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  4. The correct order of boiling point of ethyl dimethyl amine , n-butyl amine and diethyl amineis

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Q. The correct order of boiling point of ethyl dimethyl amine , n-butyl amine and diethyl amineis

VMMC MedicalVMMC Medical 2012

Solution:

Among $1^{\circ}, 2^{\circ}$ and $3^{\circ}$ amines, the primary amine has the maximum strength to form the $H$ bond. The dipole-dipole attraction force also works between these molecules, hence the boiling point of primary amine is maximum. Between $2^{\circ}$ and $3^{\circ}$ amine, the tertiary amines does not from $H$-bond while secondary amine has some strength to form bond. $H$ - bond. Hence, the order of boiling point is as
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