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Q.

Which among the following has  highest pka value?

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a

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b

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c

 

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d

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answer is C.

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Detailed Solution

-NO is an electron withdrawing group because of its strong -I and -M effects when present at o,p positions to -OH group of phenol.

-NO is an electron withdrawing group because of its strong -I effect when present at meta position to -OH group of phenol.

Thus its power is more when present at o,p positions.

It increases acidic strength of a phenol…… p > o > m

-CH3 has +I and +R effect when present at o,p positions to -OH group of phenol.

It decreases the acidic strength of a compound.

It has highest pka value.

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