5.6—The mechanism (including diagrams), giving evidence where possible, of: i the electrophilic addition of bromine and hydrogen

Be able to describe the mechanism (including diagrams), giving evidence where possible, of: i the electrophilic addition of bromine and hydrogen bromide to ethene ii the electrophilic addition of hydrogen bromide to propene Use of the curly arrow notation is expected – the curly arrows should start from either a bond or from a lone pair of electrons. Knowledge of the relative stability of primary, secondary and tertiary carbocation intermediates is expected.

Use —the mechanism (including diagrams), giving evidence where possible, of: i the electrophilic addition of bromine and hydrogen to connect the rule to the data and decision in the question.

This matters because —the mechanism (including diagrams), giving evidence where possible, of: i the electrophilic addition of bromine and hydrogen determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply —the mechanism (including diagrams), giving evidence where possible, of: i the electrophilic addition of bromine and hydrogen to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: —The mechanism (including diagrams), giving evidence where possible, of: i the electrophilic addition of bromine and hydrogen is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.