The chemical formula "CH3CH2CHCHCH3" is a bit ambiguous and likely has a typo. It's missing a hydrogen atom on one of the carbons.

Here are two possible interpretations:

1. CH3CH2CH=CHCH3

* This represents 2-pentene, an alkene with a double bond between the second and third carbon atoms.

2. CH3CH2CH2CH2CH3

* This represents pentane, an alkane with a chain of five carbon atoms.

It's crucial to be precise with chemical formulas to avoid confusion. If you could provide more context or clarify the formula, I can give you a more accurate answer.