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Homework answers / question archive / New York University BIOCHEMIST 406 1)Which of the following statements is true about the solubility of alkenes? all alkenes are soluble in water long chain alkenes are soluble in water, but short chain alkenes are insoluble long chain alkenes are insoluble in water, but short chain alkenes are soluble all alkenes are soluble in alkanes       What is the molecular formula of isoprene, the building block of all terpenes? C5H6 C5H8 C6H10 C5H12     How many double bonds are present in isoprene, the building block of terpenes? 0 1 2 3       Which of the following compounds have the carbon skeleton of a terpene? compounds (i) and (ii) compounds (i) and (iii) compounds (ii) and (iii) only compound (i)       How many isoprene units are present in the following natural terpene? 2 3 4 5     Vitamin A contains four isoprene units

New York University BIOCHEMIST 406 1)Which of the following statements is true about the solubility of alkenes? all alkenes are soluble in water long chain alkenes are soluble in water, but short chain alkenes are insoluble long chain alkenes are insoluble in water, but short chain alkenes are soluble all alkenes are soluble in alkanes       What is the molecular formula of isoprene, the building block of all terpenes? C5H6 C5H8 C6H10 C5H12     How many double bonds are present in isoprene, the building block of terpenes? 0 1 2 3       Which of the following compounds have the carbon skeleton of a terpene? compounds (i) and (ii) compounds (i) and (iii) compounds (ii) and (iii) only compound (i)       How many isoprene units are present in the following natural terpene? 2 3 4 5     Vitamin A contains four isoprene units

Chemistry

New York University

BIOCHEMIST 406

1)Which of the following statements is true about the solubility of alkenes?

    1. all alkenes are soluble in water
    2. long chain alkenes are soluble in water, but short chain alkenes are insoluble
    3. long chain alkenes are insoluble in water, but short chain alkenes are soluble
    4. all alkenes are soluble in alkanes

 

 

 

  1. What is the molecular formula of isoprene, the building block of all terpenes?
    1. C5H6
    2. C5H8
    3. C6H10
    4. C5H12

 

 

  1. How many double bonds are present in isoprene, the building block of terpenes?
    1. 0
    2. 1
    3. 2
    4. 3

 

 

 

  1. Which of the following compounds have the carbon skeleton of a terpene?

    1. compounds (i) and (ii)
    2. compounds (i) and (iii)
    3. compounds (ii) and (iii)
    4. only compound (i)

 

 

 

  1. How many isoprene units are present in the following natural terpene?

    1. 2
    2. 3
    3. 4
    4. 5

 

 

  1. Vitamin A contains four isoprene units. Which of the following represents the molecular formula of vitamin A?
    1. C4H8O
    2. C10H18O
    3. C20H30O
    4. C40H60O

 

 

  1. The structure of farnesol contains three isoprene units. Which of the following represents the molecular formula of farnesol?
    1. C10H16O
    2. C10H15O
    3. C15H26O
    4. C20H30O

 

 

  1. Which of the following is not an intermediate in the biosynthesis of cholesterol?
    1. farnesol
    2. geraniol
    3. retinol
    4. none, they are all intermediates in the synthesis of cholesterol

 

 

 

  1. Which of the following is the most characteristic reaction of alkenes?
    1. addition
    2. oxidation
    3. reduction
    4. substitution

 

 

 

  1. Which of the following reactions involves the addition of two equivalent groups to the two ends of a double bond?
    1. hydrogenation
    2. hydrobromination
    3. both (a) and (b)
    4. neither (a) nor (b)

 

 

 

  1. Which of the following reactions involves the addition of two equivalent groups to the two ends of a double bond?
    1. hydration
    2. hydrogenation
    3. both (a) and (b)
    4. neither (a) nor (b)

 

 

  1. Which of the following reactions involves the addition of two equivalent groups to the two ends of a double bond?
    1. bromination
    2. hydrogenation
    3. both (a) and (b)
    4. neither (a) nor (b)

 

 

 

  1. Which of the following reactions involves the addition of different groups to the two ends of a double bond?
    1. hydrogenation
    2. hydrobromination
    3. both (a) and (b)
    4. neither (a) nor (b)

 

 

 

  1. Which of the following reactions involves the addition of different groups to the two ends of a double bond?
    1. hydration
    2. hydrogenation
    3. both (a) and (b)
    4. neither (a) nor (b)

 

 

 

  1. Which of the following reactions involves the addition of different groups to the two ends of a double bond?
    1. bromination
    2. hydrogenation
    3. both (a) and (b)
    4. neither (a) nor (b)

 

 

 

  1. Which of the following curved arrows correctly describes the first step of the reaction of propene with a hydrogen halide?

 

 

A.

 

 

 

B.

 

 

C.

D. none of these are correct

 

 

  1. Which of the following curved arrows correctly describes the second step in the reaction of propene with hydrogen bromide?

 

 

A.

 

 

 

B.

 

 

C.

D.

 

 

 

  1. Markovnikov's rule is not useful for predicting the outcome of the reaction of hydrogen chloride with which of the following alkenes?
    1. 1-butene
    2. 2-butene
    3. 2-methylpropene
    4. 1-pentene

 

 

 

  1. Markovnikov's rule is useful to predict the outcome of the reaction of hydrogen chloride with which of the following alkenes?
    1. 1-butene
    2. 2-butene
    3. both (a) and (b)
    4. neither (a) nor (b)

 

 

 

  1. Markovnikov?s rule is useful in predicting the outcome for which of the following addition reactions of unsymmetrical alkenes?
    1. hydration
    2. bromination
    3. both (a) and (b)
    4. neither (a) nor (b)

 

 

  1. Which of the listed products will be formed in the following reaction?

 

A.

B.

C.

D.

 

 

 

 

  1. Which of the listed products will be formed in the following reaction?

 

A.

 

 

 

B.

 

 

C.

 

 

D.

 

 

 

 

  1. Which of the listed products will be formed in the following reaction?

 

A.

B.

 

 

 

 

C.

D.

 

 

 

  1. What product is obtained by the hydrobromination of 2-methyl-1-pentene?
    1. 1-bromo-2-methylpentane
    2. 2-bromo-2-methylpentane
    3. 2,3-dibromo-2-methylpentane
    4. 3,3-dibromo-2-methylpentane

 

 

 

  1. What product is obtained by the hydrobromination of 2-methyl-2-pentene?
    1. 3-bromo-2-methylpentane
    2. 2-bromo-2-methylpentane
    3. 2,3-dibromo-2-methylpentane
    4. 3,3-dibromo-2-methylpentane

 

 

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