Properties and Uses of Alkenes

The video tutorial explores the properties, reactions, and applications of alkenes. It covers their physical states, solubility, and density, as well as their boiling and melting points. The reactivity of alkenes is discussed, focusing on addition reactions and the role of isomers. The video explains Markovnikov's and anti-Markovnikov's rules, hydration, and reactions with sulfuric acid. It also covers combustion, oxidation, polymerization, and isomerization processes. Finally, the video highlights the industrial applications of alkenes, including their use in manufacturing solvents, plastics, and artificial ripening agents.

Which of the following statements about the physical state of alkenes is correct?

• Alkenes with 5 to 15 carbon atoms are colorless gases.

• Lower alkenes are colorless liquids.

• All alkenes are soluble in water.

• Higher alkenes are colorless solids.

What is the main reason for the higher boiling point of cis isomers compared to trans isomers?

• Cis isomers have stronger sigma bonds.

• Cis isomers are more polar.

• Trans isomers are more polar.

• Trans isomers have weaker pi bonds.

In the addition of hydrogen halides to alkenes, what does Markovnikov's rule state?

• The halide ion attaches to the carbon with fewer hydrogen atoms.

• The hydrogen ion attaches to the carbon with fewer hydrogen atoms.

• The hydrogen ion attaches to the carbon with more hydrogen atoms.

• The halide ion attaches to the carbon with more hydrogen atoms.

What is the peroxide effect in the addition of hydrogen bromide to alkenes?

• It leads to the formation of 2-bromopropane.

• It follows Markovnikov's rule.

• It involves a free radical mechanism.

• It requires a high temperature.

What is the product formed when water is added to ethene in an acid-catalyzed reaction?

• Ethanol

• Ethylene glycol

• Ethylene chlorohydrin

• Ethyl hydrogen sulfate

What is the result of the complete combustion of alkenes?

• Carbon dioxide and hydrogen

• Carbon dioxide and water

• Carbon monoxide and water

• Carbon monoxide and hydrogen

What is the purpose of the Bayer's test in the context of alkenes?

• To test for the presence of carboxylic acids

• To test for the presence of unsaturation

• To test for the presence of alcohols

• To test for the presence of ketones

What is the main product when propane is oxidized with potassium permanganate?

• Ethanoic acid

• Propanoic acid

• Prop-1,2-diol

• Methanoic acid

What is the catalyst used in the polymerization of ethene to form polyethene?

• Silver

• Potassium permanganate

• Organic peroxides

• Aluminum sulfate

Which of the following is a use of ethene in industry?

• Synthesis of proteins

• Manufacturing of metals

• Artificial ripening of fruits

• Production of glass