Chapter 13: Amines

Ans: (c)

In the acryl derivative, the delocalisation of electrons of the nitrogen atom occur over the carbonyl group, this decreases the electron density on the the nitrogen atom that it no more perform as nucleophile and don’t react with next acylating alkaline molecule. 

Therefore, Assertion statement is correct but reason is incorrect. 

Ans: (a)

In Hoffmann bromamide degradation reaction as in this reaction primary amide group is treated with halogen first bromine then the halogen substituted amide product is coverts to primary amine with the release of carbon dioxide gas. Both the statements assertion and reason are incorrect therefore the correct option is a. 

Ans: (d)

Ethylbenzene sulphonamide is soluble in alkali because it has acidic hydrogen.

Ans: (b)

N, N-die ethyl benzene sulphonamide, there is no acidic hydrogen present on the N-atom which can make it soluble. Therefore, it is insoluble in alkali. 

Ans: (d)

$\mathrm{Fe}+2 \mathrm{HCl} \rightarrow \mathrm{FeCl}_{2}+2[\mathrm{H}]$ $\mathrm{FeCl}_{2}+\mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \rightarrow \mathrm{FeO}+2 \mathrm{HCl}$

The nascent hydrogen formed act as reducing agent for the reduction of nitro compounds.

Ans: (a)

Aromatic primary amines cannot be prepared using Gabriel phthalimide synthesis as aryl halides do not undergo nucleophilic substitution with anion formed by phthalimide. Both the statement's assertion and reason are incorrect, hence the correct answer is a.

Ans: (d) 

Acetanilide is less basic than aniline because electron density of nitrogen is lowered by acetyl group.