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NEET Chemistry Solved Question Paper 2014

Multiple Choice Questions

51.
Monomers of nylon 2-nylon 6 are

glycine and amino caproic acid

glycine and caproic acid

hexamethylene diamine and adipic acid

alanine and amino caproic acid.

glycine and amino caproic acid

Nylon2-nylon6 is an alternating polyamide copolymer of glycine (H₂N-CH₂-COOH) and amino caproic acid [H₂N(CH₂)₅COOH].

52.

Which one of the following is not employed as antihistamine?

Dimetane
Chloramphenicol
Seldane
Both (a) and (b

Chloramphenicol

Chloramphenicol is a bacteriostatic antibiotic drug.

53.

Assertion: Insulin is water soluble.

Reason: Insulin is a globular protein.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false

If both assertion and reason are true but reason is not the correct explanation of assertion.

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

54.

Assertion : (CH₃)₃CCOOH does not give HVZ reaction.

Reason: (CH₃)₃CCOOH does not have $α$ -hydrogen atom.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

If both assertion and reason are true and reason is the correct explanation of assertion.

Carboxylic acids having an α-hydrogen are halogenated at the α-position on treatment with chlorine or bromine in the presence of small amount of red phosphorus to give α-halocarboxylic acids. The reaction is know as Hell-Volhard- Zelinsky reaction.

55.

In Clemmensen reduction, compound is treated with

zinc amalgam + HCI
sodium amalgam+ HCI
zinc amalgam + HNO₄
sodium amalgam + HNO₃

zinc amalgam + HCI

In Clemmensen reduction, the carbonyl group of aldehydes and ketones is reduced to CH₂, group on treatment with zinc amalgam and concentrated hydrochloric acid.

${}_{/}^{∖}C = O \to_{H C L}^{Z n - H g} {}_{/}^{∖}C H_{2} + H_{2} O$

56.

Which does not give Cannizzaro reaction?

HCHO
$C_{6} H_{5} \underset{O}{\underset{∥}{C}} - CHO$
Ph-CHO
Ph-CH₂-CHO

Ph-CH₂-CHO

Aldehydes having no $α$ - H atoms undergo Cannizzaro reaction. Hence all the given compounds (except PhCH₂CHO has $α$ -H atom) will undergo Cannizzaro reaction.

57.

Assertion: Natural rubber is a polymer of isoprene.

Reason: Isoprene is a pentene.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

If assertion is true but reason is false.

Isoprene is 2-methyl-1, 3-butadiene.

58.

Maltose is made of the units

$α$ -D glucose and $β$ -D glucose
$α$ -D glucose and $β$ -D fructose
$α$ -D glucose and $β$ -D glucose
$α$ -D glucose and $β$ -D galactose.

$α$ -D glucose and $β$ -D glucose

The disaccharide maltose (malt sugar) isformed by the condensation of two moleculesof $α$ -D-glycopyranose in which C₁ of oneglucose unit is connected to C₄ of the otherglucose unit.

59.

During the dehydration of alcohols to alkenes by heating with conc. H₂SO₄ the initiating step is

elimination of water
protonation of an alcohol molecule
formation of an ester
formation of carbocation.

protonation of an alcohol molecule

The mechanism of dehydration of alcohol involves the following steps:

1. Formation of protonated alcohol
2. Formation of carbocation
3. Formation of ethene by elimination of a proton.

60.

Which one of the following is an example for homogeneous catalysis?

Manufacture of ammonia by Haber's process.
Manufacture of sulphuric acid by contact process.
Hydrogenation of oil.
Hydrolysis of sucrose in presence of dilute hydrochloric acid.

Hydrolysis of sucrose in presence of dilute hydrochloric acid.

$\underset{S u c r o s e}{C_{12} H_{22} O_{11 (a q)} + H_{2} O_{(l)}}$ $\overset{H C L_{(a q)}}{\to}$ $\underset{G l u c o s e}{C_{6} H_{12}} O_{6 (a q)}$ $\underset{F r u c t o s e}{+ C_{6} H_{12} O_{6 (a q)}}$