Q.

Correct order of acidic strength

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a

4 > 2 > 1 > 3

b

1 > 2 > 3 > 4

c

2 > 4 > 3 > 1

d

4 > 3 > 2 > 1

answer is C.

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Detailed Solution

Presence of electron withdrawing group increases acidic nature due to Mesomeric and Inductive effect and electron donating group decreases acidic nature.

-CHO: electron withdrawing group

-CH2CH3: Strong electron donating group

-OH: due to mesomeric effect, it has electron donating tendency

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