Which formula represents the correct isomer of CH2= CH− CH2−CH3 ?
a) CH3−CH3= CH3−CH3
b) CH3−CH= CH−CH3
c) CH3−CH2−CH2−CH3
d) CH3−CH−CH2−CH3

                   Option-B CH3−CH= CH−CH3

Explanation:

                    Isomers are defined as those compounds which have same molecular formula but structural formula. This means that isomers differ from each other only in connectivity patterns. Tho solve this problem we will find out the molecular formula of each given compound and then will compare to the reference compound.

Reference Compound:

                                     CH2= CH− CH2−CH3  

                                     Molecular Formula  =  C₄H₈

Option-A:

                                     CH3−CH3= CH3−CH3

                                     Molecular Formula  =  C₄H₁₂

Option-B:

                                     CH3−CH= CH−CH3

                                     Molecular Formula  =  C₄H₈

Option-C:

                                     CH3−CH2−CH2−CH3

                                     Molecular Formula  =  C₄H₁₀

Option-D:

                                     CH3−CH−CH2−CH3

                                     Molecular Formula  =  C₄H₉

Result:

         As it can be seen that Option-B has the same molecular formula as the reference compound. Hence, it is the correct answer.

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