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Question

C2H6900∘C−−−→C2H4+H2
Above reaction is called as ____.

A
combustion
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B
rearrangement
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C
pyrolysis
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D
cleavage
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Solution

The correct option is B pyrolysis
Pyrolysis is defined as the conversion of a compound into smaller fragments in the absence of air through the application of heat. It is different from combustion. It happens in the absence of air and hence oxidation of compounds does not take place. Generally, pyrolysis of alkanes is also named as cracking.

Pyrolysis of ethane is used extensively for the production of ethylene (C2H4). This pyrolysis is performed for industrial purposes in the presence of steam around 900°C (steam cracking). The steam is used as a diluent for ethane pyrolysis.


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