Some chemical reactions of organic compounds

2 marks · Normal

State the type of reaction occurring when but-1-ene reacts with hydrogen gas to form butane. Briefly explain your answer.

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Also accept: addition; as hydrogen atoms add across the double bond and no atoms are lost or replaced; It is an addition reaction because hydrogen is added to the double bond of but-1-ene to form butane without removing any part of the original molecule.

Common mistakes: Calling it substitution or combustion

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Marking points

B1 · 1 mark · Correctly states the reaction type is addition.

B2 · 1 mark · Explanation includes that hydrogen is added across the double bond or no atoms are replaced/removed.

Worked solution

This is an addition reaction. Hydrogen adds across the double bond in but-1-ene, converting it into butane, and no atoms are removed from the original molecule.