CN^(-) ion is known but CP^(-) ion is not known.

1.	CN^(-) ion is known but CP^(-) ion is not known.
Answer» Solution :Due to smaller SIZE and HIGHER electrongeativity of N than of P, N can form `ppi-ppi` multiple BONDS with C and hence forms `CN^(-)` ion. On the other hand, due to bigger size and lower electronegativity of P than that of N, P does not form multiple bonds with C and hence does not form `CP^(-)` ion. `underset(("Exists"))(""^(-):C-=N)""underset(("Does not EXIST"))(""^(-):C-=P)`

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