Suitable reaction condition for preparation of Methyl phenyl ether is:

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Given: We need the suitable reaction condition for preparation of methyl phenyl ether.

Find: Which reagent pair gives $\text{Ph-O-Me}$ by Williamson ether synthesis.

The Williamson ether synthesis involves reaction of an alkoxide or aryloxide ion with a primary alkyl halide.

\text{R-O}^- + \text{R'-X} \rightarrow \text{R-O-R'} + \text{X}^-

For methyl phenyl ether, the required nucleophile is phenoxide ion and the alkyl halide must provide the methyl group.

\text{PhO}^-\text{Na}^+ + \text{MeBr} \rightarrow \text{Ph-O-Me} + \text{NaBr}

The phenoxide ion acts as a nucleophile in an $\text{SN}_2$ reaction and attacks methyl bromide to form the ether linkage.

Therefore, the correct option is D.

Note: the solution incorrectly labels the correct option as A, but its own reaction and explanation clearly support $\text{PhO}^-\text{Na}^+$ with MeBr, which is option D.

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