The strongest acid amongst the following compounds is :

a. CH base 3COOH

b. HCOOH

c. CH base 3CH base 2CH(CI)CO base 2H

d. CICH base 2CH base 2CH base 2COOH

'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