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Question

Arrange the above in the decreasing order of reactivity towards HBr :
990358_05ed79121f9247aaac494e101d101d77.png

A
a > b > c
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B
b > a > c
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C
b > c > a
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D
a > c > b
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Solution

The correct option is A b > a > c
Among a,b and c electron donating ability order is OCH3>CH3>CH2OCH3 more the electron donating ability of substituent more is the stability of carbocation.So, thee correct answer will be b>a>c.

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