Which of the following orders is not correct with respect t…

Chemistry S and P - Block Elements (S - Block Elements Not In Syllabus ) Mix Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 13, 2026

Which of the following orders is not correct with respect to the property indicated against each ?

F < Cl < Br < I ⎯→ covalent radius

F – > Cl – > Br > I – ⎯→ enthalpy of hydration

F 2 > Cl 2 > Br 2 > I 2 ⎯→ bond dissociation enthalpy

F 2 < Cl 2 < Br 2 < I 2 ⎯→ X–X bond length (pm)

Text Solution

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The correct answer is:

64 < 99 < 114 < 133 – covalent radius/pm down the group size increases due to addition of new shells.

515 > 391 > 347 > 305 – Δ hyd H(X – ) KJ mol –1

Degree of hydration ∝ s

158.8 < 242.6 > 192.8 > 1.51 |-Bond dissociation enthalpy | (kJ mol –1 ) F–F < Cl–Cl on account of large repulsion between non-bonded pairs of electron due to small F-F bond length.

143 < 199 < 228 < 266 – X – X distance/pm as size of element increases the X-X distance increases

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