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.
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.
For the carbon 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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