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6.2 Organic chemistry

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Question 4

A polymer manufacturer is identifying an unknown diol used to make a polyester film.

The other monomer is the dicarboxylic acid HOOC−(CH2)3−COOH\mathrm{HOOC{-}(CH_2)_3{-}COOH}HOOC−(CH2​)3​−COOH. Analysis shows that the section of the chain that repeats contains one unit from each monomer and has a relative formula mass of 186.

Relative atomic mass (ArA_rAr​): H = 1.0 C = 12.0 O = 16.0

What is the relative formula mass of the unknown diol?

[1]
A

90

B

88

C

72

D

54

Markscheme

6.2 Organic chemistry Questions

  1. GCSE
  2. /Chemistry
  3. /6.2 Organic chemistry

131 exam-style questions on OCR GCSE Chemistry 6.2 Organic chemistry, covering 6.2.1 Crude oil and fractional distillation, 6.2.2 Cracking and dependence on hydrocarbons, 6.2.3 Functional groups and homologous series, 6.2.4 Reactions of alkanes, alkenes and alcohols, 6.2.5 Addition polymerisation and repeat units, 6.2.6 Naturally occurring polymers, 6.2.7 Chemical cells and fuel cells, and 6.2.8 Condensation polymerisation and how to make one. Each one has a worked solution and a mark scheme showing where the marks go.

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