Melting points are normally the highest for 

  1. A

    Tertiary amides 

  2. B

    Secondary amides

  3. C

    Primary amides 

  4. D

    Amines

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    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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