2 moles of acetaldehyde are warmed in the presence of 10% Ba(OH)2 to give a product which dehydrates to a compound ‘X’. The compound on reduction with NaBH4 will give

a)CH3CH=CHCHO

b)CH3CH=CHCH2OH

choose and explain please

'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