After becoming deputy prime minister, the first person to become prime minister isACharan SinghBJagjivan RamCY B ChavanDMorarji DesaiAnswer: D. Morarji Desai Read Explanation: First Deputy PRIME Minister to die while in office: Sardar Patel First Deputy Prime Minister to resign: Morarji Desai Cabinet that had two deputy prime ministers at the same time: Morarji Desai cabinet Read more in App