Question

Match each of the following carboxylic acids to their appropriate pKa values (5.0, 0.2 and 2.7): (A) FCH2COOH (B) (CH3)3CCOOH (C) CF3COOH

Answer 1

Step-by-step explanation:

Higher the acidic strength , lower the pKa value.

Among the given acids , CF₃COOH is most acidic because of 3 fluorine atom attached with carbon . fluorine is highly electro-negative electron withdrawing group .

So , acidic strength of given acids will decrease as follows

CF₃COOH > FCH₂COOH > (CH3)₃CCOOH

Hence CF₃COOH will have least pka value ie 0.2

pka value of FCH₂COOH will be 2.7

pka value of (CH3)₃CCOOH will be 5.0