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Question

Dodecane in presence of platinum gives a mixture of:


A

Pentene and Heptene

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B

2 molecules of pentane

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C

Pentane and Heptane

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D

Heptane and pentene

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Solution

The correct option is D i.e Heptane and pentene
Pyrolysis is defined as the conversion of a compound into smaller fragments in the absence of air through the application of heat.
In the absence of air when Alkane vapours are passed through red-hot metal it breaks down into simpler hydrocarbons. This process takes place at high temperatures and high pressure without a catalyst. At low temperatures and pressure, the presence of a catalyst such as platinum or palladium is required for this reaction.

Dodecane in presence of platinum gives a mixture of Heptane and Pentene.

Reaction: C12H26PtC7H16+C5H10
Dodecane Heptane Pentene.


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