Alkanes
2 marks · HardButane reacts with bromine in the presence of ultraviolet light. Write a balanced chemical equation for the mono-substitution reaction of butane with bromine. Name the type of reaction and describe briefly what happens during this reaction.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
Must show: chemical equation for mono-substitution: , identifies reaction as 'substitution', describes that a hydrogen atom is replaced by a bromine atom
Also accept: Accept correct structural or displayed formulae
Common mistakes: Incorrect balancing of equation; Omitting HBr as a product
Show mark scheme and worked solution
Marking points
B1 · 1 mark · States a correct balanced equation for mono-substitution:
B2 · 1 mark · Identifies reaction as substitution and describes that one hydrogen atom in butane is replaced by a bromine atom
Worked solution
The balanced equation is:
This is a substitution reaction. In this reaction, one hydrogen atom in butane is replaced by a bromine atom to form bromobutane and hydrogen bromide.