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Chemistry · Oct / Nov 2025 · Paper 11 · Question 31

5070Formulae, functional groups and terminology

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

  1. AH-C(=C)-C-H structural formula (but-2-ene type structure)
  2. BH-C-C(=C)-C-H structural formula (methylpropene type structure)
  3. CH-C-C-C-H with methyl branch structural formula (2-methylpropane type structure)
  4. DH-C=C-C-C-H structural formula (pent-2-ene type structure)

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Correct answer: B. H-C-C(=C)-C-H structural formula (methylpropene type structure)

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