If Hund rule violates, then find the total number of species among following which will be diamagnetic :

Question

If Hund rule violates, then find the total number of species among following which will be diamagnetic :
$B_2, O_2, N_2^-, C_2, NO, OF, N_2^{2-}, BN$

Prashant Kotian · Accepted Answer

Correct answer: 5

**SOLUTION:** IF HUND'S RULE IS VIOLATED, ELECTRONS PAIR UP IN DEGENERATE ORBITALS. SPECIES WITH AN EVEN NUMBER OF ELECTRONS WILL BE DIAMAGNETIC: $B_2, O_2, C_2, N_2^{2-}, BN$ (TOTAL = 5).. Step 1: Write down the connectivity of disulfur dichloride (S2Cl2): Cl-S-S-Cl. Step 2: Each sulfur atom has 2 bond pairs and 2 lone pairs (sp3 hybridized), which creates a non-planar open-book structure. Step 3: This open-book conformation is directly analogous to the structural conformation of hydrogen peroxide (H2O2, H-O-O-H), matching option (d).

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