Name this molecule: CH3 CH CH CH3.

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Multiple Choice

Name this molecule: CH3 CH CH CH3.

Explanation:
This test checks how to name alkenes by counting carbon atoms and locating the C=C bond. The molecule has four carbons in a chain, and the double bond sits between the second and third carbons, giving a name that ends with -ene and a position of 2. Written out, it’s CH3-CH=CH-CH3, which is four carbons with a double bond in the middle, not a two-carbon ethene, a three-carbon propene, or a fully saturated butane. So the correct name is but-2-ene.

This test checks how to name alkenes by counting carbon atoms and locating the C=C bond. The molecule has four carbons in a chain, and the double bond sits between the second and third carbons, giving a name that ends with -ene and a position of 2. Written out, it’s CH3-CH=CH-CH3, which is four carbons with a double bond in the middle, not a two-carbon ethene, a three-carbon propene, or a fully saturated butane. So the correct name is but-2-ene.

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