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Acidity of Carboxylic Acids

The order of ...

Question

The order of acidity of the $H -$ atoms underlined in the following compounds is in the order:
(I) $P h - C H_{2} - C H_{3}$
(II) $P h - C H = C H - C H_{3}$
(III) $P h - C H = C H_{2}$
(IV) Refer image

IV>II>I>III

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II>IV>III>I

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II>IV>I>IIII

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I>III>II>IV

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Solution

The correct option is A IV>II>I>III
Since $H^{+}$ is involed in conjugation, the $H^{+}$ here is highly acidic.
$P h - C H = C H - C H_{3}$ Here also the double bond is in conjugation making it more acidic.
$P H - C H_{2} - C H_{3}$ No conjugation less acidic.
Hence, order of Acidity is
(Refer to Image) $> P h - C H = C H - C H_{3} > P H - C H_{2} - C H_{3} > P h - C H = C H_{2}$

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