It should be noted that there are three ways to give divorce
1) Talaq -e- Ahsan: Single Talaq-e-Rajai (Pronouncement of divorce that can be reverted) is given to women after she becomes pure and before any sexual intercourse is performed. In the case a person can revert during iddat (waiting period) and can do the nikah again. This is considered as the best approach
2) Talaq-e-Hassan: Pronounce divorce three times in three separate intervals between menstruation (Tuhr). This is also permissible way but Nikah cannot be done without doing Sharari Halala
3) Talaq -e- Bad'i: Pronounce divorce during menses or during tuhr in which sexual intercourse also happened or pronounce divorce three times in one sitting or in a single tuhr. This way divorce will occur but the person will be sinful. The Nikkah cannot be done without doing Halal in accordance with Shariah