Who among the following was the Commander in chief of Indian Army in the Interim Government formed in 1946-47?

Sir Claude Auchinleck

The correct answer is Option 3 - Sir Claude Auchinleck

The Interim Government of India, formed in 1946, had several key ministers who held important posts. Here are some of the prominent ministers and their respective posts in the Interim Government:

Viscount Wavell - Viceroy and Governor-General of India
Commander-in-Chief - Sir Claude Auchinleck
Jawaharlal Nehru - Vice President, External Affairs and Commonwealth Relations
Sardar Vallabhbhai Patel - Home Affairs and Information and Broadcasting
Rajendra Prasad - Food and Agriculture
Liaquat Ali Khan - Finance
Jagjivan Ram - Labour
John Mathai (from October 1946) (initially C. Rajagopalachari) - Industries and Supplies
Sardar Baldev Singh - Defence
Asaf Ali initially, Abdul Rab Nishtar (from October 1946) - Railways and Communications Post and Air
Ghaznafar Ali Khan (from October 1946) (initially C. Rajagopalachari) - Health
C.H. Bhabha initially      Ibrahim Ismail Chundrigar (from October 1946) - Commerce
C. Rajagopalachari - Education