Q.

Among the following acids, which has the lowest pKa value ? 

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a

(CH3 ) 2 CH–COOH

b

HCOOH

c

CH3 CH2 COOH

d

CH3 COOH

answer is B.

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Detailed Solution

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Among alkanoic acids, Formic acid is the strongest acid and will have lowest pKa value.

pKa  α  1acidic strength

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