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  4. Give the decreasing order of Ka value of the following compounds

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Q. Give the decreasing order of $K_a$ value of the following compoundsChemistry Question Image

Haloalkanes and Haloarenes

Solution:

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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)