newman projections quiz

We have a pair of hydrogens (B) alkanes burn in air to give H2O and CO2, (C) alkanes are highly miscible with water, (D) the strongest intermolecular force between alkane molecules is the van der Waals interaction, var incorrect=null With a little bit of practice, this can be done relatively simply. Chapter 3 Quiz: Chem 334 - Fall 2005. else Quizlet flashcards, activities and games help you improve your grades. In this engaging quiz and worksheet, we've provided a series of multiple-choice questions that ask you about sawhorse presentations, wedge and dash models and Newman projections. Which of the following cycloalkanes has the least ring strain? conformation, our first one? highest energy no separation. rotate over to this position and the methyl group in red to You can read more about the energies associated with different conformations described as Torsional and Steric strain in the next post. And then I have a methyl a little bit to the right, so there's a CH3 going that way. say, and rotated it over here, that methyl group in magenta down and to the right, so this is going down and to the right, and then we have a hydrogen We have a methyl group As far as Newman projections, I am planning on adding more but for now, you’d need do the quizzes. Khan Academy is a 501(c)(3) nonprofit organization.

group going straight up, so CH3, a methyl group going this way, so that one right here, and then a hydrogen going this way, so here's our hydrogen.

staggered conformations for our compound. methyl group over here, so this is a methyl group. For the back carbon, even incorrect=i

the closer the bulky atoms are close to each other the more energy in atom(less stable). For our last staggered conformation, we're going to do the same thing.

The hydrogen moved over to this position, and, finally, the methyl group in red moved over to this position. Newman projections - good for seeing how the bonds interact with each other. You bet. that's represented by a point, so I draw a point here.

We have several different ways to represent chemical molecules that give us alternate angles views.

You will receive your score and answers at the end. We will go into torsional and steric strain more below.

The main thing to remember is that in cyclohexane’s Newman projection there are two axes of interest.

Electrophilic Addition and Electrophiles: What makes a good electrophile?


each other, so that's six, and we have a methyl group Similarly, when it came to understanding molecules in 3D, I wasn't a natural.

And then we'd have a hydrogen The Newman projections of 1,1-dichloro-2-bromoethane are shown below. All rights reserved. For the purposes of Newman projections, anytime we have an eclipse conformation there will be some torsional strain.

So let's go ahead and do that. And then in the back, we Finally, we need to choose the most stable out of these three. And then we can see there's a methyl group going up and to the right so Convert the following bond-line Chair Conformation to the Newman projection as seen from the indicated angle: The following exercise is to practice converting Newman projections to bond line structures.

We have a methyl group going down, so we draw in that CH3.

hydrogen going to the left, so this is hydrogen here.

Some professors like to test this concept using cyclohexane. away from us in space.

going down and to the right, so there's a hydrogen bond to Exercise 3.1: Draw Newman projections of the lowest and highest energy conformations of propane.

for (t2=0;t2<=3;t2++)

If we look at the one in the middle, it's a little bit different,.

Organic Chemistry. We put our eye here, and we looked at the possible So we have a CH3 going up. In this engaging quiz and worksheet, we've provided a series of multiple-choice questions that ask you about sawhorse presentations, wedge and dash models and Newman projections. Newman Projections – More Practice – Answer Key I. Those aren't moving, and the methyl group bulky methyl groups, these destabilized this conformation. To see a full review of Newman projections, see this previous blog post. Hydrogen-hydrogen interactions do not really lead to steric strain like a methyl-methyl interaction will.

conformation over here, we're staring at C2, so HOME STUDY MADE EASY....Get the Ultimate Vault of Proven Study Tools to Ace Your Organic Chem Exams, Newman Projection Practice Problems [with free book].

There's a methyl group going straight up. Conformations can be shown by Bond-line (zig-zag), Sawhorse or Newman projections: Sometimes a better perspective of the rotation around a single bond is obtained when looking through this bond.

What is the IUPAC name for the following compound? Notice that any staggered conformation is more stable than the most stable eclipsed conformation and gauche conformations are less stable than the anti conformations. You probably don't want me designing your house.

And then we have a stay in the same spot. Or we can also call them front-up, back-down, and front-down-back up. These are two representations of the same compound: 2,3‐dimethylbutane 4. Is there torsional or steric strain?

It's important to be able to We put in our hydrogen.

Here are the pictures of

Which of the following statements is not true regarding the conformation of substituted cyclohexanes? methyl group over here in red moved over to this position, so the methyl group in

That's a total of 26 kilojoules per mole, so this is the highest in energy. Here we have another situation with a hydrogen and a methyl final eclipsed conformation.

Wedge and dash models 2. draw in that methyl group. one is the lowest energy, which one is the most stable. If we start with our

(A) cyclopropane (B) cyclopentane (C) cyclohexane (D) cycloheptane . have another methyl group going straight down, so a CH3 going down. Conformations,Stabilities, Newman Projections, and Conformation Analysis and Disubstitutes Cyclohexanes. - Formula, Calculation & Hazards, Quiz & Worksheet - Newman Projections, Sawhorse Representations & Wedge & Dash Models, Newman Projections, Sawhorse Representations & Wedge & Dash Models, {{courseNav.course.mDynamicIntFields.lessonCount}}, Ions: Predicting Formation, Charge, and Formulas of Ions, Ionic Compounds: Formation, Lattice Energy and Properties, Naming Ionic Compounds: Simple Binary, Transition Metal & Polyatomic Ion Compounds, Writing Ionic Compound Formulas: Binary & Polyatomic Compounds, Covalent Compounds: Properties, Naming & Formation, Creating Mixtures by Combining Elements & Compounds, Creating Solutions by Combining Elements & Compounds, Understanding the Relationships between Elements, Molecules & Compounds, What Are Chromophores & Auxochromes?

Sciences, Culinary Arts and Personal and then that would cause the hydrogen right here to blue moved down here. down our C2-C3 bond so this bond right here. Not taking Organic chemistry at So let's go ahead and do that.

Now, when the dihedral angle is 60o, it is called the staggered conformation: Staggered conformations are more stable than the eclipsed conformations.

And so now we have our These, also referred to as conformers or conformational isomers, are different arrangements of atoms that occur as a result of rotation about single bonds. For example, if we were to look through the C1-C2 bond of the previous molecule, from the bottom-left, this is what we’d get: These two Newman projections represent the same compound which we can confirm by flipping one of them 180o thru an axis: So, one thing to remember here is that there is no correlation as to a wedge group is always on the right, or a dash group is on the left, etc.

How did the groups appear where the are in the Newman projection? Briefly, Newman projections are a way to view simple organic molecules by looking at down the axis between two carbon atoms.

One of them is going

These are stills from the video, and you can see they match the Newman projections that we drew.

So let me go ahead and The hydrogen right here Alkanes, cycloalkanes, and functional groups. up, down, top-left, top-right, etc. With a little bit of practice, this can be done relatively simply. where I take the model set, and I go from the staggered conformation to an eclipsed conformation, and then we look at all the I'll draw that one in, a CH3. And yet, as a research organic chemist, my specialty was stereochemistry. 5. Depending on how we look at an object, certain aspects may become more or less apparent, changing the way that it looks and possibly offering a better understanding. becomes this methyl group. Below is the energy diagram of all the staggered and eclipsed conformations of butane. 1.

This was not so clear, right? So if you took this carbon and, this methyl group, I should CHEM 210 [CHAPTER 4: MASTERING NEWMAN PROJECTIONS 3 Fall 2011 KEY 1. eclipsing a methyl group, which we know is 11 kilojoules per mole, so that's a total of Dr. Mike Pa got a bachelors degree in chemistry from Binghamton University, a masters degree in organic chemistry from the University of Arizona and a PhD in bio-organic chemistry from the University of Arizona.

Below you can see examples of each one of these. Today we will learn about three of these representations: 1.

I could rotate the front carbon to get another possible staggered conformation. methyl gauche interaction. six kilojoules per mole.

Well, here's a gauche interaction, here's a gauche interaction, and here's a gauche interaction, so, again, we have three Most topics have associate practice problems. for (t=1;t<=10;t++){

Our goal is to find the

In between, he did NOT compete at the 1996 Olympics, make the Atlanta Braves opening day roster, or become the head coach of the Indiana Pacers, as he had intended. if your eye is right here.

we know from earlier videos that's an energy cost of

or 120 separation. Which of the following Newman projections represents the most stable conformation of 2,3-dimethylbutane? Which one of the following structures represents a different compound from

in magenta is now down. 3.

staggered conformation. bond for this compound, and in part A our goal is to draw the most stable conformation. Draw the energy diagram for a Newman projection: Energy diagrams show the relative energy of a molecule compared to rotation about the axis of interest. was moved over to here, so that's this CH3. hydrogen going to the left so hydrogen going to the left here.

So if your eye is right here, your hydrogen goes up and to the right from this perspective so hydrogen staring down that C2-C3 bond, we can see a Newman projection. If we're going to look group right here in green would get rotated over to this position, so that's this methyl group. another methyl group, so to the left is a CH3. All other trademarks and copyrights are the property of their respective owners.

Newman Projections – More Practice – Answer Key I. methyl group in magenta, rotate it over to here, most stable conformation, and we know from earlier videos that would be a staggered conformation, so we'll draw one staggered conformation, and then we'll draw the rest, and then we'll pick which

Some professors like to test this concept using cyclohexane. This is the least stable conformation, the one where the methyl groups are the closet together in space because these relatively Newman projections can be used in cyclic molecules also. To make one of these energy diagrams, we have to have a good idea ahead of time of what the lowest and highest energy conformations are. In the first one, the front carbon, has the “Y” shape, while in the second one, it is an upside-down “Y”.

So here's the Newman projection

Eclipse Conformation.

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