Question

# Which of the following names represents the foul smelling, black, thick, viscous liquid obtained from the destructive distillation of coal?A.CokeB.Coal tarC.Coal gasD.None of these

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Hint: Destructive distillation is a process which involves the decomposition of unprocessed material under specific conditions of high temperature and a certain amount of pressure.

-The type of products that we may obtain largely depends on the temperature at which we process the coal. When the temperature is between 400 $^\circ C$ and 500 $^\circ C$, cola breaks down to form only some gases, certain oils and paraffins. When the temperature is further risen from 700 $^\circ C$ to 800 $^\circ C$, the resulting products consist of more gases, which majorly contain hydrogen. On further heating, we can observe the formation of gases such as hydrogen, methane, ethane and ethylene; whilst contact of these gases with the hot retort causes further splitting off of hydrogen and condensation of the nuclei into benzene, toluene, naphthalene, and anthracene, which are contained in the tar.