Question

40. Predict from dimethyl ether or ethanol which has the higher boiling point. Explain. (4 marks 41. Which of the following compounds would be more soluble in water? Explain. (4 marks) b. H3 CH3 hivo loto ܐ ܀ H3C H3C -CH 42. What is the type of reaction that takes place when the below aldehyde reacts with Benedict's solution? Draw the product. ON (4 marks)

Answer 1

40.

Ethanol boiling point: 78 degree; dimethyl ether boiling point: -24 degree. ethanol has a higher boiling point due to hydrogen bonding interaction.

I hydrogen bonding interaction

41. propanal CH3-CH2-CHO will have greater solubility in water due to hydrogen bonding interaction as shown below

H H H hydrogen bonding interaction

35.

answer is 2,3-dimethylhexane

1 1 2 4 5 6 2,3-dimethylhexane The longest carbon chain has six carbon therfore basic name is hexane, the 2nd and 3rd position has methyl group therefore complete name is 2,3-dimethylhexane

36.

in below reaction water added across the double bond where hydroxy group is added to more substituted carbon

H ОН Н,0