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Solution


Q.

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R:

Assertion A: pKa value of phenol is 10.0 while that of ethanol is 15.9.

Reason R: Ethanol is stronger acid than phenol. 

In the light of the above statements, choose the correct answer from the options given below:             [2024]
1 A is true but R is false.  
2 Both A and R are true but R is NOT the correct explanation of A.  
3 Both A and R are true and R is the correct explanation of A.  
4 A is false but R is true.  

Ans.

(1)

Phenols are stronger acids than alcohols because phenoxide ion is resonance stabilised whereas there is no resonance in alkoxide ion.