JEE MainChemistryChemical Bonding and Molecular Structure
Given below are two statements: Statement I: During the ionization of NO to NO ⁺ , the bond length decreases and the magnetic nature changes from paramagnetic to diamagnetic. Statement II: Among the species PCl ₅ , PCl ₄⁺ and PCl ₆⁻ , only PCl ₅ possesses unequal P - Cl bond lengths. In the light of the above statements, choose the correct answer from the options given below.
Options
- ABoth Statement I and Statement II are false
- BBoth Statement I and Statement II are true
- CStatement I is true but Statement II is false
- DStatement I is false but Statement II is true
Correct answer
B. Both Statement I and Statement II are true
Step-by-step solution
Statement I: The total number of electrons in NO is 15 . According to Molecular Orbital Theory, its configuration has one unpaired electron in the antibonding ^ * molecular orbital, making it paramagnetic with a bond order of 10 - 5 2 = 2.5 . When NO ionizes to NO ⁺ ( 14 electrons), the electron is removed from the antibonding ^ * orbital. The new bond order becomes 10 - 4 2 = 3.0 . Since all electrons are now paired, NO ⁺ is diamagnetic. An increase in bond order from 2.5 to 3.0 results in a decrease in bond lengt