Question

Draw a complete Lewis structure for the conjugate acid of nitromethane that shows all bonds, unshared electron pairs, and minimized formal charges, where appropriate.

Answer 1

Answer:

Lewis structures are shown below

Explanation:

• In Lewis structure of nitromethane, a negative charge is present on oxygen atom in nitro group.
• Hence this oxygen atom acts as a basic center preferably.
• Therefore conjugate acid of nitromethane should be drawn by adding a hydrogen atom with this oxygen atom.
• Lewis structure of nitromethane as well as it's conjugate acid has been shown below including all the lone pairs and formal charges

Answer 2

 CH3-N=O, [with one more O attached to N] <=====> CH2=N-O- + H+ ; this negative charge on O can be with the other O too, thus it gets stabilises itself.This is called the conjugate acid, as it has lost a proton. This is called Nitro- Acinitroso tautomerism .


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