The correct order of boiling points of the following amines $C_{4} H_{9} {N H}_{2}, {(C_{2} H_{5})}_{2} N H, C_{2} H_{5} N {({C H}_{3})}_{2}$ is :

C_{2} H_{5} N {({C H}_{3})}_{2} > {(C_{2} H_{5})}_{2} N H > C_{4} H_{9} {N H}_{2}

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{(C_{2} H_{5})}_{2} N H > C_{2} H_{5} N {({C H}_{3})}_{2} > C_{4} H_{9} {N H}_{2}

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C_{4} H_{9} {N H}_{2} > {(C_{2} H_{5})}_{2} N H > C_{2} H_{5} N {({C H}_{3})}_{2}

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{(C_{2} H_{5})}_{2} N H > C_{4} H_{9} {N H}_{2} > C_{2} H_{5} N {({C H}_{3})}_{2}

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Solution

The correct option is D $C_{4} H_{9} {N H}_{2} > {(C_{2} H_{5})}_{2} N H > C_{2} H_{5} N {({C H}_{3})}_{2}$
Because $C_{4} H_{9} {N H}_{2}$ is primary amine and can form hydrogen bonding more than secondary amine $(C_{2} H_{5})_{2} N H$ and tertiary amine $C_{2} H_{5} N {({C H}_{3})}_{2}$ .More hydrogen bonding leads to strong bonding between the molecules, hence increases the boiling point.

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