Match each number to its corresponding letter.
1. number of different organic compounds a) coal
2. major source of medicine b) 1,000,000 +
3. major problem in burning soft coal c) coke
4. residue of coal decomposition d) pollution
5. first organic compound synthesized e) urea

The correct matches are as follows:

1. number of different organic compounds
B) 1,000,000 +  

2. major source of medicine 
A) coal 

3. major problem in burning soft coal
D) pollution 

4. residue of coal decomposition 
C) coke 

5. first organic compound synthesized
 E) urea 

Hope this answers the question. Have a nice day.

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