Among the compounds given in the options A-D, the one that can be used as a formyl anion

equivalent (in the presence of a strong base) is

(A) ethylene (B) nitroethane (C) 1,3-dithiane (D) 1,4-dithiane

'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