Identify the species having one $$\pi$$-bond and maximum number of canonical forms from the following :

Which one of the following metals forms interstitial hydride easily?

Maleic anhydride can prepared by :

Given below are two statements :

Statement I : Chlorofluoro breakdown by radiation in the visible energy region and release chlorine gas in the atmosphere which then reacts with stratospheric ozone.

Statement II : Atmospheric ozone reacts with nitric oxide to give nitrogen and oxygen gases, which add to the atmosphere.

For the above statements choose the correct answer from the options given below :