Melting points are normally the highest for

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Tertiary amides

Secondary amides

Primary amides

Amines

answer is C.

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Detailed Solution

The higher boiling points of amides is because of Intermolecular hydrogen bonding
Due to intermolecular hydrogen bonding, they have high boiling point than amine and amongst amide, the order of boiling points are Primary > Sec > Tertiary
This is because of alkyl group by which, the carbonyl oxygen does not form the hydrogen bond (with other molecules)
So, primary amide has high boiling point and tertiary amides do not have to form a bond with other amides and have least B.P.

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