Match these items.
1. from decomposition of coal
2. triple bond
3. hard, three dimensional
4. major source of today's medicine
5. double bond
6. soft, two dimensional
7. saturated hydrocarbon series
8. major reaction type for alkanes
9. soot, carbon black
combustion
coke
diamond
alkane
graphite
alkyne
alkene
amorphous carbon
coal

Explanation:

1. from decomposition of coal → Coke

Coke is obtained by burning of coal at high temperature.

2. triple bond   →Alkynes

Alkynes are hydrocarbons with triple covalent bond between the carbon atoms.

3.hard, three dimensional   → diamond

Diamond is an alotropic form of carbon which have 3-D structure which accounts for its hardness.

4.major source of today's medicine  → coal

Many medicine or chemicals used in medicinal industries are obtained by distillation of coal such as : salicyclic acid derived tar, phenols etc.

5.double bond → alkene

Alkenes are hydrocarbons with double covalent bond between the carbon atoms.

6.soft, two dimensional   → graphite

Graphite is an alotropic form of carbon which have 2-D or layered structure which accounts for its softness.

7.saturated hydrocarbon series  → alkanes

Hydrocarbons with single bond and no double or triple bond is present in between carbon atoms.

8.major reaction type for alkanes  → combustion

When alkanes react with oxygen or burn in the atmosphere of oxygen they give water and carbon-dioxide

9.soot, carbon black → amorphous carbon

Amorphous carbon is an form of carbon without any structure or shape

radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.