Question

combustion of Hydrocarbons is generally accompanied by​

Answer 1

HERE'S YOUR ANSWER
⬇⬇⬇⬇⬇⬇⬇⬇

Oxygen.

For any combustion, presence of oxygen is necessary. Without it , combustion cannot occur .

Answer 2

combustion of Hydrocarbons is generally accompanied by​ evolution of  heat and light.

hope it helps u...