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Question
Which of the following alkenes will react faster with H2 under catalytic hydrogenation conditions?
Which of the following alkenes will react faster with H2 under catalytic hydrogenation conditions?
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Solution
The correct option is A
Alkane is prepared by catalytic hydrogenation of alkene/alkyne on addition of H2 with catalyst Ni/Pt/Pd.
Thus, bulky substituent in alkene (b) and (c) will reduce the rate of hydrogenation due to crowding.
The catalytic hydrogenation is syn addition by forming a four membered transition state There will be more crowding for addition of H to the same side in (d).
Therefore, option (a) is correct.
Alkane is prepared by catalytic hydrogenation of alkene/alkyne on addition of H2 with catalyst Ni/Pt/Pd.
Thus, bulky substituent in alkene (b) and (c) will reduce the rate of hydrogenation due to crowding.
The catalytic hydrogenation is syn addition by forming a four membered transition state There will be more crowding for addition of H to the same side in (d).
Therefore, option (a) is correct.
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