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Chemistry · Oct / Nov 2020 · Paper 11 · Question 36

5070Formulae, functional groups and terminology

X is a branched hydrocarbon with the ratio of carbon atoms to hydrogen atoms being 1 : 2. X has a relative molecular mass of 56. What is the identity of X?

  1. AH-C(H)=C(H)-C(H)(H)-C(H)(H)-H (but-2-ene, straight chain)
  2. BH-C(H)(H)-C(H)(C(H)(H)(H))-C(H)(H)-H (methylpropane derivative)
  3. CH-C(H)(H)-C(H)(H)-C(H)(H)-C(H)(H)(H) (butane)
  4. DH-C(H)(H)-C(H)=C(H)-C(H)(H)-C(H)(H)(H) (pent-2-ene)

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Correct answer: B. H-C(H)(H)-C(H)(C(H)(H)(H))-C(H)(H)-H (methylpropane derivative)

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