How many of the following compounds boiling point of cis trans.

CH^3CH=CH-CH^3, ClCH=CHCl, BrCH=CHBr, ICH=CHI, CH^3CH=CHCl

'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