Question

What is the structure of `"2-methylpentanaldehyde"`?

Answer 1

`H_3C-CH_2CH_2CH(CH_3)C(=O)H`

Explanation:

As an aldehyde, there is a carbonyl group, a formyl group, at the head of the chain. The formyl carbon is clearly `C1`. `C2` bears the methyl group.