The major products $P$ and $Q$ are

List-$I$ contains various reaction sequences and List-$II$ contains different phenolic compounds. Match each entry in List-$I$ with the appropriate entry in List-$II$ and choose the correct option.

Match the reaction in Column-$I$ with the mechanism in Column-$II$.

Column-$I$ (Reaction)	Column-$II$ (Mechanism)
$A$. $CH_3OCH_2CH_3 + HI \to CH_3I + CH_3CH_2OH$	$i$. $S_{E}2$ Aromatic
$B$. $(CH_3)_3COCH_3 + HI \to CH_3OH + (CH_3)_3CI$	$ii$. $S_{N}1$
$C$. $C_6H_5OCH_3 + Br_2(CH_3COOH) \to p$-Bromoanisole	$iii$. Elimination $(\beta)$
$D$. $CH_3CH_2OH + H_2SO_4 (443 \ K) \to CH_2=CH_2$	$iv$. $S_{N}2$

Which of the following compounds will undergo a Friedel-Crafts alkylation reaction?

In the given reaction sequence,identify the correct reagents to prepare $A$ from $B$. The starting material is benzenesulfonic acid. The reaction with $\Delta / H_3O^+$ yields $B$ (benzene),and the reaction with $1. \text{Fused } NaOH, 2. H^+$ yields $A$ (phenol). Therefore,to prepare $A$ (phenol) from $B$ (benzene),the correct sequence of reagents is:

Ethanol and phenol cannot be distinguished by