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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)


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