The transition metal ions responsible for color in ruby and emerald are, respectively :

A solid XY kept in an evacuated sealed container undergoes decomposition to form a mixture of gases X and Y at temperature T. The equilibrium pressure is 10 bar in this vessel. K_p for this reaction is :

The “N” which does not contribute to the basicity for the compound is :

Bromination of cyclohexene under conditions given below yields :