What is the formal charge on ' $\mathrm{N}$ ' atom in $[: \ddot{\mathrm{S}}-\mathrm{C} \equiv \mathrm{N}…

What is the formal charge on ' $\mathrm{N}$ ' atom in $[: \ddot{\mathrm{S}}-\mathrm{C} \equiv \mathrm{N} \text { : }]^{\ominus}$ ion?
  1. zero
  2. +3
  3. -2
  4. +2

Solution

Formal charge$=\left[\begin{array}{l}\text { Total no. of } \\ \text { valence } \mathrm{e}^{-} \\ \text {in freestate }\end{array}\right]-\left[\begin{array}{l}\text { Total no. of } \\ \text { lonepair } \\ \text { electrons }\end{array}\right]-\frac{1}{2}\left[\begin{array}{l}\text { no. of bonding } \\ \text { electronson that } \\ \text { particularatom }\end{array}\right]$ $[\because \ddot{\mathrm{S}}-\mathrm{C} \equiv \mathrm{N}:]^{-}$ Formalcharge of $\mathrm{N}-$ atom $=5-2-\frac{1}{2} \times 6=$ zero

Asked in: MHT CET 2021 (24 Sep Shift 2)

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