Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEET2021ChemistryChemical Bonding and Molecular StructureActual

The correct sequence of bond enthalpy of ' C - X bond is:

Options

  1. ACH 3 - F < CH 3 - Cl < CH 3 - Br < CH 3 - I .
  2. BCH 3 - F > CH 3 - Cl > CH 3 - Br > CH 3 - I
  3. CCH 3 - F < CH 3 - Cl > CH 3 - Br > CH 3 - I
  4. DCH 3 - Cl > CH 3 - F > CH 3 - Br > CH 3 - I

Correct answer

B. CH 3 - F > CH 3 - Cl > CH 3 - Br > CH 3 - I

Step-by-step solution

Bond enthalpy is inversely proportional to the bond length. The bond length order of C - X bond in methyl halides depends on the size of the halogen atom. Bond length order: CH 3 - F < CH 3 - Cl < CH 3 - Br < CH 3 - I Hence, bond enthalpy order is CH 3 - F > CH 3 - Cl > CH 3 - Br > CH 3 - I

Practice Chemical Bonding and Molecular Structure on Quantrex Academy →

More from Chemical Bonding and Molecular Structure

Which of the following molecules shows sp ^3 d hybridisation? 2026Identify a pair of molecules having zero dipole moment. 2026Identify the correct decreasing order of lattice enthalpy for metal fluorides from following. 2026Which of the following bonds is expected to be the most polar? 2026Which of the following species is paramagnetic? 2026What is the number of bonding and antibonding electrons, respectively, in Li ₂ molecule? 2026What is the number of electrons in bonding molecular orbitals and antibonding molecular orbitals respectively in F ₂ molecule? 2026Identify the hybridization in BF ₃ molecule. 2026 Full Chemical Bonding and Molecular Structure list All NEET PYQs