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Q.

With respect to the compounds I-V, choose the correct statement(s).

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a

The conjugate base of compound IV is aromatic. 

b

The acidity of compounds follows the order I > IV > V > II > III

c

The acidity of compound I is due to delocalization in the conjugate base

d

Compound II becomes more acidic, when it has a -NO2 substituent. 

answer is A, B, C.

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Detailed Solution

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(C) –NO2 is –I group (electron withdrawing group). It increases acid strength.
(D) Acid strength order : IV > V > I > II > II

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