Q 1: What is the ruling if a person performs
Wudu' (ablution) before Istinja' (cleansing the private parts with water after urination or defecation)?
All Praise is due to Allah Alone and peace and blessings be upon His Messenger, his family, and Companions.
In case of doing exactly as mentioned in the question, this Wudu' is not valid. This is because one of the conditions of the validity of Wudu' is that it should be preceded by Istinja' or Istijmar (cleansing the private parts with hard material after urination or defecation) according to the most proper one of two opinions of scholars.