Which of the following is most reactive alcohol for its reaction with HCl ?
(a) `(CH_(3))_(3)COH` (b) `(CH_(3))_(2)CHCH_(2)OH` (c) `CH_(3)underset(OH)underset(|)CHCH_(3)`

Explanation

To determine which alcohol is the most reactive with hydrochloric acid (HCl), we need to analyze the stability of the carbocations formed during the reaction. The reactivity of alcohols with HCl is influenced by the stability of the carbocation that is generated when the -OH group is protonated and leaves as water.

### Step-by-Step Solution:

1. **Identify the Structures of the Alcohols**:
- (a) `(CH₃)₃COH` - This is tert-butanol, a tertiary alcohol.
- (b) `(CH₃)₂CHCH₂OH` - This is isobutanol, a secondary alcohol.
- (c) `CH₃CH(OH)CH₃` - This is isopropanol, also a secondary alcohol.
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