Where is the world's largest conventional reflecting telescope with a single primary mirror located?

The world's largest conventional reflecting telescope with a single primary mirror is located at the Mauna Kea Observatory in Hawaii. This telescope, known as the Keck Observatory, features a primary mirror measuring 10 meters in diameter and is part of a pair of telescopes that take advantage of the high elevation and clear skies of Mauna Kea.

The location is particularly significant for astronomical research due to its optimal atmospheric conditions, which minimize light pollution and atmospheric disturbances. This allows for highly detailed observations of celestial objects. The Keck telescopes have contributed greatly to various fields of astronomy, including deep space exploration and the study of distant galaxies.

While options like Greenwich Observatory, Mount Everest Observatory, and Palomar Observatory may have their own notable telescopes and contributions to astronomy, the largest single primary mirror in a conventional reflecting telescope is specifically attributed to Mauna Kea, making it the correct choice.