Rank the following compounds in order of increasing basic strength. (weakest $\to$ strongest):

4 < 2 < 1 < 3

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4 < 3 < 1 < 2

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4 < 1 < 3 < 2

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2 < 1 < 3 < 4

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Solution

The correct option is B $4 < 3 < 1 < 2$
Solution:- (B) $4 < 3 < 1 < 2$
The order of basic strength in amine and amide is-
Aliphatic amine $>$ Aromatic amine $>$ amide
$- N O_{2}$ group will exert its electron withdrawing resonance effect and thus will decrease the basic strength.
Thus the order of basic strength in the given compound is-
$P h - O | | C - N H_{2} < C_{6} H_{4} (N H_{4}) (N O_{2}) < P h - N H_{2} < P h - C H_{2} - N H_{2}$

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