Question

An alcohol X ($\text{C}_5\text{H}_{12}\text{O}$) produces turbidity instantly with conc. $\text{HCl}/\text{ZnCl}_2$. Isomer (Y) of $\text{X}$ undergoes dehydration with conc. $\text{H}_2\text{SO}_4$ at $443 \text{ K}$. $\text{X}$ and $\text{Y}$ respectively are

• A. $\text{Structure 1}, \text{Structure 2}$
• B. $\text{Structure 2}, \text{Structure 1}$
• C. $\text{Structure 3}, \text{Structure 4}$
• D. $\text{Structure 4}, \text{Structure 3}$

Hint:

The Lucas test ($\text{HCl}/\text{ZnCl}_2$) is used to distinguish between primary, secondary, and tertiary alcohols. The reactivity order is $3^\circ$ (instant turbidity) $> 2^\circ$ (turbidity in 5-10 min) $>1^\circ$ (no turbidity). Dehydration temperature follows the reverse order ($1^\circ$ highest, $3^\circ$ lowest).

Answer 1

The Correct Option is B