What is the formal charge on carbon atom in the following two structures?

0, - 2

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0, 0

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+ 2, - 2

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+ 1, - 1

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Solution

The correct option is C $0, 0$
To calculate the formal charge = Valence electrons $-$ No. of bonds + 2 $\times$ lone pairs.

For $C S_{2}$ molecule,
Valence electrons of carbon $= 4$ and No. of bond $= 4$ , lone pairs $= 0$
Thus, formal charge $= 4 - [4 - 2 \times 0] = 0$

For $C O_{3}^{- 2}$ molecule,
Valence electrons of carbon $= 4$ , No. of bonds $= 4$ , lone pairs $= 0$
Thus, formal charge $= 4 - [4 - 2 \times 0] = 0$

Hence, the correct answer is option $B$ .

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(i)

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