A) \[{{R}_{2}}C=C{{R}_{2}}\]
B) \[RCH=CHR\]
C) \[C{{H}_{2}}=C{{H}_{2}}\]
D) \[RCH=C{{R}_{2}}\]
Correct Answer: A
Solution :
Alkylated alkenes are most stable than other. Greater the alkylation of an alkene i.e. greater the number of alkyl group in an alkene, greater is its stability, thus the stability order is: \[R-\underset{\begin{smallmatrix} | \\ R \end{smallmatrix}}{\mathop{C}}\,=\underset{\begin{smallmatrix} | \\ R \end{smallmatrix}}{\mathop{C}}\,-R>{{R}_{2}}C=CHR>RCH=CHR\] most stable (tetra alkylated ethylene) \[\approx {{R}_{2}}C=C{{H}_{2}}>R-CH=C{{H}_{2}}>C{{H}_{2}}=C{{H}_{2}}\] least stable
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