Classifying incomplete and complete combustion reactions Steps:

• Identify reaction 1 (C4H10 + O2 → X) as incomplete combustion of butane, where X represents partial products like propanol under controlled conditions.
• Identify reaction 2 (C2H6 + O2 → CO2 + H2O) as complete combustion of ethane to CO2 and water.
• Match conditions: heat and catalyst enable controlled oxidation in reaction 1, while reaction 2 is standard combustion.
• Select option linking propanol (possible X), heat/catalyst, and combustion type for both.

Why D is correct:

• Propanol fits as a potential partial oxidation product (C3 alcohol from C4 alkane rearrangement), with heat/catalyst for controlled combustion aligning with reaction mechanisms.

Why the others are wrong:

• A: Butanol mismatches carbon count for X; high pressure irrelevant to combustion.
• B: Butanol incorrect; decomposition doesn't involve O2 producing oxides.
• C: Propanol fits X but decomposition ignores O2 role in oxidation/combustion.

Final answer: D