Which term best describes an $\mathrm{alkene}$ with two $\mathrm{alkyl}$ groups on the same side of the $\mathrm{double} \mathrm{bond}$?

• A. $\mathrm{cis}$
• B. $\mathrm{geminal}$
• C. $\mathrm{trans}$
• D. $\mathrm{vicinal}$

Answer: (A)

Verified step by step guidance

1. Understand the structure of an alkene: it contains a carbon-carbon double bond (C=C) with substituents attached to the carbons involved in the double bond.
2. Recall that the terms 'cis' and 'trans' describe the relative positions of substituents around a double bond: 'cis' means the substituents are on the same side, while 'trans' means they are on opposite sides.
3. Identify that 'alkyl groups on the same side of the double bond' corresponds to the 'cis' configuration because both alkyl groups are positioned on the same side of the alkene's double bond.
4. Recognize that 'geminal' refers to substituents on the same carbon atom, which is not the case here since the alkyl groups are on different carbons of the double bond.
5. Note that 'vicinal' means substituents on adjacent carbons but does not specify their relative positions (same or opposite side), so it is less precise than 'cis' for this description.