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There are 27 questions tagged under Organic Chemistry Reactions.

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1 Go

Q:

Increased steric hindrance enhances the rate of SN1 reactions versus SN2 reactions because

A

it is more difficult for the nucleophile to attack a sterically-hindered molecule.

B

steric hindrance increases reactivity which makes SN1 reactions more likely.

C

steric hindrance protects the nucleophile from reacting with the solvent.

D

nucleophilic attack of sterically-hindered molecules is easier than non-sterically-hindered molecules.

Tags: Organic Chemistry Reactions | Molecular Structure |

2 Go

Q:



Which of the following reagents would produce the product in the reaction above?

A

1-iodopropane

B

2-iodopropane

C

isobutyl iodide

D

1,2-diiodopropane

Tags: Organic Chemistry Reactions | Miscellaneous Organic Chemistry |

3 Go

Q:

Hydroformylation involves the addition of a formaldehyde (formyl groupe) onto alkenes. For a hydroformylation process with propene that follows Markovnikov addition using a carbocation intermediate, which product will be favored?

A

butanal

B

2-methylpropanal

C

2-methylbutanal

D

propanal

Tags: Organic Chemistry Reactions | Molecular Structure |

4 Go

Q:

The reaction below depicts a 1,2-hydride shift which is a reaction that heavily favors the products.


The reason for strongly favoring the products is:

A

the primary cabocation is more charged than the secondary carbocation and pulls the hydrogen atom toward itself

B

the hydride shift favors a secondary carbocation rather than a primary carbocation

C

methyl groups are more electronegative and pull positive charges toward themselves

D

the secondary carbocation is less stericaly hindered than the primary carbocation

Tags: Organic Chemistry Reactions | Molecular Structure |

5 Go

Q:

Upon oxidation with excess reagents, which of the following choices best describes the resultant molecule in terms of carboxylic acid and ketone sites present?


A

One carboxylic acid, two ketones

B

Three ketones

C

Two carboxylic acids

D

One carboxylic acid, one ketone

Tags: Carboxylic Acids | Organic Chemistry Reactions |

6 Go

Q:

The addition of Br2 to ethyne produces which of the following?

A

(E)-1,2-dibromoethene

B

(Z)-1,2-dibromoethene

C

(E)-1,2-dibromoethane

D

(Z)-1,2-dibromoethane

Tags: Miscellaneous Organic Chemistry | Organic Chemistry Reactions |

7 Go

Q:

In each molecule below, a carbocation is formed when the alcohol group is removed. Which of the following best describes the stabilities of the carbocations?


A

The carbocation of Alcohol A is more stable than the carbocation of Alcohol B since it lacks a methoxy group, which would destabilize the carbocation

B

The carbocation of Alcohol A is less stable than the carbocation of Alcohol B since it lacks a methoxy group, which would destabilize the carbocation

C

The carbocation of Alcohol B is more stable than the carbocation of Alcohol A since it has a methoxy group, which would stabilize the carbocation

D

The carbocation of Alcohol B is less stable than the carbocation of Alcohol A since it has a methoxy group, which would stabilize the carbocation

Tags: Molecular Structure | Organic Chemistry Reactions |

8 Go

Q:

Which of the following best describes the reaction presented below?


A

Resonance stabilization

B

Racemization

C

Epimerization

D

Tautomerization

Tags: Aldehydes and Ketones | Alcohols | Organic Chemistry Reactions |

9 Go

Q:

In the following reaction, the fastest reaction rate occurs in pure water, as opposed to occurring in a solvent like ethanol. Which of the following best describes why this scenario takes place?


A

The aromatic rings in both reactants are hydrophobic and will be in close proximity to each other, which increases the chance of a reaction taking place

B

The aromatic rings in both reactants are hydrophobic and will be in close proximity to each other, which decreases the chance of a reaction taking place

C

The aromatic rings in both reactants are hydrophilic and will be in close proximity to each other, which increases the chance of a reaction taking place

D

The aromatic rings in both reactants are hydrophilic and will be in close proximity to each other, which decreases the chance of a reaction taking place

Tags: Carboxylic Acids | Molecular Structure | Organic Chemistry Reactions |

10 Go

Q:

An allylic substitution reaction results in two regioisomeric monobromides, as shown below. Which of the following statements about their relative stabilities is correct?


A

Molecule A is more stable because it has a more sterically hindered bromine.

B

Molecule A is more stable because it has conjugated double bonds.

C

Molecule B is more stable because it has a less sterically hindered bromine.

D

Molecule B is more stable because it has conjugated double bonds.

Tags: Molecular Bonding | Molecular Structure | Organic Chemistry Reactions |

11 Go

Q:

The nitrogen-containing reactant below (Reactant B) can act as a nucleophile in certain reactions. The reaction below is carried out in a pH = 4.5 buffer. This is because the pKa of the protonated carbonyl (Reactant A) is between -2 and -8, so there is a low concentration of this highly reactive electrophile at a pH of 4.5. If the pH is further lowered (from 4.5) in order to try and increase the concentration of this electrophile, which of the following correctly describes the likely counter-effect?


A

Increasing the acidity would cause less of Reactant B to become protonated (decreasing its nucleophilicity), and this would counteract the increase in electrophilicity of Reactant A.

B

Increasing the acidity would cause more of Reactant B to become protonated (decreasing its nucleophilicity), and this would counteract the increase in electrophilicity of Reactant A.

C

Increasing the acidity would cause more of Reactant B to become protonated and this would have no effect on the electrophilicity of Reactant A.

D

Increasing the acidity would have no effect on Reactant B and no effect on the electrophilicity of Reactant A.

Tags: Acid/Base Equilibria | Miscellaneous Organic Chemistry | Organic Chemistry Reactions | Molecular Structure |

12 Go

Q:

Given the molecule below, which of the following is TRUE regarding its ability (or inability) to undergo an acylation reaction?


A

The molecule will undergo an intramolecular acylation reaction between the wedged alcohol and the carboxylic acid

B

The molecule will undergo an intramolecular acylation reaction between the dashed alcohol and the carboxylic acid

C

The molecule will NOT undergo an intramolecular acylation reaction because the double bond does not allow for the interaction between the alcohols and the carboxylic acid

D

The molecule will NOT undergo an intramolecular acylation reaction because acylation reactions cannot occur with carboxylic acids.

Tags: Carboxylic Acids | Organic Chemistry Reactions | Molecular Structure | Alcohols |

13 Go

Q:

SN1 reactions are not stereospecific because:

A

they involve a carbocation intermediate which can react to form one of two stereoisomers.

B

they are attacked by strong nucelophiles.

C

they have weak leaving groups.

D

they require an ionic environment for stabilization.

Tags: Organic Chemistry Reactions |

14 Go

Q:

Which of the following reagents would produce the reaction shown?

A

H2SO4

B

SOCl2

C

NaBH4

D

CrO3

Tags: Organic Chemistry Reactions |

15 Go

Q:

Otherwise lipid-soluble steroid molecules can be made water-soluble by which of the following modifications?

A

reducing alcohol groups

B

adding carboxylic acid groups

C

oxidizing hydrogen atoms to alcohol groups

D

decarboxylation

Tags: Organic Chemistry Reactions |

16 Go

Q:

How does the oxidation state of carbon change when an alcohol is oxidized to an aldehyde?

A

The oxidation state increases by 2.

B

The oxidation state decreases by 2.

C

The oxidation state increases by 1.

D

The oxidation state decreases by 1.

Tags: Redox Reactions | Organic Chemistry Reactions |

17 Go

Q:

A nucleophilic reaction to a carbonyl is considered neither an SN1 nor SN2 reaction because:

A

no substitution occurs during nucleophilic addition to a carbonyl.

B

the reaction proceeds through an E1 or E2 mechanism instead.

C

the solvent for the reaction is not aqueous.

D

the solvent for the reaction is not polar.

Tags: Miscellaneous Organic Chemistry | Organic Chemistry Reactions |

18 Go

Q:

A nucleophilic functional group may also be thought of as a:

A

Lewis acid.

B

Lewis base.

C

Bronsted acid.

D

Bronsted base.

Tags: Organic Chemistry Reactions |

19 Go

Q:

The Tollens' test will yield a shiny silver mirror on the glass vial containing the reaction if what type of sugar is added?

A

reducing sugar

B

non-reducing sugar

C

any disaccharide

D

any non-monosaccharide

Tags: Carbohydrates | Organic Chemistry Reactions |

20 Go

Q:

Which of the following is FALSE regarding SN1 reactions?

A

The second step is rate limiting.

B

There are two steps in the reaction.

C

The rate limiting step involves the departure of a leaving group.

D

An intermediary carbocation is formed.

Tags: Organic Chemistry Reactions |

21 Go

Q:

Which of the following is a possible product of the reduction of an aldehyde?

A

cyclohexanone

B

butanol

C

3-pentanol

D

butyraldehyde

Tags: Organic Chemistry Reactions |

22 Go

Q:

Ethanoyl chloride (CH3COCl) reacts with water to form a(n):

A

carboxylic acid.

B

ester.

C

alcohol.

D

amide.

Tags: Organic Chemistry Reactions |

23 Go

Q:

Which of the following is accurate regarding SN1 reactions?

A

They take place in a single step.

B

No nucleophilic attack is required.

C

Halides very rarely serve as leaving groups.

D

The reaction passes through a planar intermediate molecule.

Tags: Organic Chemistry Reactions |

24 Go

Q:

Various carbocations are produced in the laboratory with various groups attached to the carbon atom. Which of the following groups would yield least stable molecule?

A

two ethyl groups and one methyl group

B

all hydrogen atoms

C

one ethyl group and two methyl groups

D

three phenyl groups

Tags: Organic Chemistry Reactions |

25 Go

Q:

An amide bond between amino acids can be formed via a:

A

hydration reaction.

B

dehydration reaction.

C

decarboxylation reaction.

D

redox reaction.

Tags: Organic Chemistry Reactions |

26 Go

Q:

Strecker synthesis is used in the synthesis of:

A

fats.

B

hydrocarbons.

C

nucleic acids.

D

amino acids.

Tags: Organic Chemistry Reactions |

27 Go

Q:

In organic reactions, hydrides are mostly utilized as:

A

a stable R-group.

B

reducing agents.

C

largely inert.

D

a proton-acceptor.

Tags: Organic Chemistry Reactions |

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