Question

Assertion (A): Following are the members of a homologous series: CH₃OH, CH₃CH₂OH, CH₃CH₂CH₂OH .

Reason (R): A series of compounds with the same functional group but differing by – CH₂ – unit is called a homologous series.

• A. Both (A) and (R) are true and (R) is correct explanation of the assertion
• B. Both (A) and (R) are true but (R) is not the correct explanation of the assertion.
• C. (A) is true but (R) is false.
• D. (A) is false but (R) is true

Answer 1

The correct option is A

Both (A) and (R) are true and (R) is correct explanation of the assertion

Explanation for correct option

• Homologous series is a series of compounds with similar chemical properties and the same functional group differing from the successive member by CH₂ unit. Carbon chains of varying lengths have been observed in organic compounds having the same general formula.
• Such organic compounds that vary from one another by a repeating unit and have the same general formula form a series of compounds.
• Here we can see the compounds here are of the same family that is of alcohol family and each of them differ by a CH₂ group.
• Hence both Assertion and Reason are True and R is the correct explanation of A.

Hence the correct option is option a.