I am trying to solve your needs,
Your question no. 1: - Yes, it is mandatory to give you the acceptance of resignation letter to you within 1 week or in between your ending period.
Your question no. 2:Your leaves are subject to sanction of management. if the management sanction the same, you can adjust it but sanction of management is mandatory
Your question no. 3 doesn't get the right meaning of your question
thanks and wish you all the best for your future endeavors
22nd August 2008 From India, Mumbai