15)	How many isomers of C5H11OH will be primary alcohols ? (A) 2 (B) 3 (C) 4 (D) 5

the ans is 4 but hw..???

i thought there are only 3 isomers !! explain!!

'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