Arrange the following amines in increasing order of basicity: (A) CH_3CH_2NH_2, (B) Diethylamine, (C) Trimethylamine, (D) N-methyl aniline (Ph–NH–CH₃)

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EEJ MAIN Chemistry QUESTION #5574

Question 1

Arrange the following amines in increasing order of basicity: (A) $CH_3CH_2NH_2$, (B) Diethylamine, (C) Trimethylamine, (D) $N$-methyl aniline (Ph–NH–CH₃)

(D) < (C) < (B) < (A)
(D) < (C) < (A) < (B)✔️
(A) < (B) < (C) < (D)
(A) < (B) < (D) < (C)

Correct Answer Explanation

In aqueous solution, basicity order for aliphatic amines: secondary > primary > tertiary (due to solvation). Aromatic amine (D) has lone pair delocalized into benzene ring → least basic. Order: (D) < (C) < (A) < (B). Trimethylamine (C) is tertiary and less basic than primary (A) in aqueous medium due to steric hindrance to solvation.

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