"I bought oranges and apples."

Is «Я купил апельсинов и яблок» incorrect? I think, it's correct. По крайней мере, так и говорят :)

@ Francesco. Because the action is complete, otherwise you would have translated it 'I was buying' instead of 'I bought'

Why is imperfective not used here and not even acceptable? That makes me confusion, I thought I understood.