How do we name this compound,ch3ch2chcl

This is an alkane with a halogen substituent.

1. Identify the longest carbon chain: The longest chain has 3 carbons, making it a propane.
2. Number the carbon chain: Number the chain so the substituent has the lowest possible number. In this case, starting from the left, the chlorine is on carbon 2.
3. Identify and name the substituent: There is one chlorine atom, so it's a chloro group.
4. Combine the parts: Place the substituent name and its position before the parent chain name.

The name is 2-chloropropane.