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Thermal Decomposition of Alkanes

Thermal decom...

Question

Thermal decomposition of higher hydrocarbons into lower hydrocarbons is called:

A

aromatization

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B

cracking

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C

reforming

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D

isomerization

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Solution

The correct option is D cracking
Thermal decomposition of higher hydrocarbons into lower hydrocarbons is called cracking or pyrolysis or fragmentation.
Eg: $C_{2} H_{6}^{\circ} C_{2} H_{4} + H_{2}$

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Q. Fill in the blanks with appropriate words selected from those given below.

heights, condense, lower, bitumen, hydrocarbons,
high, fractional distillation, cool, fractionating column,
diesel oil, petrol, refinery, higher up, lower down

(a) Crude oil is made up of many different ___________. In an oil ___________, the hydrocarbons are separated into different products by a process called _____________ ___________. The crude oil is heated to a high temperature and passed into the____________ __________. As the vapours rise towards the top the different hydrocarbons ___________ at different ___________ and are withdrawn separately.
(b) Substances with _____________ boiling points condense first, in the column. Substances with ___________ boiling points condense ______________. Light products like ___________ are withdrawn from near the top of the column. Heavier products like ___________ and fuel oil are taken out lower down. The heaviest hydrocarbons, such as __________ are left at the bottom.

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