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Inductive Effect

Decreasing or...

Question

Decreasing order of acidic strength of following compounds is:

A

x > y > z

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B

y > x > z

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C

z > y > x

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D

z > x > y

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Solution

The correct option is C $z > x > y$
Above will be the anions formed, after the removal of proton. Out of these $y^{'}$ will be unstable as it is anti-aromatic ring, ionization of $y$ to $y^{'}$ will not be favored. $z^{'}$ will be the most stable as it is aromatic ring and the negative charge is stabilized by $- (n)$ group through $- I$ effect. $x^{'}$ also will be stable due to aromatic nature of the ring but will be less stable than $z^{'}$ .
Hence, the order of acidic strength is- $z > x > y$

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