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COMEDK2024Evening ShiftChemistryChemical Bonding and Molecular StructureActual

Choose the incorrect statement from the following: A. Isoelectronic molecules/ions have the same bond order. B. Dipole moment of NH ₃ is greater than that of NF ₃ . C. The Carbon in Methyl Carbocation is sp ^3 hybridised. D. The stability of an ionic compound is measured in terms of its lattice enthalpy and not simply based on attaining Octet configuration.

Options

  1. AB
  2. BC
  3. CA
  4. DD

Correct answer

B. C

Step-by-step solution

A. Correct: Isoelectronic species like N₂ , CO , CN^- , NO^+ all have bond order 3 — this holds for many common pairs. B. Correct: In NH₃ , N-H bond dipoles and the lone pair dipole reinforce each other. In NF₃ , the N-F bond dipoles oppose the lone pair dipole, partially canceling it. Hence (NH₃) > (NF₃) . C. Incorrect: The carbon in methyl carbocation ( CH₃^+ ) has 3 sigma bonds and one empty p-orbital — it is sp^2 hybridised with trigonal planar geometry, not sp^3 . D. Correct: The stability of an ionic compound

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