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CH(3) - CH(2) - CH(2) - CH(3) overset(Al...

`CH_(3) - CH_(2) - CH_(2) - CH_(3) overset(AlCl_3) underset(HBr) rarr ` Product. Product in above reaction is

A

`CH_(3) - underset(Br) underset(|)CH-CH_(2) - CH_(3)`

B

`CH_(3) - underset(CH_3)underset(|)CH - CH_(3)`

C

`underset(Br)underset(|)(CH_2)-CH_(2) - underset(CH_3)underset(|)CH_(2)`

D

All of these

Text Solution

Verified by Experts

The correct Answer is:
B
`CH_(3)-CH_(2) - CH_(2)-CH_(3) overset(AlCl_3)underset(HBr) rarr CH_(3) - underset(CH_3)underset(|)(CH)_CH_(3)`
Method I :
Mechanism :
Initiation : It probably begins by the protonation of butene impurities

The Lewis acid, `AlCl_3` stabilizes the bromide ion from HBr when the H is used to protonate the butene. A secondary carbocation is formed, which undergoes methyl shift to form a primary carbocation.

An alkane attacks the carbocation and supplies a hydride to the carbocation to complete the carbocation. Meanwhile, another carbocation is formed which also undergoes methyl shift to regenerate the carbocation at the beginning of this step

Method II
In isomerisation  n alkanes on heating in the presence of anhydrous `AlCl_3` and HBr gas Bomerise to branched chain alkanes.
Hence, the answer is ''b''
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