There are many young people who do not pray Jumu’ah; instead they pray Zuhr (four rak'ahs) because the conditions for Jumu’ah prayer are not met as there is no khaleefah
They are doing wrong by not praying Jum’ah, and by praying Zuhr instead, because the existence or permission of a khaleefah is not a condition for Jumu’ah to be obligatory or valid, according to the scholars of Ahl al-Sunnah wa’l-Jamaa’ah.
