Edexcel IAL Chemistry 10.12 Halogenoalkane structural-class reactivity

Hold the halogen constant when isolating the structural trend, classify the carbon bearing X and use the observed rate or mechanism context to justify the order.

Exam points

Select the tertiary halogenoalkane as fastest when comparing structural isomers.
Explain a structural-rate difference using halogenoalkane class and mechanism context.

[Maximum number: 1]

This question is about bromoalkanes with the molecular formula $\mathrm{C}_{4} \mathrm{H}_{9} \mathrm{Br}$ .

Give the structure of the $\mathrm{C}_{4} \mathrm{H}_{9} \mathrm{Br}$ bromoalkane that would react fastest with aqueous silver nitrate in ethanol.

The fastest reacting bromoalkane is the tertiary bromoalkane with structure $\ce{(CH3)3CBr}$ , i.e. 2-bromo-2-methylpropane.

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10.12—The trend in reactivity of primary, secondary and tertiary halogenoalkanes question 1