Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

31.

In a set of reactions, acetic acid yielded a product D.

CH3COOH SOCl2  A anhyd. AlCl3Benzene B HCN C HOH  D

The structure of D would be


A.

In the above reaction,

CH3COOH SOCl2 CH3OCl anhyd. AlCl3Benzene  


32.

Aniline in a set of reactions yielded a product D

The structure of the product D would be

  • C6H5CH2NH2

  • C6H5NHCH2CH3

  • C6H5NHOH

  • C6H5CH2OH


D.

C6H5CH2OH

In the above figure, product D is C6H5CH2OH.


33.

The major organic product formed from the following reaction (ii) LiAlH4 (iii) H2O(i) CH3NH2 ... is


B.

The major organic product formed from the above given equation is


34.

The monomer of the polymer

 

  • H2C = C(CH3)2

  • (CH3)2C = C(CH3)2

  • CH3CH = CH CH3

  • CH3CH = CH2


A.

H2C = C(CH3)2

The monomer of the above given polymer is

CH2 = C(CH3)2

This is because it shows cationic polymerisation.


35.

The correct order of acid strength is

  • HClO < HClO2 < HClO3 < HClO4

  • HClO4 < HClO < HClO2 < HClO3

  • HClO2 < HClO3 < HClO4 < HClO

  • HClO4 < HClO3 < HClO2 < HClO


A.

HClO < HClO2 < HClO3 < HClO4

Correct order of acid strength is

HClO+1 < HClO2+3 < HClO3+5 < HClO4+7

Acid strength  oxidation number


36.

Which functional group participates in disulphide bond formation in proteins?

  • Thiolactone

  • Thiol

  • Thioether

  • Thioester


B.

Thiol

Disulphide bond may be reduced to thiol by means of reagents, such as, NaBH4, which shows the presence of thiol group in disulphide bond formation.


37.

Electrolytic reduction of nitrobenzene in weakly acidic medium gives

  • aniline

  • nitrosobenzene

  • N-phenylhydroxylamine

  • p-hydroxyaniline


A.

aniline

Electrolytic reduction of nitrobenzene in weakly acidic medium gives aniline but in strongly acidic medium it gives p-aminophenol through the acid-catalysed rearrangement of the initially formed phenylhydroxylamine.

   C6H5NO2            in weakly acidic mediumElectrolytic reduction           C6H5NH2

Nitrobenzene                                                       Aniline


38.

Which of the following undergoes nucleophilic substitution exclusively by SN1 mechanism?

  • Benzyl chloride

  • Ethyl chloride

  • Chlorobenzene

  • lsopropyl chloride


A.

Benzyl chloride

Among all the given options, benzyl chloride undergoes SN1 mechanism.

Aliphatic SN1 reaction is carried out in two steps:

(i) carbonium (carbocation) ion is formed and its formation is based upon the stability.

Stability order of carbocation- 

C6H52C+H2 > CH3C+H - CH3 > CH3C+H2

(ii) Nucleophile is attracted towards the carbonium ion in form of fast step to give final product.

Hence, in benzyl chloride, ethyl chloride and isopropyl chloride order of SN 1 reaction is benzyl chloride > isopropyl chloride > ethyl chloride


39.

The chirality of the compound

  • R

  • S

  • Z

  • E


A.

R

Lowest priority atom is always away from the viewer. Priority is seen on the basis of atomic number and if atomic numbers are same then on the basis of second or third bond in above figure priority order group or atom is -Br > -Cl > -CH3 > H and in it rotation is clockwise. So it shows R-configuration. 


40.

The main reason for larger number of oxidation states exhibited by the actinides than the corresponding lanthanides, is

  • lesser energy difference between 5f and 6d orbitals than between 4f and 5d orbitals

  • larger atomic size of actinides than the lanthanide

  • more energy difference between 5f and 6d orbitals than between 4f and 5d orbitals

  • greater reactive nature of the actinides than the lanthanides


A.

lesser energy difference between 5f and 6d orbitals than between 4f and 5d orbitals

The main reason for larger number of oxidation states exhibited by actinides than corresponding lanthanides is lesser energy difference between 5f and 6d orbitals than between 4f and 5d-orbitals.