Arrange the following alkenes in order of their decreasing heat of combustion values:
A
1>2>3
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B
1>3>2
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C
2>3>1
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D
3>2>1
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Solution
The correct option is B1>3>2
Alkene 1 has 2 alpha hydrogens. Alkene 2 has 8 alpha hydrogens. Alkene 3 has 6 alpha hydrogens. More the number of alpha hydrogens more is the stability and lesser is the heat of combustion. Order of stability: 2>3>1 Decreasing order of heat of combustion: 1>3>2 So, (b) is the correct option.