How can i identify a ionic and molecular compound?

Compounds containing two elements (so called binary compounds) can either have ionic or covalent bonding. If a compound is made from a metal and a non-metal, its bonding will be ionic. If a compound is made from two non-metals, its bonding will be covalent.
 
But on molecular compounds I'm not so sure. I hope I helped!~
  

An ionic compound is formed when a metal combines with a nonmetal or a metalloid. A molecular compound is formed when two nonmetals combine with each other.
Hope this helps~

Combustion is the act or process of burning. therefore, i believe the answer is  a: burning wood.