The increasing order of basic strength for the following compounds is:
(I) $C H_{3} - C H_{2} - N H_{2}$
(II) $C H_{3} - N H - C H_{3}$
(III) $C H_{3} - N H - P h$
(IV) $C H_{3} - N H - C H O$

I V < I I I < I > I I

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I I I < I V < I > I I

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I V < I I I < I I > I

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I I < I < I I I > I V

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Solution

The correct option is C $I V < I I I < I I > I$
Aliphatic amines are stronger bases than ammonia and aromatic amines are weaker bases than $N H_{3}$ and $3 ° > 2 ° > 1 ° \to$ basic strength in a gaseous phase.

Thus, the increasing order of basic strength from the options can be
$I V < I I I < I I > I$

$I I, I I I, I V$ are secondary amines. $I I I$ is aromatic, hence is less basic than $I I, I V$ . The lone pair of amine resonates with the $- C H O$ bond, hence it cannot be freely available, thus it is less basic.

Option C is correct.

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