1.1. Consider the following reaction sequence shown in Figure 1.

Figure 1

Explain what is meant by the terms electrophile and substitution reaction.

1.2. Step 1 in the reaction scheme shows the preparation of compound A from methylbenzene.

Identify suitable reagents for Step 1 outlined in Figure 1.

Give the name or formula of the electrophile involved in Step 1 and write one equation to show its formation.

Outline the mechanism for Step 1.

1.3. For Step 2, give the reagents and write an equation for this reaction using [H] to represent the reducing agent. 

1.4. Give the m/z value of a major peak which could appear in the mass spectrum of methylbenzene, but would not appear in the spectrum of Compounds A and B.

Justify your answer.