The Cope rearrangement, [3,3]-sigmatropic shift, of meso-3,4-dimethyl-1,5-hexadiene gives which of the following?
A) 1,7-octadiene
B) (2Z,6Z)-2,6-octadiene
C) (2E,6Z)-2,6-octadiene
D) (2E,6E)-2,6-octadiene

'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