A is CH3CHBrCH2CH3.

1. (a)(i)Some reactions of A are shown. [Figure showing reaction scheme] Name A.[1]
2. (a)(ii)Name the class of compound to which B belongs.[1]
3. (b)There are three structural isomers of A. Draw the structures of these three isomers of A.[2]
4. (c)(i)Reaction 1 occurs by two different mechanisms at the same time. These mechanisms are referred to as SN1 and SN2. State what the letters 'S' and 'N' represent in the abbreviation SN1.[1]
5. (c)(ii)Complete the SN1 mechanism for reaction 1. Include the structure of the intermediate and all necessary charges, dipoles, lone pairs and curly arrows.[3]
6. (d)The SN1 mechanism for reaction 1 is repeated using CH3CHCICH2CH3 or CH₃CHICH2CH3 in place of the CH3CHBrCH2CH3. State and explain how the rates of these two reactions will compare with the rate of the original reaction using CH3CHBrCH2CH3.[3]
7. (e)Reaction 2 uses the same reagent as reaction 1, but under different conditions. State two differences in the conditions needed to ensure that reaction 2 is more likely to take place than reaction 1 when this reagent is added.[2]

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.