In what kingdom do mango belong?

Answer 1

Anacardiaceae.

"Anacardiaceae (the cashew family or the sumac family) is a family of flowering plants bearing fruits that are drupes and in some cases producing urushiol, an irritant. Its numerous genera include several of economic importance. Notable plants in this family include cashew (in the type genus Anacardium), mango, poison ivy, sumac, smoke tree, marula and pistachio."
http://en.wikipedia.org/wiki/Anacardiaceae