Name the lowest molecular weight alcohol which is optically active.

Explanation

To determine the lowest molecular weight alcohol that is optically active, we need to follow these steps:

### Step 1: Understand Optical Activity
Optically active compounds are those that can rotate plane-polarized light. This property arises from the presence of chiral centers in the molecule. A chiral center is typically a carbon atom that is bonded to four different groups.

**Hint:** Look for compounds with chiral centers, as they are the key to optical activity.

### Step 2: Identify Alcohols
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