HydrocarbonsHard
Question
Which one of the following alkenes will react fastest with H2 under catalytic hydrogenation condition ?
Options
A.
B.
C.
D.
Solution
The rate of hysrogenation of double bond at form. temperature is in the order
R - CH = CH2 > R - CH = CH - R or a ring double bond.
Alkenes of type R2C = CR2 or R2CH = CHR is hydrogenated with difficulty .Thus reactivity order is :
(a) RCH = CH2 (b) R2C = CH2
(1) (2)
(c) R2C = CHR (d) R2C = CR2
(3) (4)
R - CH = CH2 > R - CH = CH - R or a ring double bond.
Alkenes of type R2C = CR2 or R2CH = CHR is hydrogenated with difficulty .Thus reactivity order is :
(a) RCH = CH2 (b) R2C = CH2
(1) (2)
(c) R2C = CHR (d) R2C = CR2
(3) (4)
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