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Question

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-ene CH2=CHCH2CH3
number of alpha hydrogen is 2
2,3- Dimethylbut - 2 -ene CH3C(CH3)=C(CH3)CH3
number of alpha hydrogen is 12
2-Methylbut-2-ene CH3C(CH3)=CHCH3
number of alpha hydrogen is 9
2-methylpropene CH3C(CH3)=CH2
number of alpha hydrogen is 6

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