canadian immigration with US application pending

[ppn33]

I was born in India and am currently working in US on H1B visa. I will move to Toronto, Canada next year. I had following questions regarding immigration:
1. Can I apply for US Green card (permanent residence) now and move to Canada next year with my US application pending?
2. Can I apply for Canadian citizenship next year eventhough my application in US might be pending at that time.
3. Can I have citizenship from India, US and Canada at the same time. If not, where should I apply first, US or Canada

[ppn33]

I meant Canadian PR and not citizenship. Can I apply for one if my US PR application is pending or vice versa?