$\begin{array}{1 1}(a)\;\text{the same with 1,1 and 1 lone pairs of electrons respectively}\\(b)\; \text{different with 1,0 and 2 lone pairs of electrons respectively}\\(c)\;\text{different with 0,1 and 2 lone pairs of electrons respectively}\\(d)\;\text{the same with 2,0 and 1 lone pairs of electrons respectively}\end{array}$