1. Which of the following compounds give a positive bromine test (disappearance

ID: 792145 • Letter: 1

Question

1. Which of the following compounds give a positive bromine test (disappearance of red)? a. pentane b. 1-petene c. hexane d. 2-hexene

2. A student prepares cyclohexene from cyclohexanol, but forgets to do the extractions. As a result the product contains some cyclohexanol. What peaks would you expect to see in the IR spectrum of this impure product?
3. A centrifuge tube contains 4-methylcyclohene and an aqueous sodium chloride solution. Why are two distinct layers formed? Which layer contains 4-methylcyclohexene, why?
4. In this experiment, phosphoric acid was used as a catalyst. What is the purpose of a catalyst? 2. A student prepares cyclohexene from cyclohexanol, but forgets to do the extractions. As a result the product contains some cyclohexanol. What peaks would you expect to see in the IR spectrum of this impure product?
3. A centrifuge tube contains 4-methylcyclohene and an aqueous sodium chloride solution. Why are two distinct layers formed? Which layer contains 4-methylcyclohexene, why?
4. In this experiment, phosphoric acid was used as a catalyst. What is the purpose of a catalyst?

Explanation / Answer

1) b, d

2) in IR spectram 3400 -3500 broad peak for OH group in cyclohexanol, and 3000-3100 for C-H streatching incyclohexane

3) upper layer should contains 4-methyl cyclohexane, because its density is lower compare to aqueous sodium chloride solution

4) phosphoric acid is acid catalyst, it used for dehydration of alcholos to alkenes

Navigate

1. Which of the following compounds does not have an alpha hydrogen? B) 11 A) I

1. Which of the following compounds has physical and chemical properties similar

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.

1. Which of the following compounds give a positive bromine test (disappearance

Question