Organic Chemistry : Identifying Other Organic Compounds

Study concepts, example questions & explanations for Organic Chemistry

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Example Questions

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Example Question #41 : Organic Functional Groups And Molecules

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How many conjugated atoms are present in the given molecule?

Possible Answers:

Correct answer:

Explanation:

A conjugated molecule is one that has its atoms arranged in such a way that allows p orbitals to lie parallel to each other. This allows for electron delocalization, which ultimately provides increased stability for the molecule. To find conjugated atoms, look for alternating single and multiple bonds. The circled carbon atoms are the only ones that are conjugated in this molecule.

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Example Question #42 : Organic Functional Groups

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How many hydrogens are present in the given molecule?

Possible Answers:

Correct answer:

Explanation:

Each alcohol group provides a hydrogen. Additionally, there are 24 "hidden" hydrogens. Refer to the photo below to see where these "hidden" hydrogens are located.

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Example Question #43 : Organic Functional Groups

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What type of orbital is the lone pair on the nitrogen found in?

Possible Answers:

p

sp3

sp2

sp

Correct answer:

sp2

Explanation:

In this molecule, the carbon that is directly attached to the nitrogen and the nitrogen itself are sp2 hybridized. This means that, within this bond, there are three sp2 orbitals present and the lone pair on the nitrogen occupies one of them.

Example Question #44 : Organic Functional Groups

What is the general formula of an ether?

Possible Answers:

Correct answer:

Explanation:

 is the general formula of an ether.

Example Question #45 : Organic Functional Groups

List all functional groups in the given molecule.

Possible Answers:

Ether, carboxylic acid, alkyl halide

Ether, alcohol, Acid anhydride, ketone

Ester, carboxylic acid, alkyl halide, methyl

Ester, alcohol, ketone

Correct answer:

Ether, carboxylic acid, alkyl halide

Explanation:

The first carbon that is attached to the chlorine is an alkyl halide. The oxygen that is directly attached to two carbons is an ether. Lastly, the  is a carboxylic acid.

Example Question #46 : Organic Functional Groups

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Which functional groups are present in the pictured molecule?

Possible Answers:

Phenyl, ketone, amide, ester

Phenyl, ketone, amine, acid anhydride

Phenyl, aldehyde, amine, acid anhydride

Phenyl, ketone, amine, ester

Correct answer:

Phenyl, ketone, amine, acid anhydride

Explanation:

This picture shows each functional group in its own box.

1. Phenyl

2. Ketone

3. Amine

4. Acid anhydride

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Example Question #51 : Organic Functional Groups

Which of the following compounds has the molecular formula, ?

Possible Answers:

Benzene

Hexyne

Hexane

Hexene

Correct answer:

Hexene

Explanation:

The molecular formula follows the rule regarding the molecular formula of alkenes: . Therefore,  is the molecular formula for hexene.

Example Question #52 : Organic Functional Groups

What kind of organic compounds contain an  group?

Possible Answers:

Alcohols

Aldehydes

All of these

Ketones

Correct answer:

Alcohols

Explanation:

By definition, alcohols are compounds that contain an  (hydroxyl) group bonded covalently to the end of a hydrocarbon.

Example Question #141 : Organic Concepts

Ethanol  is characterized as what kind of alcohol?

Possible Answers:

Tertiary alcohol

Primary alcohol

Organic acid

Secondary alcohol

Correct answer:

Primary alcohol

Explanation:

Ethanol (or ethyl alcohol) is characterized as a primary alcohol since there is only one carbon-containing group that is directly attached to the carbon containing the  group.

Example Question #54 : Organic Functional Groups

Cholic acid 3d

What is the unsaturation number of cholic acid (shown), which is a steroid?

Possible Answers:

Correct answer:

Explanation:

The unsaturation number is equal to the number of rings and pi bonds in a molecule.  Here, there are 4 rings and 1 double bond, so the unsaturation number is 5.  No formula is needed to calculate unsaturation number when a structural formula is given.

Cholic acid 3d

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