Quantitative Analysis

What is the number of sigma bonds in a benzene molecule?

• 3

• 6

• 9

• 12

The compound shown below can be prepared from phenol.

Which reagent(s) is/are required?

• Concentrated NH₃

• Dilute NH₃

• Dilute HNO₃ and then concentrated HCl /Sn

• Dilute HNO₃ and then NaBH₄

Which reagent could be used to distinguish between CH₃CH₂OH and C₆H₅OH?

• AgNO₃(aq) in ethanol

• CH₃COCl

• Na₂CO₃(aq)

• Bromine Water

Benzene reacts with an organic reagent in the presence of a halogen carrier to form phenylethanone.

Which organic reagent is required?

• CH₃CH₂OH

• CH₃CHO

• CH₃COCl

• CH₃COOH

Which statement(s) support(s) the delocalised model for the structure of benzene?

1- All carbon–carbon bonds have the same length.

2- The enthalpy change of hydrogenation of benzene is less exothermic than expected.

3- Bromine reacts with benzene less readily than with cyclohexene.

• 1, 2 and 3

• Only 1 and 2

• Only 2 and 3

• Only 1

Which of the following could react with the compound below to form a carbon–carbon bond?

1- CH₃Cl and AlCl₃

2- KCN in ethanol

3- CH₃OH and H₂SO₄

• 1, 2 and 3

• Only 1 and 2

• Only 2 and 3

• Only 1

Phenol reacts with bromine.

Which is the LEAST likely organic product?

• 
• 
• 
• 

Which chemical(s) can react with phenol?

1- Potassium hydroxide

2- Ethanoyl chloride

3- Nitric acid

• 1, 2 and 3

• Only 1 and 2

• Only 2 and 3

• Only 1