When formaldehyde is treated with CH3MgBr and product obtained is passes through acidhydrolysis to obtain A as main product and product À with alcoholic KÕH gives ethene.The
compound A is?
i) ethyl alcohol
ii)propyl alcohol
iii)formaldehyde
iv)none of above these​

'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