Which among the following represents the correct decreasing order of acidic strength for the following compounds?

I > I I > I I I > I V

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I I > I I I > I > I V

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I V > I I I > I > I I

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I I I > I I > I V > I

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Solution

The correct option is B $I I > I I I > I > I V$
(II) is the most acidic due to ortho effect.
(IV) is least acidic since +R effect of $O H$ group is more pronounced over its -I effect.
(III) is more acidic than (I) as -I effect of $O H$ stabilised the conjugate base.

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Which among the following represents the correct decreasing order of acidic strength for the following compounds?

The correct option is B II>III>I>IV(II) is the most acidic due to ortho effect. (IV) is least acidic since +R effect of OH group is more pronounced over its -I effect. (III) is more acidic than (I) as -I effect of OH stabilised the conjugate base.

The correct option is B $I I > I I I > I > I V$
(II) is the most acidic due to ortho effect.
(IV) is least acidic since +R effect of $O H$ group is more pronounced over its -I effect.
(III) is more acidic than (I) as -I effect of $O H$ stabilised the conjugate base.