Skip to content

Course home

Sign up

6.2 Organic chemistry

EasyMediumHard
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869
Question 29

A technician compares two alcohols, P and Q. Separate samples are warmed with excess acidified potassium manganate(VII) until each reaction is complete. In each reaction, the product is a carboxylic acid.

AlcoholFormula
PC3H7OH\mathrm{C_3H_7OH}C3​H7​OH
QC7H15OH\mathrm{C_7H_{15}OH}C7​H15​OH

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

A student concludes:

“The relative formula mass increases by the same percentage in both reactions.”

Calculate the percentage increase in relative formula mass for each alcohol. Evaluate the student's conclusion.

[4]
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.

Question bank