Explanation:

Robert Clive was a soldier and first British administrator of Bengal, who was one of the creators of British power in India. In his first governorship (1755–60) he won the Battle of Plassey and became master of Bengal. In his second governorship (1764–67) he reorganized the British colony. Statement 1 is incorrect: Robert Clive was made the Governor of Bengal twice from 1757 to 1760 and then from 1765 to 1767. He administered Bengal under the dual government system till his return to England where he allegedly committed suicide in 1774.
1) Robert Clive was the first governor of Bengal. The first Governor-General of Bengal was Warren Hastings and the first Governor-General of British India was Lord William Bentinck and the first Governor-General of the Dominion of India was Lord Mountbatten.
Statement 2 is correct: Robert Clive was the commander of English forces in the battle of Plassey. The arrival of a strong force under the command of Robert Clive at Calcutta from Madras strengthened the English position in Bengal. Clive forged a secret alliance with the traitors of the Nawab Siraj-ud-Daulah -

Mir Jafar, Rai Durlabh, Jagat Seth (an influential banker of Bengal) and Omichand. Under the deal, Mir Jafar was to be made the nawab that in turn would reward the Company for its services. The secret alliance of the Company with the conspirators further strengthened the English position.
Statement 3 is correct: Robert Clive concluded two important treaties at Allahabad in August 1765, one with the Nawab of Awadh and the other with the Mughal Emperor, Shah Alam II. Nawab Shuja-ud-Daula agreed to:
1) Surrender Allahabad and Kara to Emperor Shah Alam II;
2) Pay Rs 50 lakh to the Company as war indemnity;
3) Give Balwant Singh, Zamindar of Banaras, full possession of his estate.
Shah Alam II agreed to:
1) Reside at Allahabad, to be ceded to him by the Nawab of Awadh, under the Company’s protection;
2) Issue a farman granting the diwani of Bengal, Bihar and Orissa to the East India Company in lieu of an annual payment of Rs 26 lakh; and
3) A provision of Rs 53 lakh to the Company in return for nizamat functions (military defence, police, and administration of justice) of the said provinces.