But the answer for the below question is 2-Pentanol....even when I saw this question I thought propanaldehyde would be the answer. But the answer given was 2-pentanol...so I am confused with it please clarify....

'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