Hydrocarbons - Result Question 43
26. Which one of the following alkenes will react fastest with $H _2$ under catalytic hydrogenation condition?
(2000, 1 M)
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Answer:
Correct Answer: 26. (a)
Solution:
Ease of catalytic hydrogenation depends upon the size of groups present at the doubly bonded carbon. Smaller the size of groups, easier the hydrogenation. Therefore, in the given situation, disubstituted reacts at faster rate than tri and tetra substituted alkenes. Among disubstituted, the stability order is :
$ \text { cis }<\text { trans }<\text { geminal } $
BETA
