Name this molecule: C2H4

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Multiple Choice

Name this molecule: C2H4

Explanation:
The hydrogen count tells us about the bonds between the carbon atoms. For a two-carbon hydrocarbon, a single bond between them would leave C2H6 (ethane). Having four hydrogens means two fewer hydrogens than the saturated alkane, which happens when there is a carbon–carbon double bond. That gives C2H4, which is ethene. The name shows two carbons (eth-) and a double bond (-ene). Other options don’t fit the formula: ethane would have more hydrogens, ethyne would have a triple bond (C2H2), and ethanoic acid would include oxygen and a carboxyl group, giving C2H4O2.

The hydrogen count tells us about the bonds between the carbon atoms. For a two-carbon hydrocarbon, a single bond between them would leave C2H6 (ethane). Having four hydrogens means two fewer hydrogens than the saturated alkane, which happens when there is a carbon–carbon double bond. That gives C2H4, which is ethene. The name shows two carbons (eth-) and a double bond (-ene). Other options don’t fit the formula: ethane would have more hydrogens, ethyne would have a triple bond (C2H2), and ethanoic acid would include oxygen and a carboxyl group, giving C2H4O2.

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