Explanation:

- Alivardi Khan died in 1756, marking a notable shift in leadership for Bengal.

- Siraj-ud-daulah:

- Grandson of Alivardi Khan.

- Became the Nawab of Bengal post Alivardi Khan's death in 1756.

- Murshed Quli Khan:

- First Nawab of Bengal under Mughal rule.

- His period was much earlier than 1756.

- Mir Jafar:

- Initially a military general in Alivardi Khan's regime.

- Became Nawab later, after betrayal in the Battle of Plassey.

- Mir Qasim:

- Succeeded Mir Jafar as Nawab later on.

- His reign was after Siraj-ud-daulah.