Question

The molecular formula of a hydrocarbon is CHg, what would be the molecular formula
and name of the next member in this homologous series?​

Answer 1

) C

n

H

2n+2

corresponds to general formula of alkanes. Since, alkanes are saturated so this series is saturated series.

(ii) Alkanes

C

2

H

2×2+2

=C

2

H

6

(Ethane)

H

3

C−CH

3

(iii) Methane with molecular formula CH

4

is first member of this series.

(Refer to Image)

(iv) Homologous series is a series of compounds with same functional group. They have similar chemical properties and physical properties. Compounds of same homologous series have same general formula.

Common difference between successive members of family is −CH

2

group.

(v) n-butane

C

4

H

10

CH

3

−CH

2

−CH

2

−CH

3

n-pentane

C

5

H

12

CH

3

−CH

2

−CH

2

−CH

2

−CH

3