A polyhydroxy alcohol having molecular weight =168. On acetylation the molecular weight increases to 294. Determine the number of -OH groups present in the alcohol.

Explanation

To determine the number of -OH groups present in the polyhydroxy alcohol, we can follow these steps:

### Step 1: Understand the molecular weight changes
We are given that the molecular weight of the polyhydroxy alcohol is 168 g/mol. After acetylation, the molecular weight increases to 294 g/mol.

### Step 2: Calculate the change in molecular weight
To find the increase in molecular weight due to acetylation, we subtract the initial molecular weight from the final molecular weight:
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