81.

Observe the following reactions and predict the nature of A and B:

• A and B both are 

• A and B both are 

• A is  and B is 

• A is  and B is 

Nitration of aniline in strongly acidic medium, result in the formation of m-nitroaniline also. This is because :

• amino group is meta orienting during electrophilic substitution reaction

• nitro group goes always to the meta position irrespective of the substituents

• nitration of aniline is a nucleophilic substitution reaction in strongly acidic medium

• in strongly acidic conditions aniline is present as anilinium ion

How many σ and Π bonds are present in toluene?

• 3Π + 8σ

• 3Π + 10σ

• 3Π + 15σ

• 6Π + 3σ

Propyne when passed through a hot iron tube at 400°C produces :

• benzene

• methyl benzene

• dimethyl benzene

• trimethyl benzene

The name of the compound fig is:

• (2Z, 4Z)-2, 4-hexadiene

• (2Z, 4E)-2, 4-hexadiene

• (2E, 4Z)-2, 4-hexadiene

• ( 4E, 4Z)-2, 4-hexadiene

The carbide which reacts with water to form ethyne is:

• CaC₂

• SiC

• Mg₂C₃

• Al₄C₄

Three fused benzene rings are found in:

• naphthalene

• anthracene

• phenanthroline

• triphenyl methane

The following reaction represent,

C₁₂H₂₆ → C₆H₁₂ + C₆H₁₄

• substitution

• synthesis

• cracking

• polymerization

Order of reactivity of C₂H₆, C₂H₄ and C₂H₂ is 

• C₂H₆ > C₂H₄ > C₂H₂

• C₂H₂ > C₂H₆ > C₂H₄ 

• C₂H₄ > C₂H₂ > C₂H₆ 

• All are equally reactive.

In Wurtz reaction alkyl halide react with

• sodium in ether

• sodium in dry ether

• sodium only

• alkyl halide in ether