Which of the following functional groups contains $=$ double bonds?

• A. $\mathrm{Alkene}$
• B. $\mathrm{Ether}$
• C. $\mathrm{Alcohol}$
• D. $\mathrm{Alkane}$

Answer: (A)

Verified step by step guidance

1. Step 1: Understand what a double bond means in organic chemistry. A double bond typically refers to a bond where two pairs of electrons are shared between two atoms, often represented as '=' between carbon atoms in a molecule.
2. Step 2: Review the structure of each functional group given: Alkene, Ether, Alcohol, and Alkane. Identify the type of bonds present in each group.
3. Step 3: Recognize that an Alkene contains at least one carbon-carbon double bond (C=C), which is the defining feature of this functional group.
4. Step 4: Note that an Ether contains an oxygen atom connected to two alkyl or aryl groups by single bonds (C-O-C), with no double bonds involved.
5. Step 5: Understand that Alcohols have a hydroxyl group (-OH) attached to a saturated carbon atom, and Alkanes consist entirely of single bonds (C-C and C-H), so neither contain double bonds.