The intermediate in Gattermann - Koch aldehyde synthesis is

(a) Formyl Carbonium ion (b) Imino formyl carbonium ion (c) Methyl Carbonium ion

(d) An nucleophile

'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