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Question

The decreasing order of boiling points of the following is :
(I) RCOCl, (II) (RCO)2O, (III) RCONH2, (IV) RCOOH

A
I > IV > II > III
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B
III > II > IV > I
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C
IV > III > I > II
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D
II > I > III > IV
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Solution

The correct option is B III > II > IV > I
The decreasing order of boiling points of the following is III.RCONH2>II.(RCO)2O>IV.RCOOH>I.RCOCl
Acid chlorides have least boiling point as hydrogen bonding is not possible.
Amides have high boiling point as two H atoms per amide group can participate in hydrogen bonding.

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