Identifying molecules with multiple C=C bonds

Steps:

• Review the structural formulas for molecules 1, 2, and 3 to locate carbon-carbon double bonds.
• Count double bonds in molecule 1: it has only one C=C.
• Count in molecule 2: it has two C=C bonds.
• Count in molecule 3: it has two C=C bonds.

Why D is correct:

• Option D selects molecules 2 and 3, both containing at least two C=C double bonds per their Lewis structures.

Why the others are wrong:

• A includes molecule 1, which has only one double bond.
• B includes molecule 1 (one bond) but excludes molecule 3 (two bonds).
• C includes molecule 1 (one bond) but excludes molecule 2 (two bonds).

Final answer: D