Some chemical reactions of organic compounds

2 marks · Hard

State the type of reaction and give a reason:

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Substitution; This is because a hydrogen atom in ethane is replaced by a bromine atom, with HBr as a second product.

Also accept: Substitution; a bromine atom replaces a hydrogen atom in ethane.

Common mistakes: Calling it addition; Calling it combustion

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Marking points

B1 · 1 mark · Correctly identifies the reaction as substitution

B2 · 1 mark · Gives correct reason (hydrogen atom replaced by bromine atom, HBr formed)

Worked solution

This reaction is substitution. A hydrogen atom in ethane is replaced by a bromine atom, and hydrogen bromide (HBr) is also produced.