Question

how many carbons are there in the main chain of the compound 2 - hydroxy - 3 - methylbutanoic acid?

• your answer should be an integer.

provide your answer below:

carbons

Explanation:

Step1: Analyze the root name

In organic chemistry, the root name "but" in "butanoic acid" indicates a 4 - carbon chain.

Step2: Consider substituents and main - chain selection

Substituents like "hydroxy" and "methyl" are attached to the main chain. But the main chain is still determined by the root name of the carboxylic acid. For carboxylic acids, the main chain includes the carboxyl carbon ($-COOH$). The root "but" comes from butane ($C_4H_{10}$), and when it is butanoic acid, the main chain has 4 carbons (including the carboxyl carbon).

Answer:

4