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A-LevelChemistryHalogen derivatives9701/12 · May/June 2025 · Q331 Mark

Four drops of 1-chlorobutane, 1-bromobutane and 1-iodobutane are put separately into three test-tubes containing 1.0 cm³ of aqueous silver nitrate at 60°C. In each case, a hydrolysis reaction occurs. H2O(l) + R–X(l) + Ag⁺(aq) → R–OH(aq) + AgX(s) + H⁺(aq) R represents C4H9 and X represents the halogen atom. The rate of formation of cloudiness in the test-tubes is in the order RCl < RBr < RI. Why is this?

AThe bond energy of R-X decreases from RCl to RI.
BThe first ionisation energy of the halogen decreases from Cl to I.
CThe solubility of AgX(s) decreases from AgCl to AgI.
DThe R-X bond polarity decreases from RCl to RI.

✓ Correct answer

A: The bond energy of R-X decreases from RCl to RI.

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About this question

Topic
Halogen derivatives, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source
A-Level Chemistry, May/June 2025 Paper 1 Variant 2, question 33.

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