Alcohols (i) `CH_(3)CH_(2)CH_(2)OH, (ii) CH_(3)-CHOH-CH_(3)` and `(iii) CH_(3)-C(CH_(3))(OH)-CH_(3)` were treated with Lucas reagent (Conc. `HCl+ZnCl_(2)`). What results do you expect at room temperature

Options

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

Answer

To analyze the behavior of the given alcohols when treated with Lucas reagent (concentrated HCl + ZnCl₂), we need to understand the reactivity of primary, secondary, and tertiary alcohols with this reagent.

### Step-by-Step Solution:

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

2. **Understand the Reactivity with Lucas Reagent:**
- Lucas reagent is used to differentiate between primary, secondary, and tertiary alcohols.
- Tertiary alcohols react quickly (within minutes) to form alkyl chlorides.
- Secondary alcohols react more slowly (within 5-10 minutes).
- Primary alcohols do not react significantly at room temperature and may take a long time (30 minutes to an hour) to show any reaction.

3. **Predict the Results:**
- For the primary alcohol (i), `CH₃CH₂CH₂OH`:
- **Expected Result:** No reaction at room temperature.
- For the secondary alcohol (ii), `CH₃-CHOH-CH₃`:
- **Expected Result:** Reaction occurs, but it may take around 5-10 minutes to form the corresponding alkyl chloride.
- For the tertiary alcohol (iii), `CH₃-C(CH₃)(OH)-CH₃`:
- **Expected Result:** Rapid reaction occurs, forming the corresponding alkyl chloride almost immediately.

4. **Summarize the Results:**
- (i) Primary alcohol: No reaction.
- (ii) Secondary alcohol: Slow reaction (5-10 minutes).
- (iii) Tertiary alcohol: Fast reaction (immediate).

### Final Answer:
- **Primary Alcohol (i):** No reaction at room temperature.
- **Secondary Alcohol (ii):** Reaction occurs in about 5-10 minutes.
- **Tertiary Alcohol (iii):** Reaction occurs immediately.