1.

Define structural isomer and draw the isomeric structures of butane. Compare the structure of benzene and cyclohexane, by drawing them.

Answer»

Solution :Carbon compounds having same molecular FORMULA but different structural formula are called structural isomers.
Example: BUTANE `(C_4H_10)` shows the following two structural isomers
`H-underset(H)underset(|)overset(H)overset(|)(C )-underset(H)underset(|)overset(H)overset(|)(C )-underset(H)underset(|)overset(H)overset(|)(C )-underset(H)underset(|)overset(H)overset(|)(C )-underset(H)underset(|)overset(H)overset(|)(C )-H`
n - butane
`H-overset(H)overset(|)(C)-underset(H)underset(|)underset(H-C-H)underset(|)overset(H)overset(|)(C )-underset(H)underset(|)overset(H)overset(|)(C )-H`
Iso-butane
Structures of benzene and cyclocohexane

`{:("Benzene" C_6H_6 ,"Cyclohexane" C_6H_12),("Benzene has 6 carbon atoms","Cyclohexane has 6 carbon"),("and 6 hydrogen atoms".,"atoms and 12 hydrogen"),("Benzene has alternately","atoms. It does not consists"),("single and DOUBLE bond","of double bond between"),("between carbon atoms. It","carbon atoms".),("has three double bonds",):}``


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