I have seen in a book thatdue to resonance in CHO-CHO , partial double bond character is formed making it a restricted rotation structure and hence satisfying all the required conditions and able to show geometrical isomerism!!Is it true??Help me frnds..

'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