1.

Match the column

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Solution :(A). It is a mercuration demercuration REACTION, FORMATION of alcohol TAKES place according to mark-ovnikov's rule. The first step of this reaction addition of electrophile `AcOoverset(o+)(H)g` to `(C=C)` bond to form mercurinium ions, is stereospecific, but the second step, addition of `H^(+)` from `NaBH_(4)`, is not clearly stereospecific. so, OVERALL the reaction is non-stereospecific.
(B). It is an alkoxy mercuratio demercuration reaction, which proceeds with a similar mechanisms as i (A)
(C). It is hydroboration oxidation (HBO) reaction. the formatio of alcohol takes place with anti markovnikov's rule with syn-addition. the overall reaction is stereospecific.
(D). It is also an `HBO` REACTIO involving the formation of cis-alkene and proceeds with the similar mechanisms as in (C).


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