(i) $H_{3} C - O | | C - C H_{3}$
(ii) $H_{3} C - O | | C - C H_{2} - O | | C - C H_{3}$
(iii) $P h - O H$
(iv) $H_{3} C - O | | C - O H$

Among the compounds the correct order of $p K a$ values are:

I V < I I I < I I < I

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I V < I < I I < I I I

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I V < I I < I I I < I

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I V < I I I < I < I I

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Solution

The correct option is A $I V < I I I < I I < I$
Carboxylic acid is stronger than alcohol than active methylene compound because of its stability.
Acid = $4 > 3 > 2 > 1$
$p K a \propto \frac{1}{a c i d} = 1 > 2 > 3 > 4$

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The decreasing nucleophilic order of the following compound is:

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C H_{3} - O | | C - O V - O | | C - C H_{3}

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