Subject

Chemistry

Class

NEET Class 12

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

 Multiple Choice QuestionsMultiple 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.


A.

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


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


B.

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.


A.

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


A.

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/=OHCLZn-HgC/H2+H2O


56.

Which does not give Cannizzaro reaction?

  • HCHO

  • C6H5CO-CHO

  • Ph-CHO

  • Ph-CH2-CHO


D.

Ph-CH2-CHO

Aldehydes having noα - 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.


C.

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.


C.

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.


B.

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.


D.

Hydrolysis of sucrose in presence of dilute hydrochloric acid.

C12H22O11(aq)+H2O(l)SucroseHCL(aq)C6H12GlucoseO6(aq)+C6H12O6(aq)Fructose