Answer:
my answer would be yes... that is because if you think about it there is no sharp/flat between e and f, nor b and c, so it depends on how you want to look at it... b# is the same as c and Cb is the same as B... its just a matter of perception, a B# major scale should be the same as a C major scale and a Cb major scale should be the same as a B major scale
Explanation:
Perfect fifth because you are going from do to so which is 5 steps apart :) so do to ti would be a perfect seventh since theyre seven steps apart. a perfect octave would be do to do.