Question

149
Hydrocarbons
28. Which among the following alkanes can be prepared by metal carbides ?
(Hexane
(b) Cyclohexane (c) Methane
(d) Isobutane

Answer 1

Answer:

(c) Methane

Explanation:

Methane can be prepared by metal carbides

Answer 2

Alkanes can be prepared by metal carbides with methane.

Explanation:

• Metal carbides like aluminum carbides  $Al4C3$ and beryllium carbide will react with pure water to form methane.

$Al4C3 + 12H2O ------- 4Al(OH)3 + 3CH4$

• Alkanes can be prepared with metal carbides as a byproduct.
• Metal carbides can be prepared by direct heating of metal, metal hydride, metal oxide and carbon.
• It can be prepared either by heating metal or metal chloride with carburizing gas.