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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.
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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