CN-

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JChen_2I
Posts: 107
Joined: Fri Aug 09, 2019 12:17 am

CN-

Postby JChen_2I » Tue Nov 05, 2019 5:06 pm

Does CN- have a triple bond? If yes, why a triple bond and not a double bond with 2 lone pairs on nitrogen?

Victoria Zheng--2F
Posts: 103
Joined: Fri Aug 09, 2019 12:17 am

Re: CN-

Postby Victoria Zheng--2F » Tue Nov 05, 2019 5:10 pm

CN- does have a triple bond. If CN- has a double bond, then there would not be enough valence electrons to fulfill the octet on both carbon and nitrogen because there are only 10 electrons in total, and for a double bond, 12 electrons are needed.

Pegah Nasseri 1K
Posts: 100
Joined: Wed Feb 27, 2019 12:15 am

Re: CN-

Postby Pegah Nasseri 1K » Tue Nov 05, 2019 5:21 pm

Yes, CN- has a triple bond. There are 10 valence electrons in total. Using a double bond would not fulfill the octet rule for carbon. Nitrogen would have a formal charge of -1 if it had 2 lone pairs. However, in this case the Carbon has to take the formal charge of -1 in order for it to have an octet for all the valence shells to be full. So using a triple bond ensures that both elements has an octet.


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