Acetic anhydride reacts with diethyl ether in the presence of anhydrous $AlCl_3$ to form:

Which of the following does not contain an acyl group?

Diethyl ether finds use in medicine as

Assertion: Ethyl phenyl ether on reaction with $HBr$ forms phenol and ethyl bromide.
Reason: Cleavage of $C-O$ bond takes place at the ethyl-oxygen bond due to the more stable phenyl-oxygen bond.

Identify the missing reagent in the following reaction: $C_6H_5OCH_3 + (?) \rightarrow \text{p-methoxyacetophenone (major)} + \text{o-methoxyacetophenone (minor)}$

Identify $A$ and $B$ in the following reaction: $C_6H_5CH_2-O-C_6H_5 + HI \rightarrow A + B$