Question

Assertion (A) IUPAC name of $CH _{3} CH _{2} CH _{2} COOH$ is butyric acid.
Reason (R) In the IUPAC system, aliphatic carboxylic acids are named by replacing the ending -e in the name of the corresponding alkane with -oic acid.

• A. Both $A$ and $R$ are correct; and $R$ is the correct explanation of $A$.
• B. Both $A$ and $R$ are correct; but $R$ is not the correct explanation of $A$.
• C. $A$ is correct ; but $R$ is incorrect.
• D. $R$ is correct ; but $A$ is incorrect.

Answer 1

Answer: (D)

The IUPAC name of $CH _{3} CH _{2} CH _{2} COOH$ is butanoic acid. In the IUPAC system, aliphatic carboxylic acids are named by replacing the ending '-e' in the name of the corresponding alkane with -oic acid.