Addition Reactions of Alkenes

This video tutorial explores the reactions of alkenes, which are unsaturated hydrocarbons with at least one carbon-carbon double bond. The video covers three types of addition reactions: with hydrogen, water, and halogens. It explains how alkenes react with hydrogen to form alkanes, with water to produce ethanol, and with halogens like bromine to form dibromoethane. The video also highlights the bromine test to distinguish alkenes from alkanes. The tutorial concludes with a summary and encourages viewers to share the content.

What is the functional group of alkenes?

• Carbon-hydrogen bond

• Carbon-carbon single bond

• Carbon-carbon double bond

• Carbon-oxygen double bond

What type of reaction allows alkenes to add another molecule?

• Substitution reaction

• Condensation reaction

• Elimination reaction

• Addition reaction

What is the product when propene reacts with hydrogen?

• Methane

• Propane

• Propine

• Ethane

What catalyst is required for the addition reaction of alkenes with hydrogen?

• No catalyst

• A base catalyst

• A metal catalyst

• An acid catalyst

What is the product when ethene reacts with water?

• Ethanol

• Butanol

• Methanol

• Propanol

What form must water be in for the addition reaction with ethene?

• Water solution

• Water vapor or steam

• Ice

• Liquid water

What method is used to separate ethanol from water after the reaction?

• Fractional distillation

• Decantation

• Simple distillation

• Filtration

Why does ethanol boil before water during fractional distillation?

• Ethanol has a higher boiling point

• Ethanol has a lower boiling point

• Ethanol is more volatile

• Ethanol is less dense

What is the product when ethene reacts with bromine?

• Dibromoethane

• Ethene

• Bromoethane

• Ethane

How can you distinguish alkenes from alkanes using bromine water?

• Alkenes decolorize bromine water

• Alkenes turn bromine water blue

• Alkanes decolorize bromine water

• Alkanes turn bromine water green