2025 · Q99
Which one among the following statements is not correct?
general-sciencechemistry
- AThe reaction of methane and chlorine in sunlight produces hydrogen gas.
- BPalladium catalyzes the addition of hydrogen gas on an alkene.
- CEthanol burns in oxygen to give carbon dioxide, water and releases heat and light.
- DUnsaturated hydrocarbons burn with a sooty flame.
Explanation
Methane reacts with chlorine in sunlight by free-radical substitution to give chloromethane and hydrogen chloride — not hydrogen gas — so statement A is not correct. Palladium does catalyse the addition of hydrogen to alkenes, ethanol burns in oxygen to give carbon dioxide, water, heat and light, and unsaturated hydrocarbons burn with a sooty flame. Hence A is the not-correct statement.