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Q.
Which one of the following alkenes will react fastest with $H_2$
under catalytic hydrogenation condition ?
IIT JEEIIT JEE 2000Hydrocarbons
Solution:
Ease of catalytic hydrogenation depends upon the size of groups
present at the doubly bonded carbon. Larger the size of groups,
difficult the hydrogenation. Therefore, in the given situation,
disubstituted reacts at faster rate than tri and tetra substituted
alkenes. Among disubstituted, the stability order is :
cis < geminal < trans.