Organic Chemistry : Organic Concepts
Study concepts, example questions & explanations for Organic Chemistry
All Organic Chemistry Resources
Example Questions
Example Question #43 : Organic Functional Groups
Which functional groups are present in the pictured molecule?
Phenyl, ketone, amine, acid anhydride
Phenyl, aldehyde, amine, acid anhydride
Phenyl, ketone, amide, ester
Phenyl, ketone, amine, ester
Phenyl, ketone, amine, acid anhydride
This picture shows each functional group in its own box.
1. Phenyl
2. Ketone
3. Amine
4. Acid anhydride
Example Question #2 : Identifying Other Organic Compounds
Which of the following compounds has the molecular formula, 
Hexyne
Benzene
Hexane
Hexene
Hexene
The molecular formula 
Example Question #3 : Identifying Other Organic Compounds
What kind of organic compounds contain an 
All of these
Aldehydes
Alcohols
Ketones
Alcohols
By definition, alcohols are compounds that contain an 
Example Question #4 : Identifying Other Organic Compounds
Ethanol 
Tertiary alcohol
Secondary alcohol
Organic acid
Primary alcohol
Primary alcohol
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 
Example Question #7 : Identifying Other Organic Compounds
What is the unsaturation number of cholic acid (shown), which is a steroid?
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.
Example Question #51 : Organic Functional Groups
Which of the following is an appropriate solvent for synthesizing Grignard reagents?
Grignard reagents are very strong bases, and therefore can be spoiled by protons. Grignard reagents are so basic in fact that any protic solvent will render them useless. Dimethyl ether is the only non-protic solvent, and is therefore the correct answer.
Example Question #52 : Organic Functional Groups And Molecules
What is the functional group present in the following molecule known as?
Ether
Ester
Carboxylic acid
Aldehyde
Ketone
Ether
The molecule pictured above is known as an ether because it contains an oxygen atom within the sequence of a carbon chain. (An oxygen atom bonded to two carbons in a carbon chain).
Therefore the correct answer is ether. All other answer choices are carbonyls, meaning that they contain a carbon atom double bonded to an oxygen atom.
Example Question #53 : Organic Functional Groups
I.
II. 
III. 
IV. 
Which option gives the order of decreasing acidity of the molecules provided?
III>IV>II>I
IV>II>III>I
I>III>II>IV
IV>III>I>II
IV>III>I>II
IV>III>I>II
The most acidic compound is option IV because it contains a carboxylic acid group which is the most acidic organic functional group. Phenols are weak acids. Alcohols in solution are slightly less acidic than water and therefore are slightly basic.
Example Question #54 : Organic Functional Groups
What is the IUPAC name for the compound shown?
Cyclopentane
1-Cyclopentane
Cyclopentene
1-Cyclopentene
Cyclopentene
The molecule's longest carbon chain has 5 carbons (thus, "pent"), and the one double bond makes it an alkENE (thus "pentene"). The longest chain is a ring structure (thus "cyclopentene"). Because the IUPAC rules automatically assign the location of the first double bond to carbons 1 and 2, there is no need for a number locand.
Example Question #55 : Organic Functional Groups
What is the IUPAC name for the compound shown?
1,3-Butene
1,3-Butadiene
1,2-Butadiene
Butadiene
1,3-Butadiene
The molecule's longest carbon chain has 4 carbons (thus, "but"), and the presence of two double bonds makes it an alkENE, more specifically, a diene (thus "butadiene"). Because there is more than one way in which the double bonds can be arranged (between C1-C2 and C2-C3, or between C1-C2 and C3-C4), it's important to place locants indicating the lower-numbered carbon in each double bond.
Certified Tutor
Certified Tutor
All Organic Chemistry Resources
