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Q.

Melting points are normally the highest for 

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a

Tertiary amides 

b

Secondary amides

c

Primary amides 

d

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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