Among the following acids which have the lowest pKa value?

(1) CH3COOH

(2) HCOOH

(3) (CH3)2COOH

(4) CH3CH2COOH

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

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how to represent the possible fischer projections for 2-bromohexane