BMAT 2014 Section 2 Question 14

Which of the following statements about but-1-ene are true?
1 it can form a polymer
2 it contains C–C single bonds only
3 it conforms to the general formula CnH2n
4 it decolourises bromine water
5 it is saturated

Answer:

The name ‘but-1-ene’ indicates that it is an alkene. Alkenes have the following features:

  • general formula is CnH2n
  • they contain C=C double bonds and so are unsaturated
  • they undergo addition reactions such as polymerisation (to produce a long chain polymer) and
    addition of bromine (so they decolourise bromine water – the test for unsaturation / presence
    of C=C double bonds).
    But-1-ene can form a polymer, it fits the general formula CnH2n and decolourises bromine water; and
    because it contains carbon-carbon double bonds it is not saturated.
    The answer is C

Sami Qamar

I’m Sami Qamar. I’m a YouTuber, Blogger, and first year med student.

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