MCQ
Product $(A)$ is


- A$trans-2 -$ butane
- ✓$cis-2 -$ butene
- C$1 -$ butene
- DIso- butene


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$(1)$ $BeCl _2, CO _2, BCl _3, CHCl _3$
$(2)$ $SO _2, C _6 H _5 Cl , H _2 Se , BrF _5$
$(3)$ $BF _3, O _3, SF _6, XeF _6$
$(4)$ $NO _2, NH _3, POCl _3, CH _3 Cl$
