Arrange the following leaders in chronological order based on their birth year:

1) Bhimrao Ramji Ambedkar
2) Abul Kalam Azad
3) Deen Dayal Upadhyaya
4) Rafi Ahmed Kidwai

2-1-4-3

Important Leaders of India and their life span:

Abul Kalam Azad (1888-1958)
Rajkumari Amrit Kaur (1889-1964)
Acharya Narendra Dev (1889-1956)
Bhimrao Ramji Ambedkar (1891-1956)
Rafi Ahmed Kidwai (1894-1954)
Shyama Prasad Mukherjee (1901-1953)
A.K. Gopalan (1904-1977)
Deen Dayal Upadhyaya (1916-1968)