Which of the following is least basic?

(C H_{3} C O)_{2} N H

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(C H_{3} C O) N H C_{2} H_{5}

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(C_{2} H_{5})_{2} N H

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(C_{2} H_{5})_{3} N

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Solution

The correct option is A $(C H_{3} C O)_{2} N H$

The lone pair on N is delocalised on both the carbonyls.
Due to higher resonance, lp of N is not available for accepting $H^{+}$ .
So, it is least basic.

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