The order of reactivity of following alcohols with halogen acids is _______.
`CH_3CH_2-CH_2-OH`
`CH_3CH_2-underset(CH_3)underset(|)"CH"-OH`
`CH_3CH_2-underset(CH_3)underset(|)overset(CH_3)overset(|)C-OH`

Options

A. `(A) gt (B) gt (C)`
B. `(C) gt (B) gt (A)`
C. `(B) gt (A) gt (C)`
D. `(A) gt (C) gt (B)`

Answer

B

Explanation

The reactivity of alcohols with halogen acids increases as the stability of the carbocation increases. `1^@ 2^@ and 3^@` carbocations are formed by alcohols A, B and C respectively. The order of stability of carbocations is `3^@ gt 2^@ gt 1^@`. Therefore, the order of reactivity of the given alcohols is (C) `gt` (B) `gt` (A).