Among a set of variously substituted alkenes (ranging from a terminal, less-hindered R_2C=CH_2 to more hindered internal R–CH=CH–R structures), catalytic hydrogenation is easiest for

JEE Main Chemistry question

Among a set of variously substituted alkenes (ranging from a terminal, less-hindered RC=CH to more hindered internal R–CH=CH–R structures), catalytic hydrogenation is easiest for

(A)The terminal, least sterically hindered alkene, RC=CHCorrect
(B)An internal *cis*-disubstituted alkene
(C)An internal *trans*-disubstituted alkene
(D)A tetrasubstituted internal alkene

Answer: (A)

Solution

Catalytic (heterogeneous) hydrogenation requires the alkene to adsorb onto the catalyst surface; a less hindered, terminal double

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Question ID VK-142824