Draw the best lewis structure for ch3-1. what is the formal charge on the c?

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The most preferred Lewis structure of [CH3] is given below.

best lewis structure of CH3-

The preferred or best Lewis structure for [CH3] has a total of 8 valence electrons. The central carbon atom is bonded to three hydrogen atoms via single bonds, and it also has a lone pair of electrons.

Now we need to determine the formal charge on the C atom for the above CH3 lewis structure.

To calculate the formal charge on the central carbon atom, we use the formula given below:

Formal charge = valence electrons – non-bonding electrons – 1/2 * bonding electrons.

formal charge formula

For the carbon atom in [CH3]

calculating formal charge on carbon (C) atom in CH3-

Valence electrons of carbon = 4 (since it is in Group IV A)

⇒ Bonding electrons = 3 single bonds = 3 (2) = 6 electrons

⇒ Non-bonding electrons = 1 lone pair = 2 electrons

⇒ Formal charge on the carbon atom = 4 – 2 – 6/2 = 4 – 2 – 3 = -1

∴ Therefore, the formal charge on the central carbon atom in [CH3] is -1.

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