Option-1 states that solar noon occurs simultaneously at locations with the same longitude. This is correct because solar noon is defined as the time when the sun is at its highest point in the sky, and this occurs at the same time along a specific longitude.

Option-2, which is the correct answer, states that one meridian, directly under the sun, experiences solar noon at a given time. This is incorrect because solar noon does not occur at the same time for all locations on a meridian, but rather it occurs at different times as you move along the meridian.

Option-3 states that places with the same longitude experience solar noon at different times. This statement is correct as solar noon occurs at different times as you move from east to west along a specific longitude.

Option-4 states that solar noon occurs at different times at locations with the same latitude. This statement is incorrect as solar noon occurs at the same time for locations along the same latitude line.

In summary, option-2 is the correct answer because solar noon does not occur at the same time for all locations on a meridian.