18 Questions
What is the purpose of using Baeyer’s reagent in the oxidation of alkenes?
To produce vicinal glycols
What is the product obtained when propyne is reduced using Pt/Pd/Ni catalyst?
Propane
How is the presence of unsaturation detected using potassium permanganate solution?
By the decolorization of the KMnO4 solution
What is the effect of acidic potassium permanganate or acidic potassium dichromate on alkenes?
Oxidizes alkenes
How can alkanes be prepared from alkyl halides using zinc and dilute hydrochloric acid?
Alkyl halides (except fluorides) on reduction with zinc and dilute hydrochloric acid give alkanes.
What is the reaction called when alkyl halides react with sodium metal in dry ethereal solution?
Wurtz reaction
What happens when two different alkyl halides are taken in the Wurtz reaction?
A mixture of two different higher alkanes is obtained.
Which alkane is suggested for the preparation of toluene?
n-Alkanes with six or more carbon atoms
What are the simple compounds that are combined to form polymers, and what are these simple compounds called?
Monomers; ethene molecules
What is the product formed when bromomethane reacts with sodium in the Wurtz reaction?
Methane
Give an example of a polymer obtained by polymerizing a different alkene under high temperature and pressure.
Polypropene
Describe the process of polymerization for obtaining polythene.
Combination of ethene molecules at high temperature, high pressure, and with a catalyst
What product is obtained when 1-chloropropane undergoes electrolysis?
Propane
What reaction is used for the industrial preparation of dihydrogen gas?
Methane reacts with steam in the presence of a nickel catalyst.
What is the process called when higher alkanes decompose into lower alkanes and alkenes by the application of heat?
Pyrolysis or cracking
What is the principle involved in the preparation of oil gas from kerosene oil?
Pyrolysis
What is the product formed when dodecane is heated to 973K in the presence of platinum, palladium, or nickel?
Mixture of heptane and pentene
What type of reaction is believed to occur during the pyrolysis of alkanes?
Free radical reaction
Study Notes
- Alkyl halides (except fluorides) can be reduced with zinc and dilute hydrochloric acid to give alkanes.
- Alkyl halides can also react with sodium metal in dry ethereal solution to produce higher alkanes through the Wurtz reaction.
- The Wurtz reaction is used for preparing higher alkanes with an even number of carbon atoms.
- Alkenes react with cold, dilute aqueous potassium permanganate to produce vicinal glycols, used to test for unsaturation.
- Polymerization of ethene molecules at high temperature and pressure with a catalyst produces polythene, a polymer used in plastic bags and other products.
Test your knowledge on the reactions involving alkanes in organic chemistry. Questions may cover topics such as reduction of alkynes to alkanes and alkyl halides to alkanes using specific reagents.
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