What is the numberof sigma bonds in a benzene molecule?

• 3

• 6

• 9

• 12

Answer explanation

Include C-H as well as C-C bonds.

What is the number of chiral centres in the molecule below?

• 4

• 5

• 6

• 7

Which compound cannot be hydrolysed?

• CH₃COOH

• CH3COCl

• CH₃CONHCH₃

• CH₃COOCH₃

The compound shown 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?

• AgNO_3(aq) in ethanol

• CH₃COCl

• Na₂CO_3(aq)

• Bromine water

How many peaks are observed in the ¹³C NMR spectrum of 1,3-dimethylbenzene?

• 3

• 4

• 5

• 6

Which compound is used as a standard for NMR chemical shift measurements?

• Si(CH₃)4

• CDCl₃

• D₂O

• CCl₄

Which compound is a secondary amide?

• 
• 
• 
• 

What is the number of peaks in the ¹H NMR spectrum of HOOCCH₂CHOHCH₂COOH?

• 3

• 4

• 5

• 6

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