JEE Main Chemistry question

+ NaOH

How can this reaction be made to proceed in the forward direction? [IIT JEE 2006]

(A)Addition of cis-1,2-diolCorrect
(B)Addition of borax
(C)Addition of trans-1,2-diol
(D)Addition of

Answer: (A)

Solution

A cis-1,2-diol (e.g. glycerol, cis-1,2-cyclohexanediol) can chelate with the tetrahydroxyborate ion to form a stable cyclic diolato-borate complex; removing in this way shifts the equilibrium forward by

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Question ID VK-138213