How should we find the number of electron pairs in a molecule like C2H2 using the formula (V+L+A-C)÷2.

WHERE V= VALENCE ELECTRONS,.

L=LIGANDS,.

A=ANIONIC CHARGE,

C=CATIONIC CHARGE,...???

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Solution

Get hybrid orbitals first-

1/2[V+M+A-C]

Where,

V-valence electrons of main atom

M-Monovalent atoms(H,F,Cl,Br,I)

A-Anionic charge(if any)

C-cationic charge(if any)

Then finally,

Lone pairs= hybrid orbitals-attached atoms.

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