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In nucleophilic substitution reactions,alkyl halides are more reactive than aryl halides because...

Chlorobenzene reacts with bromine gas in the presence of $Anhyd. AlBr_3$ to yield $p-$Bromochlorobenzene. This reaction is classified as . . . . . .

Assertion : $S_{N}2$ reaction of an optically active aryl halide with an aqueous solution of $KOH$ always gives an alcohol with opposite sign of rotation.
Reason : $S_{N}2$ reactions always proceed with retention of configuration.

Which of the following reactions is used to prepare toluene from bromobenzene?

What are $A$ $\&$ $B$ in the following reaction?
$m-Br-C_6H_4-Cl$ $\xrightarrow{Mg/THF} A$ $\xrightarrow[(ii) \ aq. NH_4Cl]{(i) \ CH_3CHO} B$

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