4. Your friend's marriage is not valid. If your friend can properly contest case of his marriage then via Court he can get divorce.
in this case, divorce is not applicable.
legal & valid marriage is required to get divorce.
ur friend should file petition u/s 11 of HMA, requesting the court to declare his marriage void.
he needs to hurry up & file the petition ASAP for the following reasons -
1) if his wife first files any case under HMA, (RCR / Judicial separation) & then ur friend files case u/s 11, his case will be transferred to the court where wife has first filed her case.
2) if he files petition u/s 11 and then his wife files DV / 498a, it will be treated as afterthought.
in this case of void marriage, ur friend even does not need to send a legal notice to the wife.
read the highlighted pts. in the following case :