Question

Who is the best friend of yours?
(Change into imperative)

Answer 1

I think there should be
who is your best friend?

Answer 2

Answer:

Tell me the name of your best friend.

Explanation:

Here, the given sentence is Interrogative Sentence.

The imperative sentence should be started with main verb.

Here, we can take 'Tell' as main verb as in the question it is asked like an order.