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Question

A comppound of molecular wight 180 is acetylated to give a compound of molecular weight 390. The number of Alcoholic groups in the compound is:

A
6
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B
5
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C
4
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D
3
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Solution

The correct option is B 5
Acetylation of an alcohol takes place in the following manner:
ROHAcetylationROAc
Thus, it is clear that each OH group is replaced by a OAc group. Now, the weight of an acetyl group (Ac) is 43 and the weight of the lost Hydrogen atom is 1. Upon completion of reaction, for each OH group present in a molecule, there is an increase of 431=42 units of weight.
Now, net increase in weight of the given molecule (390180)=210
Thus, total number of OH groups in the original molecule is 21042=5
Hence, Option B is the correct answer.

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