Organic Chemistry : Organic Chemistry

Study concepts, example questions & explanations for Organic Chemistry

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Example Questions

Example Question #341 : Organic Chemistry

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Consider the pictured molecule. Creating a carbocation at which position will give us the most stable carbocation intermediate?

Possible Answers:

Correct answer:

Explanation:

Carbocations are most stable when they are most substituted. The carbon at position 2 is the most substituted carbon on the pictured molecule and would produce a tertiary carbocation. This is due to the fact that R-groups are electron-donating groups, and a carbocation is electron-deficient, thus the more R-groups adjacent to the carbocation, the more stable it will be.

Example Question #45 : Intermolecular Forces And Stability

Of the following, which is the strongest acid?

Possible Answers:

Correct answer:

Explanation:

We can eliminate  and  right away because they are not a strong acids, while the other answer choices are (memorizing strong acids and bases is recommended in most organic chemistry courses).

From here, we can methodically find the correct answer by comparing each answer choice's conjugate base. It is easier to compare base strength than acid strength and the stronger an acid's conjugate base, the weaker the acid (vice versa).

 is the largest conjugate base of the two choices. In this case, the large size of the bromine ion allows the negative charge to be dispersed more through the atom, providing stability. This stability makes it the weakest conjugate base and the strongest acid.

Example Question #271 : Organic Concepts

What is the order of increasing stability for the following ions going from least to greatest?

1. 

2.  

3. 

4. 

Possible Answers:

Correct answer:

Explanation:

The bigger the ion, the more stable it is, because the negative charge is distributed over a larger area.

Example Question #342 : Organic Chemistry

Which of the following statements best explains why the element carbon can make up the structure of a plethora of compounds?

Possible Answers:

Carbon readily forms ionic bonds with other carbon atoms

Carbon atoms have very high electronegativity, a characteristic which allows them to bond with other atoms

Carbon can form up to four covalent bonds, often with other carbon atoms

Carbon atoms combine very readily with oxygen atoms

Correct answer:

Carbon can form up to four covalent bonds, often with other carbon atoms

Explanation:

Carbon is a tetravalent element, meaning it can form up 4 covalent bonds with other elements, especially other carbon atoms. This allows for the formation of many different carbon-containing elements of differing sizes, shapes, and structures.

Example Question #342 : Organic Chemistry

Which of the following compounds is a saturated hydrocarbon?

Possible Answers:

Propyne

Propene

Propane

Benzene

Correct answer:

Propane

Explanation:

By definition, a saturated hydrocarbon is a compound that contains no double or triple bonds-all single bonds. Of these choices, propane (-ane suffix indicates that it is an alkane, which contains only single bonds) is the only saturated hydrocarbon.

Example Question #343 : Organic Chemistry

Hexane is an example of an __________ solvent.

Possible Answers:

polar protic

polar aprotic

nonpolar protic

nonpolar aprotic

Correct answer:

nonpolar aprotic

Explanation:

Hexane is a hydrocarbon consisting of 6 carbon atoms and 12 hydrogen atoms, making it nonpolar. Because it has no donatable hydrogen ions, it is also considered aprotic.

Example Question #274 : Organic Concepts

What substituent in the X-position would result in the product?

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Possible Answers:

Correct answer:

Explanation:

The inductive effect of the  group stabilized the carbocation further away from the electron withdrawing group, causing the addition of the  to occur there.

Example Question #343 : Organic Chemistry

How many sigma bonds does a double bond contain?

Possible Answers:

None

Correct answer:

Explanation:

A double bond contains one sigma bond and one pi bond.

Example Question #52 : Intermolecular Forces And Stability

How many sigma and pi bonds does a triple bond contain?

Possible Answers:

 and 

 and 

 and 

 and 

 and 

Correct answer:

 and 

Explanation:

A triple bond contains 2 pi bonds and a single sigma bond. 

Example Question #344 : Organic Chemistry

Which of the following functional groups would stabilize a Grignard reagent? 

Possible Answers:

Correct answer:

Explanation:

A Grignard reagent is equivalent to a carbanion. Electron withdrawing groups help stabilize the negative charge on the carbon while electron donating groups will destabilize it. Therefore,  is the only correct answer. 

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