Chemistry Paper 2 Mistakes

Question 1

1,6-diaminohexane can also be formed in a two stage synthesis starting from 1,4-dibromobutane. Suggest the reagent and a condition for each stage in this alternative synthesis

Answer 1

Stage 1 : KCN dissolved in aqueous alcohol
Stage 2 : H2 and Ni

Question 2

Give one reason why ethanoyl chloride is not used in industrial synthesis

Answer 2

Vulnerable to hydrolysis
Corrosive
Dangerous to use

Question 3

State why a dicarboxylic acid can be distinguished from a diol with the same relative molecular mass by high resolution mass spectrometry using electrospray ionisation

Answer 3

The precise masses are different

Question 4

Explain how carbon dioxide causes global warming

Answer 4

C=O bonds in CO2 absorb infrared radiation.
Infrared radiation emitted by Earth does not escape from atmosphere