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Question

How many alkenes (only structural isomers) are possible with the molecular formula C4H8?

A
4
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B
3
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C
5
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D
6
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Solution

The correct option is B. 3

The structural isomer of a compound is another compound whose molecule has the same number of atoms of each element, but with logically distinct bonds between them.
In this given molecular formula i.e.C4H8 there are 5 structural isomers can be formed as follows:
1) but1ene
2) but2ene
3) 2methylprop1ene
4) cyclobutane
5) 1methylcyclopropane

1322410_1266493_ans_d42ae9dd0564416c8533d28446aeb87c.jpg

But out of 5 structural isomers, only three belong to the alkene family i.e. but1ene,but2ene,2methylprop1ene. and rest two belong to cycloalkane (i.e. cyclobutaneand1methylcyclopropane)

Hence the correct answer is option B. 3


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