Which of the following lists contains the correct IUPAC systematic names for the three alkenes: ${\mathrm{CH}}_2={\mathrm{CH}}_2$, ${\mathrm{CH}}_3\mathrm{CH}={\mathrm{CH}}_2$, and ${\mathrm{CH}}_3\mathrm{CH}={\mathrm{CH}}_3$?

• A. ethyne, propyne, butyne
• B. ethene, propene, 2-butene
• C. ethene, propane, butane
• D. ethene, propene, but-1-ene

Answer: (D)

Verified step by step guidance

1. Identify the molecular formulas and structures of the given alkenes: CH\_2=CH\_2, CH\_3CH=CH\_2, and CH\_3CH=CH\_3.
2. Recall that the IUPAC naming for alkenes is based on the longest carbon chain containing the double bond, with the suffix '-ene' indicating the presence of a double bond.
3. For CH\_2=CH\_2, the molecule has two carbons and a double bond between them, so the correct name is 'ethene'.
4. For CH\_3CH=CH\_2, the molecule has three carbons with a double bond starting at the first carbon, so the correct name is 'propene'.
5. For CH\_3CH=CH\_3, the molecule has three carbons but the double bond is between the second and third carbons, which is equivalent to the first position when numbering from the other end, so the correct name is 'but-1-ene'.