displaces more volatile HF from `CaF_(2)`.
`CaF_(2) + H_(2)SO_(4) rarr CaSO_(4) + 2 HF`
(ii) `SO_(3)` DISSOLVES in water to FORM `H_(2)SO_(4)`
`SO_(3) + H_(2)O rarr H_(2)SO_(4)`.
Discussion
5755.

Which of the following is not antidepressants ?

Answer»

Ipronizxid
PHENELZINE
EQUANIL
Salvarsan

Solution :SALVARSANIS an antibiotic
Discussion
5756.

Which of the following has the most stable conjugate acid ?

Answer»

`(CH_(3))_(2)NH`
`(CH_(3))_(3)N`
`C_(6)H_(5)NH_(2)`
`C_(6)H_(5)NHCH_(3)`.

Solution :`C_(6)H_(5)-NH_(5)` because it has maximum number of protons.
Discussion
5757.

triangleH for the reaction, H(g)+H(g)rarrH_2(g) will be,

Answer»

ZERO
`+ve`
`-ve`
infinite

Answer :C
Discussion
5758.

Using IUPAC norms write the formulas for the following: Potassium tetrachloridopalladate(II)

Answer»

SOLUTION :`K_(2)[PdCl_(4)]`
Discussion
5759.

What is monomer ? What is polymerization ?

Answer»

Solution :Polymers are formed by JOINING of repeating structural units on a large scale. The repeating structural units are derived from some simple and reactive molecules KNOWN as monomers.
The process of formation of polymers from respective monomers is CALLED POLYMERIZATION.
Discussion
5760.

What is the geometry of oxide of xenon formed when XeF_(6) is hydrolysed?

Answer»

SOLUTION :The oxide of XENON FORMED when `XeF_(6)` is HYDROLYSED is pyramidal geometry.
Discussion
5761.

Which of the following is a primary halide ?

Answer»

NEOPENTYL BROMIDE
ISOPROPYL bromide
2-Bromobutane
2-Bromo-2-methl PROPANE

ANSWER :A
Discussion
5762.

Two liquids A and B on mixing form an ideal solution. Their vapour pressures in the pure state are 200 and 100 mm respectively. What will be mole fraction of B in the vapour phase in equilibrium with an equimolar solution of the two ?

Answer»

<P>

Solution :In the liquid phase, `n_(B)=23.4//78=0.3, n_(T)=64.4//92=0.7." HENCE, "x_(B)=0.3, x_(T)=0.7`
`p_(B)=0.3xx75=22.5 mm, p_(T)=0.7xx22=15.4 mm , "Tota vapour PRESSURE "=22.5+15.4=37.9 mm"`
MOLE fraction of benzene in the vapour phase `=22.5//37.9=0.59.`
Discussion
5763.

The result of the following addition, 3.0560 + 0.0348 + 5.340upto correct significant figures is-

Answer»

8.4308
8.43
8.431
8.4

Answer :C
Discussion
5764.

Write reaction and condition for the following conversions : (i) Ethanal to ethanol (ii) Phenol into salicylic acid (Kolbe's reaction) (iii) 2 - Propanone into 2-methyl -2- propanol.

Answer»

SOLUTION :`UNDERSET("Ethanal")(CH_(3)CHO)overset(LiAlH_(4)or NaBH_(4))underset(orH_(2)//Ni or Na//C_(2)H_(5)OH)rarr underset("Ethanol")(CH_(3)CH_(2)OH)`

Discussion
5765.

Which of the following factor(s) affect the solubility of a gaseous solute in the fixed volume of liquid solvent ?(a) nature of solute(b) temperature(c ) pressure

Answer»

<P>(a) and (C ) at CONSTANT T
(a) and (B) at constant P
(b) and (c ) only
(c ) only

ANSWER :A::B
Discussion
5766.

Which of the following is not a bridge element of in Mendeeleev's table?

Answer»

Mg
Al
Si
Ar

Solution :`3^(RD)` PD elements are called bridge elements from which two subgroup CREATE in Mondeleedps table. Noble elements are not INCLUDED as bridge element.
Discussion
5767.

Which of the following equation represents standard heat of formation of methane ?

Answer»

`C ("diamond") + 2 H_(2)(G) rarr CH_(4)(g)`
`C ("GRAPHITE") + 2 H_(2)(g) rarr CH_(4)(g)`
`C ("diamond") + 4 H(g) rarr CH_(4)(g)`
`C ("graphite") + 4 H(g) rarr CH_(4)(g)`

Answer :B
Discussion
5768.

Which products are obtained on anode and cathode respectively when electrolysis of concentrated NaCl solution is carried out using graphite as electrodes ?

Answer»

`Cl_(2) and H_(2)`
`O_(2) and NA`
`O_(2) and H_(2)`
`Cl_(2) and Na`

SOLUTION :`Cl_(2) and H_(2)`
Discussion
5769.

To have practical applications why are cross links required in rubber ?

Answer»

Solution :Cross links BIND the PLANAR polymer SHEETS TOGETHER thereby INCREASING its eleasticity.
Discussion
5770.

Which of the following statements is correct with respect to the metal carbonyls of I^(st) transition series?

Answer»

As `M-Cpi` BONDING increase, the `C-O` bond length increases.
As positive CHARGE on the central metal atom increases, the `C-O` bond length increases.
As electron density on the central metal atom increases, the `C-O` bond length increases.
(1) and (3) both

Solution :order of `C-O` bond STRENGTH:
`[Mn(CO)_(6)]^(+)gt[Cr(CO)_(6)]gt[V(CO)_(6)]^(-)gt[Ti(CO)_(6)]^(2-)` and `[Ni(CO)_(4)]gt[Co(CO)_(4)]gt[Fe(CO)_(4)]^(2-)`
(1). True statement
(2). `As+` ve charge on te central metal atom increases, the less readily the metal can donate electron density into the `PI^(*)` orbitals of CO ligand to weaken the `C-O` bond.
(3). In the corbonylate anions, the metal has a greater electron density to be dispersed, with the result that `M-Cpi` bonding is enhanced and the `C-O` bond is diminished in strength.
Discussion
5771.

What is the best reagent to convert nitrile to primary amine?

Answer»

Solution :Reduction of nitriles with `Na//C_(2)H_(5)OH` or `LiAlH_(4)` gives primary AMINES.
`UNDERSET("ALKYL NITRILE")(R-CN) underset("or "LiAlH_(4)//"ether")overset(Na//C_(2)H_(5)OH)to underset(1^(@)" amine")(RCH_(2)NH_(2))`
Discussion
5772.

What are the similarities of C=C and C=O bonds?

Answer»

Solution :In both cases "C" ATOM is `sp^2` hybridised .
(ii) Both consist of a `sigma` bond and `PI` bond.
(iii) both have PLANAR structure.
(iv) Both exhibit addition reaction.
Discussion
5773.

When 5 moles of an ideal gas is expended at 350 K reversibly from 5 L to 40 L, then the entropy change for the process is (R = 2 cal mol^-1 K^-1)

Answer»

`9.01 CAL K^-1`
`20.8 cal K^-1`
`-15.2 cal K^-1`
`22.3 cal K^-1`

ANSWER :C
Discussion
5774.

Which of the following pairs is /are not correctly matched ?

Answer»

Sucrose : REDUCING sugar
Glucose : MUTAROTATION
Fructose : aldohexos sugar
Lactose : monosaccharide

Solution :(a) Sucrose is a non-reducing sugar.
(B) Glucose SHOWS mutarotation.
(c ) Fructose is a ketose sugar.
(d) Lactose is a DISACCHARIDE
Discussion
5775.

Which of the following is not directly applied on wouds ?

Answer»

DETTOL
HIGH CONC. Of phenol
Boric acidBHT
Iodoform

Answer :B
Discussion
5776.

Which of the following has the lowest solubility

Answer»

`CaF_(2)`
`CaCl_(2)`
`CaBr_(2)`
`CaI_(2)`

Solution :LATTICE energy of `CaF_(2)` is more than that of its hydration energy.
Discussion
5777.

Which of the following does not answer iodoform test ?

Answer»

N - BUTYL ALCOHOL
SEC - Butyl alcohol
ACETOPHENONE
Acetaldehyde

Answer :A
Discussion
5778.

Which will form two oximes with NH_2OH:

Answer»

`CH_3COCH_3`
`CH_3CH_2COCH_3`
`CH_3CHO`
`HCHO`

ANSWER :B
Discussion
5779.

Which of the following oxides of transition metals is/are amphoteric in nature.

Answer»

`Cr_2O_3`
`V_2O_5`
`Mn_2O_7`
`ZNO`

SOLUTION :NA
Discussion
5780.

What type of isomerism is shown by lactic acid.

Answer»

SOLUTION :Lactic acid contains one chiral carbon since it is ATTACHED to four different atoms/group H,OH,`CH_(3)` and COOH. Therefore, lactic acid SHOWS optical isomerism and thus exists in two stereoisomers (i.e., enantiomers) which are non-superimposable mirror images of each other
Discussion
5781.

Vapour pressure of a saturated solution of a sparingly soluble salt A_(2)B_(3) is 31.8 mm of Hg at 40^(@)C. If vapour pressure of pure water is 31.9mm of Hg at 40^(@)C, calculate the solubility product of A_(2)B_(3)at 40^(@)C.

Answer»

<P>

Solution :As `A_(2)B_(3)` is an electrolyte which ionizes to gives 5 ions, I = 5. Applying the relation
`(p^(@)-p_(s))/(p^(@))=i=(n_(2))/(n_(1))=(i n_(2))/(w_(1)//M_(1))`
If `w_(1)=1000g, n_(2)` = molality (m) of the solution
`therefore""(31.9-31.8)/(31.9)=(5xxm)/(1000//18)"or"m=(0.1)/(31.9)xx(1000)/(18)xx(1)/(5)=0.035`
As solution is dilute, molarity = molality `=0.035" mol L"^(-1)`
i.e., solubility (s) of the salt = `"0.035 mol L"^(-1)`
Now, `""{:(A_(2)B_(3)rarr2A^(3+)+3B^(2-)),("s2s3s"),(K_(sp)=(2S)^(2)(3s)^(3)=108s^(5)=108xx(0.035)^(5)=5.672xx10^(-6)):}`
Discussion
5782.

Which of the following acids doesnot exists in the free form ?

Answer»

`H_(2)SO_(2)`
`H_(2)S_(2)O_(3)`
`H_(2)SO_(3)`
`H_(2)SO_(4)`

ANSWER :A
Discussion
5783.

Which of the following reaction(s) can be used for the preparation of alkyl halides?I) CH_3CH_2OH + HCl overset(anh . ZnCl_2)(to)II) CH_3CH_2 OH + HCl toIII) (CH_3)_3 COH + HCl toIV) (CH_3)_2 CHOH + HCl overset(anh. ZnCl_2)(to)

Answer»

IV only
III and IV only
I, III and IV only
I and II only

Answer :C
Discussion
5784.

Which of the following alcohol give iodoferm test?

Answer»

Butan-1-ol
Propan-1-ol
Propan-2-ol
Ethanol

Answer :C::D
Discussion
5785.

Which combination is called Ziegler Natta catalyst ?

Answer»

TRIETHYL TETRACHLORIDE ALUMINIUM pue Titanium
Trimethyl aluminium and Titanium Trichloride
Tri METHYL aluminium and Titanium Trichloride
Tri methyl aluminium and Titanium DICHLORIDE

Solution :Triethyl Tetrachloride aluminium and Titanium
Discussion
5786.

Write the structures of the major products expected from the following reactions: (a) Mononitration of 3-methylphenol (b) Dinitration of 3-methylphenol (c) Mononitration of phenyl ethanoate.

Answer»

SOLUTION :(a) Both OH and `CH_(3)` GROUPS are o,p-directing. Therefore, positions 2,4 and 6 are activated but DUE to steric hindrance substitution does not occur at a position in between the two groups, i.e., position 2. consequently, electrophilic substitutio occurs at 4 and 6 positions giving a mixture of products.

(c) `OCOCH_(3)` is o, p-directing. however, due to steric hindrance, p-product predominates. thus,
Discussion
5787.

Which of the following is more nucleophilic in protic solvent

Answer»

`SH^-`
`I^-`
`OH^-`
`H_2O`

ANSWER :A
Discussion
5788.

Which one of the following is not an example for homogeneous catalysis?

Answer»

Contact process of manufacture of `H_(2)SO_(4)`
HABER's process of manufacture of `NH_(3)`
Acid hydrolysis of ESTER
Freidel crafts reaction

Solution :Acid hydrolysis of ester
Discussion
5789.

Which of the folowing is not an intensive property ?

Answer»

Entropy
Pressure
Temperature
Molar volume

Answer :A
Discussion
5790.

Which of the following pair make fastest coupling reaction in acidic medium?

Answer»




ANSWER :2
Discussion
5791.

Which is not an oxide ore?

Answer»

Bauxite
SIDERITE
PYROLUSITE
Cassiterite

Answer :B
Discussion
5792.

Which is not used in the determination of reaction rates

Answer»

REACTION TEMPERATURE
reaction concentration
SPECIFIC RATE constant
none

Solution :All decides the rate of reaction.
Discussion
5793.

Why are Sucralose and L-Glucose used as artificial sweeteners ?

Answer»

Solution :SUCRALOSE and L-Glucose are used as ARTIFICIAL SWEETENERS because they PROVIDE sweetness and not energy. These are also stable at cooking temperature.
Discussion
5794.

Which of the following does not exist as geometric isomers ?

Answer»

3-bromo-2-methyl-2-butene
cyclodecene
3-bromo-1-Chloro-1-pentene
3-methyl-2-pentene

Answer :A
Discussion
5795.

Which of the acids cannot be prepared by Grignard reagent ?

Answer»

ACETIC acid
succine acid
Formic acid
All of these

Solution : Carboxylic ACIDS are prepared by reaction of Grignard reagent with `CO_(2)`
`:.` Formic acid (HCOOH) has only one carbon atom.
`:.` Formic acid cannot be prepared from Grignard reagent
`underset("Grignard reagent")(RMGX)+CO_(2) to R- overset(O) overset(|)C-OMg overset(HOH) to underset("Acid")(RCOOH)`
Discussion
5796.

Which of the following is used to detect aldehydes

Answer»

Millon's test
Tollen's REAGENT
Neutral ferric CHLORIDE solution
Molisch's test

Solution :Tollen's reagent is USED to detect aldehydes. Aldehyde REDUCE Tollen's reagent to give Silver mirror while these are oxidised to acid.
Discussion
5797.

Which sequence of steps will be able to produce 3,3'-dinitro-biphenyl from benzene?

Answer»

`HNO_(3)//H_(2)SO_(4),CI_(2)//FeCI_(3),Na//"ether"`
`CI_(2)//FeCI_(3),HNO_(3),H_(2)SO_(4),Na//"ether"`
`CI_(2)//FeCI_(3),H_(2)SO_(4),Na//"ether"`
`I_(2)//HIO_(3),CI_(2)//FeCI_(3),C_(6)H_(5)NO_(2)`

Answer :A
Discussion
5798.

Which one of the following ion has the highest value of ionic radius?

Answer»

`Li^(+)`
`B^(3+)`
`O^(2-)`
`F^(-)`

ANSWER :C
Discussion
5799.

Which of the following ions is most effective in the coagulation of ferric hydroxide solution ?

Answer»

`CL^(-)` <BR>`Br^(-)`
`NO_(2)^(-)`
`SO_(4)^(2-)`

ANSWER :D
Discussion
5800.

Which of the following vitamins contains isoprene unit?

Answer»

VITAMIN A
Vitamin C
Vitamin `B_2`
Vitamin E.

ANSWER :A
Discussion