Two molecules having same molecular formula are drawn for your reference

Choose the correct statements :

Pair of molecules in Set-I are structural isomers of each other

At least one molecule in Set-I can exhibit optical isomerism

A molecule represents facial and B represents meridonial isomer of the type $\left[M{a}_3{b}_3\right]$

Set-II molecules have one more stereo isomer which is optically inactive