Question

which is the name and chemical formula of the compound below?

• c -
• c - c - c - cooh
• c -

a) 2,2 - dimethylpentanoic acid; $c_5h_{11}cooh$
b) 3,3 - dimethylbutanoic acid; $c_5h_{11}cooh$
c) 2,2 - dimethylpentanoic acid; $c_5h_{14}cooh$
d) 4 - methylpentanoic acid; $c_5h_{11}cooh$
e) 3,3 - dimethylbutanoic acid; $c_6h_{12}cooh$

Explanation:

Step1: Count the carbon atoms in the longest chain

The longest carbon - chain has 5 carbon atoms (including the carboxyl carbon). So, the base name is pentanoic acid.

Step2: Locate and name the substituents

There are two methyl groups on the second carbon atom. So, the name is 2,2 - dimethylpentanoic acid.

Step3: Determine the chemical formula

The formula of pentanoic acid is \(C_{5}H_{11}COOH\).

Answer:

A. 2,2 - dimethylpentanoic acid; \(C_{5}H_{11}COOH\)