Q. Increasing order of acidic strength among
p-methoxy phenol (I), p-methyl phenol (II)
and p-nitrophenol (III) is

 3877  187 AIPMTAIPMT 1992 Report Error

Solution:

Nitro group is an electron withdrawing group, so
increase the acidic character of phenol whereas
and both are electron releasing
groups, so it decrease the acidic character of phenol
but group is less electron donating or
releasing, so p-methyl phenol is slightly more acidic
than p-methoxy phenol and p-nitro phenol is most
acidic, so the order of acidic character is
p-methoxy phenol < p-methyl phenol
< p-nitro phenol.

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