Under which Sultan of Delhi, Muhammad Bin Tughlaq had worked before becoming the ruler?

Ain-ul-Mulk Multani did not serve under which of the following rulers?

Who was the last ruler of the Tughluq dynasty of the Delhi Sultanate?

Which Sultan of Delhi assumed the title of Alexander the Great –

Which dynasty of Delhi Sultanate ruled for the shortest period?

Which period is called the era of “the rule of the Forty” in the history of Delhi Sultanate age?