Question

please anyone make me understand​

Answer 1

Answer:

c) III > IV > I > II

Para-nitro phenol is most acidic due to -R activity, as Phenol is activating in nature when -R group present in ortho-para position. Then, meta nitro phenol as it shows -I behaviour at meta position and it is also activating. Then, normal phenol. Least is the para methoxy phenol as it shows +R activity in para position, which is deactivating for phenol. Also, -R is dominant over-I , so Para nitro phenol is most acidic.

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