Identify the compound

Cyclohexene is a six-membered carbon ring containing one double bond.

Its structure is: $\text{a cyclic hydrocarbon with one } C=C \text{ bond}$

Check whether it is aromatic

For a compound to be aromatic, it must:

• be cyclic,
• be planar,
• have continuous conjugation,
• satisfy Hückel's rule: $(4n+2)\pi$ electrons.

Cyclohexene has only one double bond, so the ring is not fully conjugated. Therefore, it is not aromatic.

So, options A and B are not suitable because they refer to benzenoid compounds, which are benzene-like systems.

Check whether it is acyclic

Cyclohexene is clearly a ring compound, so it is not acyclic.

Hence, option C is incorrect.

Classify the compound correctly

Cyclohexene is:

• cyclic
• non-aromatic
• aliphatic in nature

Such compounds are called alicyclic compounds.

Therefore, the correct option is: $\boxed{\text{D: Alicyclic}}$

Compare with stored correct answer

Stored correct answer: D

Derived answer: D

These match.