Which of the following is not one of the three largest sources of materials needed to form carbon compounds?
natural gas
petroleum
coal
wood

WOOD is not one of the three largest sources of materials needed to form carbon compounds. So the answer is wood.

Hope this helps :)

The correct answer is option D, wood

Explanation:

The three major source of carbon on earth are – coal , petroleum and natural gas

Several carbon based products are formed from these three source after  processing. For example – coke and charcoal are produced from coal, like wise ink and paints also have coal as one of the constituents substance. Carbon black is also extracted from coal. Similarly,  from petroleum all lubricating oils and wax are derived using distill filtration.  

c. orbital shape i hope this is correct