Question

why flame is produced ​

Answer 1

Here is your answer ⤵⤵⤵

This is due to incandescence of very fine soot particles that are produced in the flame. With increasing oxygen supply, less black body-radiating soot is produced due to a more complete combustion and the reaction creates enough energy to excite and ionize gas molecules in the flame, leading to a blue appearance.

HOPE IT HELPS YOU ☺☺!!!

Answer 2

Flame is produced due to incandescence (to produce light through heat) of very fine soot particles in a thin zone.