Arrange the following in the decreasing order of basic strength in gaseous phase:
(i) $C_{2} H_{5} N H_{2}$ , (ii) $(C_{2} H_{5})_{3} N, (i i i) (C_{2} H_{5})_{2} N H$

i > ii > iii

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ii > iii > i

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iii > i > ii

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iii > ii > i

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Solution

The correct option is A ii > iii > i
The decreasing order of basic strength in gaseous phase is $(C_{2} H_{5})_{3} N > (C_{2} H_{5})_{2} N H > C_{2} H_{5} N H_{2}$ .

The $+ I$ effect of alkyl groups increases electron density on N atom and thus also the basic character of amine.

Thus greater is the number of alkyl groups, greater is the basicity.

Option B is correct.

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