JEE Main Chemistry question

(*syn*-dihydroxylation of a *cis*-disubstituted alkene with an internal element of symmetry). is [BITSAT 2005]

(A)*meso* diolCorrect
(B)Racemic diol
(C)Both (A) and (B)
(D)None of these

Answer: (A)

Solution

OsO/HO effects *syn*-dihydroxylation: both new OH groups are delivered to the same face of the double bond. For a *cis*-alkene possessing an internal mirror symmetry between its two halves,

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Question ID VK-142223