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Addition of HX on alkene proceed through...

Addition of HX on alkene proceed through formation of carbocation . This reaction is follows Markovnikov's rule. According to markovnikov's rule addition of electrophile occurs on that carbon of alkene which have more number of -H atom
`Ph-CH = CH_2 underset(HX)to underset("(major)")(Ph-overset(x)overset(|)CH-CH_3) + underset("(minor)")(Ph-CH_2-CH_2-X)`
Arrange the following alkenes in decreasing order of reaction with HBr.

A

`P gt Q gt R gt S `

B

`R gt Q gt P gt S`

C

`S gt R gt Q gt P`

D

`Q gt R gt P gt S`

Text Solution

Verified by Experts

The correct Answer is:
B
Stability of intermediate carbocation given in the following



N.atom is less electro negative. So loan pair of nitrogen atom participating in resonance then oxygen atoms so 1 is more stable than 2, 4 is less table because of -I effect of `-OCH_3`
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