MCQ
Which compound shows cis-trans isomerism
- A$1-$butene
- B$2-$propene
- ✓$2-$butene
- DBenzene
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In the above reaction, the structural formula of $(A), "X"$ and $"Y"$ respectively are :
[Atomic masses (in $u$) $Mn =55 ; Cl =35.5 ; O =16, I =127, Na =23, K =39, S =32]$