The test for unsaturated compounds

2 marks · Normal

State the displayed formula of the product formed when but-1-ene reacts with bromine water, and give its name.

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

Displayed formula: CH2BrCH2CH2CH2Br; Name: 1,2-dibromobutane

Also accept: H2CBr–CH2–CH2–CH2Br; 1,2-dibromobutane

Common mistakes: wrong carbons/bromines in formula; wrong name: dibromobutene

Show mark scheme and worked solution

Marking points

B1 · 1 mark · Correct displayed or structural formula (accept CH2BrCH2CH2CH2Br, or fully expanded displayed form).

B2 · 1 mark · Name: 1,2-dibromobutane

Worked solution

Displayed formula: CH2Br–CH2–CH2–CH2Br (or CH2BrCH2CH2CH2Br).

Name: 1,2-dibromobutane.