Does a divorce pronounced by a father on behalf of his son by virtue of a general power of attorney take effect, and what is the ruling of Islamic law on this, and how can this power of attorney be revoked without disobeying one's parents?

The fundamental principle in contracts is to consider intentions and objectives. If your intention behind the general power of attorney for your father was to authorize him in matters of buying, selling, and similar worldly affairs, but not divorce, then the divorce will not take effect if he divorces you, because intention is the basis. Ibn Abbas said, "Divorce is from a state of desire."

If there is nothing suspicious from your father, then maintain your power of attorney. However, if anything suspicious appears from him, such as disposing of your properties without your permission, you have the right to revoke the power of attorney immediately and officially document the revocation. This is not considered disobedience. You can seek assistance from experts to document a specific power of attorney that limits your father's authorities.