Question: who has held the office for chief minister for the longest time
Answer: y Kumar Mukherjee Tamluk 2 April 1971 25 June 1971 84 days ( total : 2 years , 139 days ) Sixth Assembly ( 1971 ) ( March 1971 election ) Indian National Congress -- Vacant ( President 's rule ) 25 June 1971 19 March 1972 268 days Dissolved N / A 5 Siddhartha Shankar Ray Malda 20 March 1972 30 April 1977 7003186700000000000 ♠ 5 years , 41 days Seventh Assembly ( 1972 -- 77 ) ( March 1972 election ) Indian National Congress -- Vacant ( President 's rule ) 30 April 1977 20 June 1977 51 days Dissolved N / A 6 Jyoti Basu Satgacchia 21 June 1977 23 May 1982 7003853800000000000 ♠ 23 years , 137 days Eighth Assembly ( 1977 -- 82 ) ( June 1977 election ) Communist Party of India ( Marxist ) ( Left Front ) 24 May 1982 29 March 1987 Ninth Assembly ( 1982 -- 87 ) ( May 1982 election ) 30 March 1987 18 June 1991 Tenth Assembly ( 1987 -- 91 ) ( March 1987 election ) 19 June 1991 15 May 1996 Eleventh Assembly ( 1991 -- 96 ) ( May 1991 election ) 16 May 1996 5 November 2000 Twelfth Assembly ( 1996 -- 2001 ) ( May 1996 election ) 7 Bud