Question

Identify the homologous series among the following:

1. $CHOOH$

2. $C_2{H}_{3}OOH$

3. $C_2{H}_6$

4. $C_3{H}_{5}OOH$

5. Propanone

• A. 1, 2 and 4 belongs to homologous series
• B. 1, 2 and 5 belongs to homologous series
• C. 1, 3 and 4 belongs to homologous series
• D. 1, 2 and 5 are homologous series

Answer 1

The correct option is A

1, 2 and 4 belongs to homologous series

A series of compounds in which the same functional group substitutes for hydrogen in a carbon chain is called a homologous series.

1, 2 and 4 have same functional group (-COOH), so they are homologous in nature.

The functional group of propanone is ketone, so it is not homologous with 1,2 and 4.

Again $C_2{H}_6$ belongs to alkanes it has no other functional group.