Question

Explain any two methods preparations of alkanes

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Answer 1

Answer:

react with H2 in the presence of finely divided catalysts such as platinum, palladium or nickel to form alkanes. This process is called hydrogenation.

Preparation of alkanes by hydrogentation

hydrogenation

Preparation of Alkanes from Alkyl Halides

The following methods are used to prepare alkanes from alkyl halides (R−X) :

Alkyl halides (except alkyl fluorides) on reduction with zinc and dilute hydrochloric acid produce alkanes.

Preparation of alkanes by reduction of alkyl halides

reduction of haloalkanes

Answer 2

Two methods to prepare alkanes:-

1. Dehydrohalogenation of vic-Dihalides or gem-Dihalides.

2. Dehalogenation of vic-Tetrahalogen Compounds.

This reaction has the drawback that the halogen compound is itself prepared by halogen addition to alkynes.

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