Alkenes - intervention session 2

What type of bonds are formed when the p orbitals of two carbon atoms overlap with each other?

• π bonds

• σ bonds

• Ionic bonds

• Hydrogen bonds

Which of the following statements is true about the bonding in alkenes?

• Two π bonds are formed with other atoms.

• Three σ bonds are formed with other atoms.

• One π bond is formed with the other carbon atom of the double bond.

• Four σ bonds are formed with other atoms.

What is the bond angle in a planar arrangement of an alkene molecule?

• 90°

• 109.5°

• 120°

• 180°

What is the characteristic of cis isomers in alkenes?

• They have two groups on opposite sides of the double bond.

• They have two groups on the same side of the double bond.

• They have no groups attached to the double bond.

• They have groups that rotate freely around the double bond.

What is the difference between E/Z isomerism and cis/trans isomerism?

• E/Z isomerism occurs when the atoms or groups attached to each carbon atom of the C=C bond are the same.

• Cis/trans isomerism occurs when different atoms or groups of atoms are attached to each carbon atom of the C=C bond.

• E/Z isomerism occurs when different atoms or groups of atoms are attached to each carbon atom of the C=C bond.

• Cis/trans isomerism occurs when the atoms or groups attached to each carbon atom of the C=C bond are different.

Why can't 2-methylpropene have cis/trans isomers?

• Because it has a triple bond

• Because the methyl groups are on the same side of the C=C bond

• Because it has a single bond

• Because it has identical groups on both sides of the C=C bond

What rule is used to determine the priority of groups in E/Z isomers?

• Markovnikov's rule

• Hund's rule

• Cahn-Ingold-Prelog (CIP) priority rules

• Pauli exclusion principle

Why are alkenes more reactive than alkanes?

• Due to the presence of a C-H bond

• Due to the presence of a C-C single bond

• Due to the presence of a C=C bond

• Due to the presence of a C-O bond

What happens to bromine water when it reacts with an unsaturated compound?

• It turns orange

• It decolourises

• It turns red

• It remains the same

What conditions are required for the hydration of alkenes?

• Steam at 300°C, 60 atmospheres, and sulphuric acid or phosphoric acid catalyst

• Steam at 100°C, 1 atmosphere, and sulphuric acid catalyst

• Water at 25°C, 1 atmosphere, and phosphoric acid catalyst

• Steam at 200°C, 30 atmospheres, and hydrochloric acid catalyst