Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

31.

Primary alcohols can be obtained from the reaction of R Mg X with

  • CO2

  • HCHO

  • CH3CHO

  • H2O


B.

HCHO

The above reaction with acetaldehyde, CO2 and H2O gives 2°alcohol, acid and alkane respectively.


32.

Gabriel phthalimide reaction is used for the preparation of

  • primary aromatic amines

  • secondary amines

  • primary aliphatic amines

  • tertiary amines


C.

primary aliphatic amines

Gabriel's phthalimide synthesis is used for the preparation of primary aliphatic amines.


33.

Which one of the following proteins transports oxygen in the blood stream?

  • Myoglobin

  • Insulin

  • Albumin

  • Haemoglobin


D.

Haemoglobin

Haemoglobin is metalloprotein (a protein that contains a metal) which binds with oxygen and transport it in the blood stream.


34.

The general molecular formula for disaccharide is

  • C12H22O11

  • C10H20O10

  • C12H20O10

  • C12H22O10


A.

C12H22O11

Disaccharides are the carbohydrates which on hydrolysis gives two same or different monosaccharides. Their general formula is C12H22O11. eg,

C12H22O11 + H2OH+C6H12O6 + C6H12O6

sucrose glucose fructose


35.

The monomers of terylene are

  • phenol and formaldehyde

  • ethylene glycol and phthalic acid

  • adipic acid and hexamethylenediamine

  • ethylene glycol and terephthalic acid


D.

ethylene glycol and terephthalic acid

Terylene it is a polymer of ethylene (ethane-1,2-diol) and terephthalic (benzene-1,4-dicarboxylic acid).


36.

Proteins are composed of

  • α- amino acids

  • carbohydrates

  • vitamins

  • mineral salts


A.

α- amino acids

Proteins are long polymers ofα- amino acids linked by peptide (-CO-NH) bonds.


37.

Which of the following statement is correct ?

  • +I group stabilises a carbocation

  • +I group stabilises a carbanion

  • -I group stabilises a carbocation

  • -I group stabilises a free radical


A.

+I group stabilises a carbocation

+I group (i.e., electron donating groups) stabilises the carbocation. +I and -I groups destabilises the carbanion and carbocations respectively. +I groups stabilised the free radicals but -I group destabilised them.


38.

Common alum is

  • K2SO4.Al2(SO4)3.24H2O

  • (NH4)2SO4.FeSO4.6H2O

  • K2SO4.Cr2(SO4)3.24H2O

  • K2SO4.Fe2(SO4)3.24H2O


A.

K2SO4.Al2(SO4)3.24H2O

Common alum is K2SO4.Al2(SO4)3.24H2O.


39.

Heating of rubber with sulphur is called

  • vulcanisation

  • galvanisation

  • sulphonation

  • bessemerisation


A.

vulcanisation

Vulcanisation is a chemical process which is used to harden rubber. During this process, sulphur forms cross links at the reactive sites of double bonds and thus results in hardening of rubber.


40.

Ethyl alcohol reacts with thionyl chloride to give

  • CH3CH2Cl + HCl

  • CH3CH2Cl + H2O + SO2

  • CH3CH2Cl +HCl + SO2

  • CH3CH2Cl +SO2 + Cl2


C.

CH3CH2Cl +HCl + SO2

CH3CH2OH + SOCl2CH3CH2Cl + HCl + SO2

This method is preferred for the preparation of alkyl halide because both by product of the reaction ( i.e, SO2 and HCl) are gases and can easily escape leaving behind pure alkyl halide.