We are open Saturday and Sunday!

Call Now to Set Up Tutoring:

(888) 888-0446

Organic Chemistry : Isomers

Study concepts, example questions & explanations for Organic Chemistry

Create An Account

All Organic Chemistry Resources

6 Diagnostic Tests 179 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #42 : Stereochemistry

Which of the following structures is equivalent to the enantiomer of the molecule whose Fischer Projection is shown below?

Screen shot 2015 09 21 at 2.08.29 pm

Screen shot 2015 09 21 at 2.20.32 pm

Possible Answers:

III

Correct answer:

Explanation:

The compound shown is SS, so we need to look for the compound that is RR.

Report an Error

Example Question #21 : Isomers

What is the Fischer projection of the following molecule?

Screen shot 2015 11 09 at 3.48.42 pm

Screen shot 2015 11 09 at 3.59.36 pm

Possible Answers:

III

Correct answer:

Explanation:

The absolute configuration of the given molecule is 2S,3R (amino group is R, methyl group is S). Putting the methyl group on the top and the alcohol on the bottom, this puts the amino group on the left, and the methyl group on the right. Recall that in the Fischer projection, the vertical bonds are dashed and are going into the plane of the screen/paper, while the horizontal bonds are wedges and are coming out of the plane of the screen/paper. One way to remember this is to think of Fischer projections as a skeleton (dashed vertical) wearing a bowtie (wedged horizontal).

Report an Error

Example Question #44 : Stereochemistry

What is the IUPAC name for the molecule shown?

Screen shot 2015 11 09 at 4.10.48 pm

Possible Answers:

S-3-methylbut-1-en-4-ol

S-2-methylbut-3-en-1-ol

R-3-methylbut-1-en-4-ol

R-2-methylbut-3-en-1-ol

Correct answer:

S-2-methylbut-3-en-1-ol

Explanation:

The molecule's highest priority functional group is the -OH group, therefore, numbering starts at the left-most carbon. The absolute configuration of the molecule at carbon is S.

Report an Error

Example Question #44 : Stereochemistry

What is the IUPAC name for the molecule shown?

Screen shot 2015 11 12 at 6.01.33 pm

Possible Answers:

(2R,3S)-3-methyl-2-pentanol

(2S,3S)-3-methyl-2-pentanol

(2S,3R)-3-methyl-2-pentanol

(2R,3R)-3-methyl-2-pentanol

Correct answer:

(2R,3S)-3-methyl-2-pentanol

Explanation:

Carbon number : hydroxyl is first priority, The rest of the molecule is second, methyl is third. Placing in back makes $1\rightarrow 2\rightarrow 3$ go clockwise. Therefore, it is R. Carbon number : alkyl with hydroxyl is first priority, The rest of the molecule is second, methyl is third. Placing in back makes $1\rightarrow 2\rightarrow 3$ go counterclockwise. Therefore, it is S.

Report an Error

Example Question #22 : Isomers

Which of the following applies to the molecule shown?

Screen shot 2015 11 09 at 5.11.34 pm

Possible Answers:

Correct answer:

Explanation:

Aldehyde group gets first priority; therefore, aldehyde carbon is carbon number . Aldehyde group is first priority, alkyne group is second priority, methyl group is third priority. $1\rightarrow 2\rightarrow 3$ is clockwise, so the molecule is R.

Report an Error

Example Question #22 : Help With Enantiomers

What is the IUPAC name of the molecule below?

Screen shot 2015 11 09 at 5.21.30 pm

Possible Answers:

S-3-butanamine

S-2-butanamine

R-2-butanamine

R-3-butanamine

Correct answer:

R-2-butanamine

Explanation:

At the chiral carbon, the amino group is first priority, the ethyl group is second priority, and the methyl group is third priority. $1\rightarrow 2\rightarrow 3$ is clockwise when putting H in the back, so the molecule is R.

Report an Error

Example Question #21 : Help With Enantiomers

What is the IUPAC name of the compound shown?

Possible Answers:

(2R,3R)-3-propylpent-4-en-2-ol

(2R,3R)-3-vinyl-2-pentanol

(3S,4R)-3-propylpent-1-en-4-ol

(2R,3S)-3-propylpent-4-en-2-ol

Correct answer:

(2R,3R)-3-propylpent-4-en-2-ol

Explanation:

Numbering of carbon chain goes from hydroxyl group (on carbon ) to double bond (carbons and ). Hydroxyl carbon and propyl carbon are both R.

Report an Error

Example Question #24 : Help With Enantiomers

What are the absolute configurations at carbons labelled , , and in the molecule below, respectively?

Screen shot 2015 11 09 at 6.00.01 pm

Possible Answers:

S, R, S

R, S, R

S, R, R

S, S, R

Correct answer:

S, R, R

Explanation:

Carbon number : Hydroxyl is , group going up is , group going down is . Therefore it's S. Carbon number : Group going to chloride is , group going to hydroxyl is , methyl is . Therefore it's R. Carbon number : Chloride is , group going up is , group going down is . Therefore it's R.

Report an Error

Example Question #51 : Stereochemistry

What is the IUPAC name for the molecule shown below?

Screen shot 2015 11 09 at 6.07.55 pm

Possible Answers:

(4E,3S)-3,5-dimethyl-4-pentene

(4Z,3R)-3,5-dimethyl-4-pentene

(3E,5R)-3,5-dimethyl-3-pentene

(3E,5S)-3,5-dimethyl-3-pentene

Correct answer:

(3E,5S)-3,5-dimethyl-3-pentene

Explanation:

Numbering goes from right to left, so double bond is attributed to carbon #. The double bond is E, because higher priority groups are across the double bond from each other. Carbon # is S.

Report an Error

Example Question #22 : Help With Enantiomers

Which of the following statements best describes enantiomers?

Possible Answers:

Enantiomers are stereoisomers that are achiral.

None of these are true.

Enantiomers are stereoisomers that have symmetry along a mirror plane.

Enantiomers are stereoisomers that have non-identical mirror image conformations.

Enantiomers are stereoisomers that have identical mirror image conformations.

Correct answer:

Enantiomers are stereoisomers that have non-identical mirror image conformations.

Explanation:

Enantiomers are stereoisomers that have non-identical mirror image conformations and they are chiral as well. They are also non-superimposable which means, when placed on top of each other, they do not look the same.

Report an Error

View Organic Chemistry Tutors

Mikhail
Certified Tutor

Tbilisi State University Georgia, Bachelor of Science, Chemistry. Tbilisi State University, Doctor of Science, Organic Chemis...

View Organic Chemistry Tutors

Thomas
Certified Tutor

Saint Josephs University, Bachelor of Science, Biology, General. Thomas Jefferson University, Doctor of Medicine, Community H...

View Organic Chemistry Tutors

Tanei
Certified Tutor

Augusta State University, Bachelor of Science, Chemistry. The University of Tennessee, Doctor of Science, Organic Chemistry.

All Organic Chemistry Resources

6 Diagnostic Tests 179 Practice Tests Question of the Day Flashcards Learn by Concept

Organic Chemistry Tutors in Top Cities:

Popular Courses & Classes

Spanish Courses & Classes in San Diego, Spanish Courses & Classes in Dallas Fort Worth, ACT Courses & Classes in Atlanta, ACT Courses & Classes in San Diego, MCAT Courses & Classes in New York City, ISEE Courses & Classes in Miami, GRE Courses & Classes in Los Angeles, ACT Courses & Classes in Los Angeles, GRE Courses & Classes in Atlanta, LSAT Courses & Classes in Denver

Popular Test Prep

SAT Test Prep in Denver, ACT Test Prep in Los Angeles, SAT Test Prep in Atlanta, GMAT Test Prep in Phoenix, ACT Test Prep in Atlanta, LSAT Test Prep in Denver, SSAT Test Prep in Houston, SSAT Test Prep in Denver, SAT Test Prep in Seattle, MCAT Test Prep in Houston

DMCA Complaint

If you believe that content available by means of the Website (as defined in our Terms of Service) infringes one or more of your copyrights, please notify us by providing a written notice (“Infringement Notice”) containing the information described below to the designated agent listed below. If Varsity Tutors takes action in response to an Infringement Notice, it will make a good faith attempt to contact the party that made such content available by means of the most recent email address, if any, provided by such party to Varsity Tutors.

Your Infringement Notice may be forwarded to the party that made the content available or to third parties such as ChillingEffects.org.

Please be advised that you will be liable for damages (including costs and attorneys’ fees) if you materially misrepresent that a product or activity is infringing your copyrights. Thus, if you are not sure content located on or linked-to by the Website infringes your copyright, you should consider first contacting an attorney.

Please follow these steps to file a notice:

You must include the following:

A physical or electronic signature of the copyright owner or a person authorized to act on their behalf; An identification of the copyright claimed to have been infringed; A description of the nature and exact location of the content that you claim to infringe your copyright, in \ sufficient detail to permit Varsity Tutors to find and positively identify that content; for example we require a link to the specific question (not just the name of the question) that contains the content and a description of which specific portion of the question – an image, a link, the text, etc – your complaint refers to; Your name, address, telephone number and email address; and A statement by you: (a) that you believe in good faith that the use of the content that you claim to infringe your copyright is not authorized by law, or by the copyright owner or such owner’s agent; (b) that all of the information contained in your Infringement Notice is accurate, and (c) under penalty of perjury, that you are either the copyright owner or a person authorized to act on their behalf.

Send your complaint to our designated agent at:

Charles Cohn Varsity Tutors LLC
101 S. Hanley Rd, Suite 300
St. Louis, MO 63105

Or fill out the form below:

Do not fill in this field

Contact Information

* Full legal name

Company name

* Phone number

* Email address

Address

* Address1

Address2

* City

* State

* Zipcode

* Country

Complaint Details

* URL of copyrighted work (where your original material is located)

* Please describe the copyrighted work so that it may be easily identified

I am the owner, or an agent authorized to act on behalf of the owner of an exclusive right that is allegedly infringed.

I have a good faith belief that the use of the material in the manner complained of is not authorized by the copyright owner, its agent, or the law.

This notification is accurate.

I acknowledge that there may be adverse legal consequences for making false or bad faith allegations of copyright infringement by using this process.

* Signature (your digital signature is legally binding)

HIGH SCHOOL

GRADUATE SCHOOL

K-8

Search 50+ Tests

math tutoring

science tutoring

foreign languages

elementary tutoring

other

Search 350+ Subjects

Organic Chemistry : Isomers

Study concepts, example questions & explanations for Organic Chemistry

All Organic Chemistry Resources

Example Questions

Example Question #42 : Stereochemistry

Example Question #21 : Isomers

Example Question #44 : Stereochemistry

Example Question #44 : Stereochemistry

Example Question #22 : Isomers

Example Question #22 : Help With Enantiomers

Example Question #21 : Help With Enantiomers

Example Question #24 : Help With Enantiomers

Example Question #51 : Stereochemistry

Example Question #22 : Help With Enantiomers

All Organic Chemistry Resources

Report an issue with this question

DMCA Complaint

Contact Information

Address

Complaint Details

Email address:
Your name:
Feedback: