question_answer

The number of possible structural isomers of butene are:

A)  3                                            

B)  2

C)  4                            

D)         5

E)  1

Correct Answer: A

Solution :

The number of possible structural isomers of butene are: \[\underset{butene-1}{\mathop{{{H}_{3}}C-C{{H}_{2}}-CH=C{{H}_{2}}}}\,\] \[\underset{butene-2}{\mathop{{{H}_{3}}C-CH=CH-C{{H}_{3}}}}\,\] So, the number of isomers are three.