Classify 1,3-butadiene correctly within petroleum hydrocarbon families by identifying whether it behaves as a single-bond olefin, a di-olefin (conjugated diene), an aromatic compound, or a naphthene (cyclo-paraffin).

Introduction:
Butadiene (specifically 1,3-butadiene) is a key building block in petrochemistry and polymer manufacturing. This question checks whether you can correctly classify it among common hydrocarbon families used in refining and fuels: paraffins, naphthenes, aromatics, and olefins (including diolefins).

Given Data / Assumptions:

• Compound: 1,3-butadiene (C4H6)
• Context: petroleum hydrocarbon classification
• Compare against: naphthenes, aromatics, mono-olefins, di-olefins

Concept / Approach:
Hydrocarbon families are defined by bonding and ring structure. Olefins have C=C unsaturation; diolefins (dienes) contain two C=C bonds. Naphthenes are saturated cyclics. Aromatics have a conjugated ring that follows the 4n+2 rule (e.g., benzene).

Step-by-Step Solution:

Verification / Alternative check:
A quick rule: dienes have two double bonds; 1,3-positions confirm a conjugated system, still non-aromatic because there is no ring.

Why Other Options Are Wrong:

Common Pitfalls:
Confusing “conjugated” with “aromatic.” Conjugation alone does not imply aromaticity; a cyclic aromatic ring is required.

Final Answer:
Di-olefin (conjugated diene)