Some chemical reactions of organic compounds
3 marks · EasyClassify each of these organic reactions as addition, substitution, or combustion.
C2H4(g) + H2(g) C2H6(g)
CH4(g) + Cl2(g) CH3Cl(g) + HCl(g)
C3H8(l) + 5O2(g) 3CO2(g) + 4H2O(l)
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
(a) Addition
(b) Substitution
(c) Combustion
Common mistakes: confusing substitution and addition
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · Correctly identifies Reaction a as 'addition'.
B2 (b) · 1 mark · Correctly identifies Reaction b as 'substitution'.
B3 (c) · 1 mark · Correctly identifies Reaction c as 'combustion'.
Worked solution
a Addition: H2 is added to an alkene without removing atoms. b Substitution: An H atom in methane is replaced by Cl. c Combustion: Propane burns in oxygen to form CO2 and H2O.