JEE Main & Advanced
Sample Paper
JEE Main - Mock Test - 29
question_answer
Give the decreasing order of \[{{K}_{a}}\] value of the following compounds.
(I)
(II)
(III)
(IV)
A)\[I>IV>III>II\]
B) \[II>III>IV>I\]
C)\[I>III>II>IV\]
D) \[I>IV>II>III\]
Correct Answer:
A
Solution :
[a]
Therefore, the order of acidic character: Aromatic > Non-aromatic > Anti-aromatic. But anti-aromaticity of (III) is more than (II) since (III) is more resonance stabilised than (II). Therefore, the order of decreasing acidic character or \[{{K}_{a}}\]value is (I) > (IV) > (III) > (II)