Three alcohols
(i) `CH_3CH_2CH_2OH,`
(ii) `CH_3-CHOH-CH_3and`
(iii) `CH_3-C(CH_3)(OH)-CH_3`
were treated seperately with Lucas reagent (Conc. `HCl+ZnCl_2`) . What results do you expect at room temperature.

Options

A. (i) reacts is about 5 minutes , (ii) reacts in about 15 minutes and (ii) not at all
B. (iii) reacts immediately , (ii) reacts in about 5 minutes and (i) not at all
C. (ii) and (iii) react immediately and (i) in about 5 minutes
D. (i) reacts immediately , (ii) reacts in about 5 minutes and (iii) not at all

Answer

To solve the problem, we need to analyze the three alcohols provided and predict the results when they are treated with Lucas reagent (a mixture of concentrated HCl and ZnCl₂) at room temperature.

### Step-by-Step Solution:

1. **Identify the Types of Alcohols**:
- (i) `CH₃CH₂CH₂OH` is a primary alcohol (1°).
- (ii) `CH₃CHOHCH₃` is a secondary alcohol (2°).
- (iii) `CH₃C(CH₃)(OH)CH₃` is a tertiary alcohol (3°).

2. **Understand the Reaction with Lucas Reagent**:
- Lucas reagent reacts with alcohols to form alkyl halides. The reaction proceeds via the formation of a carbocation intermediate.
- The rate of reaction depends on the degree of alcohol:
- Primary alcohols react slowly and may require heating.
- Secondary alcohols react moderately.
- Tertiary alcohols react quickly at room temperature.

3. **Predict the Result for Each Alcohol**:
- **For Primary Alcohol (i)**:
- `CH₃CH₂CH₂OH` will react very slowly with Lucas reagent. At room temperature, no significant reaction will occur, and no cloudiness will be observed.
- **For Secondary Alcohol (ii)**:
- `CH₃CHOHCH₃` will react moderately with Lucas reagent. A cloudy solution will form after some time, indicating the formation of an alkyl halide.
- **For Tertiary Alcohol (iii)**:
- `CH₃C(CH₃)(OH)CH₃` will react quickly with Lucas reagent, leading to immediate cloudiness due to the rapid formation of the alkyl halide.

4. **Summarize the Expected Results**:
- (i) Primary alcohol: No reaction (no cloudiness).
- (ii) Secondary alcohol: Cloudiness observed after some time.
- (iii) Tertiary alcohol: Immediate cloudiness observed.

### Final Results:
- **Primary Alcohol (i)**: No cloudiness.
- **Secondary Alcohol (ii)**: Cloudiness after some time.
- **Tertiary Alcohol (iii)**: Immediate cloudiness.