L1 /
4
CH1012
HALF REACTION
METHOD II
4) If e- appear on the RHS the rxn is an oxn.
If e- appear on the LHS the rxn is an redn.
If e- appear on the LHS the rxn is an redn.
eg. CH3CH=CH2 ® CH3CH(OH)C(OH)H2
propene propan-1,2-diol
acid solution
acid solution
CH3CH=CH2 + 2H2O ®
CH3CH(OH)C(OH)H2
CH3CH=CH2 + 2H2O ®
CH3CH(OH)C(OH)H2 +
2H+
CH3CH=CH2 + 2H2O ®
CH3CH(OH)C(OH)H2 +
2H+ + 2e-
As e- are on the RHS this is an oxidation
(N.B. the organic
redox material is covered
in the Book of Readings)
in the Book of Readings)
