Which prefix corresponds to the alkyl group CH3CH2?

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Multiple Choice

Which prefix corresponds to the alkyl group CH3CH2?

Explanation:
Recognize alkyl prefixes by how many carbon atoms are in the substituent. The group CH3CH2- has two carbon atoms, so it is the two-carbon alkyl group named ethyl-. Methyl corresponds to a one-carbon substituent (CH3-), propyl to three carbons, and chloro is a halogen substituent, not an alkyl group. So the correct prefix is ethyl.

Recognize alkyl prefixes by how many carbon atoms are in the substituent. The group CH3CH2- has two carbon atoms, so it is the two-carbon alkyl group named ethyl-. Methyl corresponds to a one-carbon substituent (CH3-), propyl to three carbons, and chloro is a halogen substituent, not an alkyl group. So the correct prefix is ethyl.

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