Ncert Exercises & Solutions

Which of the following should be most volatile?

I.	\(\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{NH}_2\)
II.	\(\left(\mathrm{CH}_3\right)_3 \mathrm{~N}\)
III.
IV.	\(\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_3\)

1.	II	2.	IV
3.	I	4.	III

HINT: H-bonding is the strong intermolecular force

EXPLAINATION(2) -1^o and 2^o amines have higher boiling points due to intermolecular H-bonding but less volatile than amines and hydrocarbons of comparable molecular mass. Further, because of polar C-N bonds, 3^o amines are more polar than hydrocarbons which are almost non-polar. Hence. due to weak dipole-dipole interactions, 3^o amines have a higher boiling point (i.e., less volatile) than hydrocarbons.

In other words, hydrocarbons are more volatile among given compounds as amine are Less volatile than hydrocarbon.

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