Final answer:
Pentanoic acid contains 1 CH3 group, 3 CH2 groups, and no CH groups, as it consists of a five-carbon chain with a carboxylic acid group at one end.
Step-by-step explanation:
The student is asking how many CH3, CH2, and CH groups are in pentanoic acid, which is an organic compound with the formula C5H10O2. Pentanoic acid has a chain of five carbon atoms with a carboxylic acid group (-COOH) at the end. As for the number of hydrocarbon groups in pentanoic acid:
- There is one CH3 group at the end of the chain opposite the carboxylic acid group.
- There are three CH2 groups between the CH3 group and the carboxylic acid group.
- There are no CH groups, as all the carbons in the chain are either part of a CH3 or a CH2 group.
Therefore, in pentanoic acid there is 1 CH3 group, 3 CH2 groups, and 0 CH groups.
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