Pseudohalides

Q. Which of the following is not a pseudo halide?

1. $C{N}^{-}$
2. $OC{N}^{-}$
3. $O{H}^{-}$
4. $SC{N}^{-}$

Q.

Among the following, which qualifies as a pseudohalogen?

1. Cyanide

2. Oxygen

3. Cyanogen

4. Oxygen

Q.

Among the following, which qualifies as a pseudohalogen?

1. Cyanide

2. Oxygen

3. Cyanogen

4. Oxygen