(a)[3]
From the bond energies listed in the Data Booklet, work out the enthalpy change for this reaction. Give your answer with a sign.
(b(i))[2]
Explain what is meant by stereoisomerism and chiral centre.
(b(ii))[1]
Suggest why the two optical isomers are formed in equal amounts in this reaction.
(c(i))[5]
Complete the diagram to show the mechanism of this reaction. Include all required charges, partial charges, lone pairs and curly arrows, and show the structure of the intermediate.
(c(ii))[1]
Using your mechanism in (i), explain the role of $\text{NaCN}$ in this reaction.