-- Latitude is measured north and south from the equator, not east.
-- Latitude can't be greater than 90 degrees, north or south.
-- 100 degrees east would be a legitimate longitude, but it extends from the north pole
to the south pole. There's a lot of stuff along that line, including big parts of Russia, China,
and Antarctica.
The question strikes out on all of these counts, and is thus essentially indecipherable.
Thailand
There is no such place as the maximum degree of latitude is only 90.
There is no such coordinate as 100 degrees latitude, either north or south. The maximum latitude number is 90 degrees, at the north and south poles.
There is no such latitude as "150 degrees north". The greatest possible north latitude is 90 degrees . . . at the north pole.
China
Russia
Thailand
Bangkok, Thailand.
Thailand.
There is no such place as the maximum degree of latitude is only 90.
There is no such coordinate as 100 degrees latitude, either north or south. The maximum latitude number is 90 degrees, at the north and south poles.
Gulf of Thailand
It is the Gulf of Thailand, or Gulf of Siam.
There is no such latitude as "150 degrees north". The greatest possible north latitude is 90 degrees . . . at the north pole.
40 degrees north 100 degrees east
Since you did not specify the directions of the latitude and longitude lines, the best assumption would be 15 degrees north latitude and 100 degrees east longitude. However, there is no capital city located there, and none at the other combinations. It is actually Chainat province in Thailand.
The Asian continent is located at this intersection of longitude and latitude.