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

Options

A. The acidity of compound I is due to delocalization in the conjugate base.
B. The conjugate base of compound IV is aromatic
C. Compound II becomes more acidic, when it has a `-NO_(2)` substitutent.
D. The acidity of compounds follows the order `I gt IV gt V gt II gt III.`

Answer

A, B, C

Explanation

is stabilised by conjugation
(B) Conjugate base of which is an aromatic anion
`(-NO_(2))` group is an electron withdrawing group it increases acidic strength of any compound to which it is added.
(D) The acidic strength order on the basis of `pK_(a)` data is `IV gt V gt I gt II gt III`