Identify the correct statement among the following. (a) n, n-dimethylaniline reacts with nitrous

step 1 As we know that, aromatic, cursory amines react with amines react with nitrous acid to give P ni

Identify the correct statement among the following. (a) n,...

Identify the correct statement among the following. (a) $\mathrm{n}, \mathrm{n}$-dimethylaniline reacts with nitrous acid to give p-nitroso-N,N-dimethyl aniline (b) bromination of p-toluidine produces 3,5 -dibromo, 4-methylaniline (c) aliphatic amines are less basic than ammonia (d) aliphatic primary amines combine with nitrous acid under ice-cold conditions to form stable diazonium salts

Identify the correct statement among the following.
(a) $\mathrm{n}, \mathrm{n}$-dimethylaniline reacts with nitrous acid to give p-nitroso-N,N-dimethyl aniline
(b) bromination of p-toluidine produces 3,5 -dibromo, 4-methylaniline
(c) aliphatic amines are less basic than ammonia
(d) aliphatic primary amines combine with nitrous acid under ice-cold conditions to form stable diazonium salts

Key Concepts

Electrophilic Aromatic Substitution

This reaction mechanism involves an aromatic ring reacting with an electrophile. In the process, the aromaticity is temporarily lost as a sigma complex is formed, and then restored after deprotonation. The nature and position of substituents on the ring greatly influence both the reactivity and regioselectivity of the substitution.

Nitrosation Reaction

Nitrosation refers to the introduction of a nitroso group into an organic molecule, typically using nitrous acid. In aromatic systems, especially those with tertiary amines, the reaction can proceed via electrophilic aromatic substitution leading to nitroso derivatives, rather than forming diazonium salts as is common with primary aromatic amines.

Diazotization and Diazonium Salt Stability

Diazotization is the conversion of aromatic amines into diazonium salts using nitrous acid under cold conditions. These salts are generally stable when attached to aromatic systems but are unstable in aliphatic amines, leading to rapid decomposition and formation of other products.

Basicity Trends in Amines

The basicity of amines is influenced by the substituents attached to the nitrogen. Alkyl groups are electron-donating, generally making aliphatic amines more basic than ammonia. The nature of these substituents and the ability to stabilize the positive charge upon protonation play crucial roles in determining overall basicity.

Bromination Reactions of Aromatic Amines

Bromination involves the substitution of one or more hydrogen atoms on an aromatic ring with bromine. The presence of activating groups such as amino or alkyl groups can enhance the reactivity and guide the substitution pattern (ortho/para directing), although under certain conditions or with unprotected functionalities, unexpected substitution patterns or multiple brominations can occur.

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