KCET · Chemistry · Aldehydes and Ketones
Which of the following is the correct electron dot structure of \( \mathrm{N}_{2} \mathrm{O} \) molecule ?
- A \( : \mathrm{N}=\mathrm{N}=\ddot{\mathrm{O}} \)
- B \( : \mathrm{N}=N^{+}-\ddot{\mathrm{O}}: \)
- C \( : \ddot{N}=N=N=O-O-N=\ddot{O} \)
- D \( : \ddot{N}-\mathrm{N}=\ddot{O} \)
Answer & Solution
Correct Answer
(B) \( : \mathrm{N}=N^{+}-\ddot{\mathrm{O}}: \)
Step-by-step Solution
Detailed explanation
Electron dot structure of \(\mathrm{N}_{2} \mathrm{O}\) molecule
First draw the main skeleton structure of \(\mathrm{N}_{2} \mathrm{O}\) having \(\mathrm{N}-\mathrm{N}-\mathrm{O}\) connectivity with single bonds without showing any formal charge, that is,
Total number of valence electrons \(=(5 \times 2)+(6 \times 1)=16 e^{-} s\)
Four electrons are used to form two bonds in the skeleton structure
Remaining valence electrons \(=16-4=12\)
The central nitrogen atom needs two more lone pairs, terminal nitrogen atom needs three more lone pairs and oxygen
atom needs three more lone pairs to complete their octet.
Therefore, total 16 electrons are needed. But we have 12 electrons.
Hence, 2 additional bonds are formed, which can be placed in three different ways,
The most appropriate structure of \(N_{2} O\) is
The resonating structures of \(\mathrm{N}_{2} \mathrm{O}\) are as follows:
First draw the main skeleton structure of \(\mathrm{N}_{2} \mathrm{O}\) having \(\mathrm{N}-\mathrm{N}-\mathrm{O}\) connectivity with single bonds without showing any formal charge, that is,
Total number of valence electrons \(=(5 \times 2)+(6 \times 1)=16 e^{-} s\)
Four electrons are used to form two bonds in the skeleton structure
Remaining valence electrons \(=16-4=12\)
The central nitrogen atom needs two more lone pairs, terminal nitrogen atom needs three more lone pairs and oxygen
atom needs three more lone pairs to complete their octet.
Therefore, total 16 electrons are needed. But we have 12 electrons.
Hence, 2 additional bonds are formed, which can be placed in three different ways,
The most appropriate structure of \(N_{2} O\) is
The resonating structures of \(\mathrm{N}_{2} \mathrm{O}\) are as follows:
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