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Edexcel A-Level Chemistry AS 10.13 Understand in Terms of Bond Enthalpy the Trend in Reactivity of Chloro Bromo and Iodoalkanes Questions

Compare C–Cl, C–Br and C–I strengths directly: the weaker lower-enthalpy bond breaks more readily, so the iodoalkane hydrolyses fastest.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
AS

Exam points

  • Rank hydrolysis as iodoalkane faster than bromoalkane faster than chloroalkane.
  • Justify the order using decreasing C–X bond enthalpy rather than polarity or solubility.

Edexcel A-Level Chemistry AS 10.13 Understand in Terms of Bond Enthalpy the Trend in Reactivity of Chloro Bromo and Iodoalkanes Questions question 1

[Maximum number: 2]

This question is about halogenoalkanes.

The rates of hydrolysis of 1-chloropropane, 1-bromopropane and 1-iodopropane in reactions with aqueous silver nitrate solution were compared.

State which of these halogenoalkanes would hydrolyse the fastest. Justify your answer.

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