The decreasing order of boiling points of the following is :
(I) $R C O C l$ , (II) ${(R C O)}_{2} O$ , (III) $R C O N H_{2}$ , (IV) $R C O O H$

I > IV > II > III

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III > II > IV > I

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IV > III > I > II

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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 $I I I . R C O N H_{2} > I I . {(R C O)}_{2} O > I V . R C O O H > I . R C O C l$
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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