Among the following acids which has the lowest pK base a value?

a. CH base 3CH base 2COOH

b. (CH base 3) base 2 CH – COOH

c. HCOOH

d. CH base 3COOH

'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