Question 1

$\pi$bonds are quite susceptible to reaction with electron-seeking reagents,also referred to as ____________________.

Accepted Answer

The answer of  $\pi$bonds are quite susceptible to reaction...

Question 2

For an addition reaction,why does the free energy term, Δ\DeltaΔ G,become more positive with increasing temperature?

Accepted Answer

A)  The positive entropy term dominates at high temperature.
B)  The negative entropy term dominates at high temperature.
C)  The positive enthalpy term dominates at high temperature.
D)  The negative enthalpy term dominates at high temperature.
E)  The enthalpy and entropy terms cancel at high temperature.

Question 3

What is the IUPAC name of the expected major product formed upon reaction of HCl with 3-methyl-1-butene?

Accepted Answer

A)  1-Chloro-2-methylbutane
B)  1-Chloro-3-methylbutane
C)  2-Chloro-2-methylbutane
D)  2-Chloro-3-methylbutane
E)  1-Chloropentane

Question 4

The regioselectivity and stereospecificity in the acid-catalyzed hydration of an alkene is best described as:

Accepted Answer

A)  Markovnikov orientation with syn-addition
B)  Markovnikov orientation with anti-addition
C)  anti-Markovnikov orientation with syn-addition
D)  anti-Markovnikov orientation with anti-addition
E)  Markonikov orientation with both syn- and anti-addition

Question 5

Addition reactions of alkenes are characterized by:

Accepted Answer

A)  formation of a π bond
B)  addition of two groups across a double bond
C)  breaking of a π bond
D)  A and B
E)  B and C

Question 6

When an alkene is subjected to treatment with Hg(OAc) 2 in alcohol,followed by reaction with NaBH4,what functional group is formed?

Accepted Answer

A)  ether
B)  epoxide
C)  alkane
D)  syn diol
E)  alkyne

Question 7

Which of the following will yield 2-methylpentane upon catalytic hydrogenation?

Accepted Answer

A)  2-methyl-1-pentene2
B)  2-methyl-2-pentene
C)  4-methyl-2-pentene
D)  4-methyl-1-pentene
E)  All of the above

Question 8

Which of the following alkene addition reactions occur(s) specifically in syn fashion?

Accepted Answer

A)  dihydroxylation using OsO4,H2O2
B)  addition of H2
C)  hydroboration
D)  addition of HCl
E)  A,B,and C

Question 9

Which of the catalysts listed are used in the homogenous catalytic hydrogenation of alkenes? I) Ni II) Pt III) Wilkinson

Accepted Answer

A)  I
B)  II
C)  III
D)  I and II
E)  II and III

Question 10

The expected product(s) resulting from addition of Br2 to (E) -3-hexene would be:

Accepted Answer

A)  a meso dibromide.
B)  a mixture of optically active enantiomeric dibromides.
C)  a mixture of optically inactive enantiomeric dibromides.
D)  (Z) -3,4-dibromo-3-hexene.
E)  (
E)  -3,4-dibromo-3-hexene.

Question 11

In a reaction where addition and elimination reactions are in competition,which of the following statements is most correct?

Accepted Answer

A)  Addition and elimination reactions are favored at low temperatures.
B)  Addition and elimination reactions are favored at high temperatures.
C)  Only addition reactions are favored at low temperatures.
D)  Only elimination reactions are favored at low temperatures.
E)  Addition and elimination reactions are disfavored at low temperatures.

Question 12

A reaction that could potentially yield two or more constitutional isomers,but as in hydroboration-oxidation produces only one isomer,is said to be _____________________.

Accepted Answer

The answer of A reaction that could potentially yield two...

Question 13

The Markovnikov product,resulting from an addition reaction to an unsymmetrical alkene,is formed because:

Accepted Answer

A)  the product is statistically favored.
B)  steric hindrance favors its formation.
C)  the reaction proceeds via the more/most stable carbocation.
D)  the reaction forms the more/most stable product.
E)  All of the above are valid reasons

Question 14

What product is formed when trans-1,2-dimethylcyclohexane is reacted with Pd/C and H2?

Accepted Answer

A)  No reaction
B)  cis-1,2-dimethylcyclohexane
C)  trans-3,4-dimethylhexane
D)  trans-1,2-dimethylhexane
E)  None of the above

Question 15

The expected Markovnikov addition product of HI to 2-methyl-2-butene is:

Accepted Answer

A)  2-iodopentane
B)  2-iodo-2-methylbutane
C)  1-iodo-2-methylbutane
D)  2-iodo-1-methylbutane
E)  3-iodo-2-methylbutane

Question 16

For the complete reduction of 1 mole of (3E,5E) -hepta-1,3,5-triene with H2 using a Pd catalyst,how many moles of H2 are consumed?

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  5

Question 17

The regioselectivity and stereospecificity in hydrohalogenation of an alkene is best described as:

Accepted Answer

A)  Markovnikov orientation with syn-addition
B)  Markovnikov orientation with anti-addition
C)  anti-Markovnikov orientation with syn-addition
D)  anti-Markovnikov orientation with anti-addition
E)  Markonikov orientation with both syn- and anti-addition

Question 18

The decrease in entropy (the  Δ\DeltaΔ  S value is negative) observed for alkene addition reactions results from:

Accepted Answer

A)  the breaking of a π and  σ\sigmaσ  bond.
B)  the formation of two  σ\sigmaσ  bonds.
C)  the reaction being exothermic.
D)  two molecules reacting to form a single molecule.
E)  the temperature dependence of the  Δ\DeltaΔ S term.

Question 19

Addition reactions are favorable at low temperatures because:

Accepted Answer

A)  the positive enthalpy term is larger than the negative entropy term.
B)  the negative enthalpy term is larger than the positive entropy term.
C)  the positive enthalpy term is smaller than the negative entropy term.
D)  the negative enthalpy term is smaller than the positive entropy term.
E)  the enthalpy and entropy terms are equal.

Question 20

How many moles of hydrogen (H2) are consumed in the catalytic reduction of 1 mole of 1,3-dibromocyclohexa-1,4-diene?

Accepted Answer

A)  12
B)  2
C)  3
D)  4
E)  None of the above

Exam 9: Addition Reactions of Alkenes

The expected product(s) resulting from addition of Br2 to (E) -3-hexene would be:

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The Markovnikov product,resulting from an addition reaction to an unsymmetrical alkene,is formed because:

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A reaction that could potentially yield two or more constitutional isomers,but as in hydroboration-oxidation produces only one isomer,is said to be _____________________.

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The expected Markovnikov addition product of HI to 2-methyl-2-butene is:

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In a reaction where addition and elimination reactions are in competition,which of the following statements is most correct?

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For an addition reaction,why does the free energy term, Δ\DeltaΔ G,become more positive with increasing temperature?

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What is the IUPAC name of the expected major product formed upon reaction of HCl with 3-methyl-1-butene?

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Which of the following alkene addition reactions occur(s) specifically in syn fashion?

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The regioselectivity and stereospecificity in hydrohalogenation of an alkene is best described as:

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Addition reactions of alkenes are characterized by:

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For the complete reduction of 1 mole of (3E,5E) -hepta-1,3,5-triene with H2 using a Pd catalyst,how many moles of H2 are consumed?

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Which of the following will yield 2-methylpentane upon catalytic hydrogenation?

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π\piπ bonds are quite susceptible to reaction with electron-seeking reagents,also referred to as ____________________.

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How many moles of hydrogen (H2) are consumed in the catalytic reduction of 1 mole of 1,3-dibromocyclohexa-1,4-diene?

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The regioselectivity and stereospecificity in the acid-catalyzed hydration of an alkene is best described as:

Correct AnswerverifiedShow Answer

What product is formed when trans-1,2-dimethylcyclohexane is reacted with Pd/C and H2?

Correct AnswerverifiedShow Answer

When an alkene is subjected to treatment with Hg(OAc) 2 in alcohol,followed by reaction with NaBH4,what functional group is formed?

Correct AnswerverifiedShow Answer

Addition reactions are favorable at low temperatures because:

Correct AnswerverifiedShow Answer

Which of the catalysts listed are used in the homogenous catalytic hydrogenation of alkenes? I) Ni II) Pt III) Wilkinson

Correct AnswerverifiedShow Answer

The decrease in entropy (the Δ\DeltaΔ S value is negative) observed for alkene addition reactions results from:

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The expected product(s) resulting from addition of Br₂ to (E) -3-hexene would be:

Correct Answer
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For an addition reaction,why does the free energy term, $\Delta$ G,become more positive with increasing temperature?

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For the complete reduction of 1 mole of (3E,5E) -hepta-1,3,5-triene with H₂ using a Pd catalyst,how many moles of H₂ are consumed?

Correct Answer
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$\pi$ bonds are quite susceptible to reaction with electron-seeking reagents,also referred to as ____________________.

Correct Answer
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How many moles of hydrogen (H₂) are consumed in the catalytic reduction of 1 mole of 1,3-dibromocyclohexa-1,4-diene?

Correct Answer
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What product is formed when trans-1,2-dimethylcyclohexane is reacted with Pd/C and H₂?

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When an alkene is subjected to treatment with Hg(OAc) ₂ in alcohol,followed by reaction with NaBH₄,what functional group is formed?

Correct Answer
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The decrease in entropy (the $\Delta$ S value is negative) observed for alkene addition reactions results from:

Correct Answer
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