Question

rainbows are seen in the afternoon. Is it possible to view a rainbow in the morning

Answer 1

Yes,Rainbow is seen due to the dispersion of light
Even you can use artificial light to see the spectrum

Answer 2

Yes.

You usually can only see rainbows in the morning and afternoons before the sun is too high in the sky.The lower the sun the higher in the sky the rainbow will be.

Hope this helps!