The order of acidic strengths of the following carboxylic acids is
i) $C H_{3} - C H_{2} - C O O H$
ii) $C H_{3} - C O O H$
iii) $C_{6} H_{5} - C O O H$
iv) $C_{6} H_{4} - C H_{2} C O O H$

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(iii)>(ii)>(iv)>(i)

(iv)>(ii)>(iii)>(i)

(i)>(iv)>(ii)>(iii)

(iii)>(iv)>(ii)>(i)

answer is A.

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Detailed Solution

I) $C H_{3} - C H_{2} - C O O H$

II) $C H_{3} - C O O H$

III) $C_{6} H_{5} - C O O H$

IV) $C_{6} H_{4} - C H_{2} - C O O H$

Due to –I effect (iii) is most acidic, followed by iv and for aliphatic carboxylic acid as carbon chain increase acidic nature decreases

order will be (iii) > (iv) > (ii) > (i)

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