Question

. The compounds CH, CH, CH.CH,, are in homologous series. Why? Write
the general name and general formula for these carbon compounds.​

Answer 1

Answer:

(a) Give the general name of the class of compounds having the general formula C

n

H

2n−2

. Write name of the first members of this homologous series.

(b) The general formula of a homologous series of carbon compounds is C

n

H

2n

. Write the molecular formulae of the second and fourth members of the series.

(c) Write the molecular formulae of the third and fifth members of homologous series of carbon compounds represented by the general formula C

n

H

2n+2

.

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Answer

(a) Alkynes, C

n

H

2n−2

First member: Ethyne

(b) Alkene

Second member : C

2

H

4

Fourth member : C

4

H

8

(c) Alkanes

Third member : C

3

H

8

Fifth member : C

5

H

12

.