Question

for which value of n are these graph regular
kn cn wn qn

Answer 1

Kn is a complete graph
Wn is wheel graph
Cn is cyclic graph
Qn is bipartite .

Kn is always regular for all n ..   graph of degree n-1.
Cn is always regular for all n values...  graphs of degree 2
Wn is regular for n = 3   .   degree 3.  
Qn is regular for all n.         of degree n