Check statement (A): Non-metals generally have higher electronegativity than metals.

• Metals tend to lose electrons easily, so their electronegativity is low.
• Non-metals tend to attract electrons, so their electronegativity is higher.

Hence, (A) is correct.

Check statement (B): Non-metals have lower ionisation enthalpy than metals.

• In general, non-metals hold their electrons more strongly than metals.
• Therefore, non-metals usually have higher ionisation enthalpy, not lower.

Hence, (B) is incorrect.

Check statement (C): Compounds formed between highly reactive non-metals and highly reactive metals are generally ionic.

• Highly reactive metals readily lose electrons.
• Highly reactive non-metals readily gain electrons.
• This electron transfer leads to ionic compounds.
• Example: $\mathrm{NaCl}$, $\mathrm{CaF_2}$.

Hence, (C) is correct.

Check statement (D): The non-metal oxides are generally basic in nature.

• Non-metal oxides are generally acidic or sometimes neutral.
• Example: $\mathrm{CO_2}$ and $\mathrm{SO_2}$ are acidic oxides.

Hence, (D) is incorrect.

Check statement (E): The metal oxides are generally acidic or neutral in nature.

• Metal oxides are generally basic or amphoteric.
• Example: $\mathrm{Na_2O}$ is basic, $\mathrm{Al_2O_3}$ is amphoteric.

Hence, (E) is incorrect.

Correct combination:

The correct statements are (A) and (C) only.

Therefore, the correct option is D.