Considering the following alkenes: But-1-ene(i)2,3−Dimethylbut−2−ene(ii)2-Methylbut-2-ene(iii)2-Methylpropene(iv)
The order of stability is
A
I > II > III > IV
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B
II > III > IV > I
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C
IV > III > II > I
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D
III > IV > I >
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Solution
The correct option is B II > III > IV > I The stability of the alkene depends upon the number of alpha hydrogens.
But-1-eneCH2=CH−CH2−CH3
number of alpha hydrogen is 2 2,3- Dimethylbut - 2 -eneCH3−C(CH3)=C(CH3)−CH3
number of alpha hydrogen is 12 2-Methylbut-2-eneCH3−C(CH3)=CH−CH3
number of alpha hydrogen is 9 2-methylpropeneCH3−C(CH3)=CH2
number of alpha hydrogen is 6