Explanation:
Shivaji's coronation took place in 1674, and we need to determine which of the given options was not alive at that time. Let's analyze each option:

a) Ganga Bhat:
Ganga Bhat was a poet and historian who lived during the reign of Shivaji. He was a contemporary of Shivaji and wrote extensively about his life and achievements. Therefore, Ganga Bhat was alive at the time of Shivaji's coronation.

b) Tukaram:
Tukaram was a prominent poet-saint and philosopher who lived during the 17th century. He was a devotee of Lord Vitthal and composed numerous devotional songs in Marathi. Tukaram was also a contemporary of Shivaji and passed away in 1649, which is before Shivaji's coronation in 1674. Therefore, Tukaram was not alive at the time of Shivaji's coronation.

c) Dadaji Kondadeo:
Dadaji Kondadeo, also known as Dadaji Konddev, was a trusted advisor and close associate of Shivaji. He played a crucial role in Shivaji's administration and military campaigns. Dadaji Kondadeo was alive during Shivaji's reign and was present at the time of Shivaji's coronation. However, this option is incorrect as we are looking for the option that was not alive at the time of Shivaji's coronation.

d) Ram Das:
Ram Das was a spiritual leader and the guru of Shivaji. He was known for his teachings on spirituality and righteousness. Ram Das was alive during Shivaji's reign and was present at the time of Shivaji's coronation. Therefore, Ram Das was alive at the time of Shivaji's coronation.

Conclusion:
Among the given options, Tukaram was not alive at the time of Shivaji's coronation in 1674.