Stereochemistry Organic I

Question 1

Give the double bond stereochemistry of the following compounds.

Accepted Answer

I is E; II is Z, E = trans and Z = cis

Question 2

In expectation of the fun

Accepted Answer

Organic chemistry is a difficult subject

Question 3

Deuteroethanol shown here is

Accepted Answer

S -

Question 4

Research indicates that ibuprofen is a mixture of two enantiomers, that is, molecules that

Accepted Answer

are mirror images of one another.

Question 5

Trying to fit the gloves. We are having the right enantiomer only. True or false?

Accepted Answer

True

Question 6

Identify the diastereoisomer.

Accepted Answer

A pair of isomers that are not enantiomers - the 2 in the middle.

Question 7

Anti and gauche are conformers and the possible degrees are

Accepted Answer

180 and 60 Degrees

Question 8

Cis/trans and E/Z isomers are examples of stereoisomers

Accepted Answer

Yes

Question 9

Cis or trans?

Accepted Answer

trans

Question 10

Does a racemic mixture rotate plain polarised light?

Accepted Answer

No

Question 11

What are the relationships between those compds

Accepted Answer

Diastereomers

Question 12

What is a racemic mixture of enantiomers?

Accepted Answer

A 50:50 ratio of both enantiomers of an isomer

Question 13

What is the definition of a diastereoisomer?

Accepted Answer

non superimposable, not mirror images

Question 14

Due to the fact that carbon is tetrahedral, what opportunity arises?

Accepted Answer

Chirality

Question 15

Enantiomers are...

Accepted Answer

mirror images, but not superimposable

Question 16

The compounds below are?

Accepted Answer

1, 3 - trans diastereomers

Question 17

How do you separate enantiomers?

Accepted Answer

By resolution: reaction is selective or separation by physical methods

Question 18

What is stereochemistry?

Accepted Answer

The study of the 3D shape of molecules

Question 19

Carvon shown here is

Accepted Answer

S -

Question 20

The two snails are

Accepted Answer

Enantiomers

Question 21

What is the stereochemical designation for this molecule?

Accepted Answer

Z

Question 22

If the enantiomer had the configuration (R,R), the enantiomer configuration would be

Accepted Answer

R,R

Question 23

Protonation is when

Accepted Answer

pH goes down and a proton is added

Question 24

Stereochemistry analyzes conformations and ...

Accepted Answer

Configurations

Question 25

Equatorials are thermodynamically preferred. Which of these chair conformations is the most stable?

Accepted Answer

B

Question 26

L-dopa is a pharmaceutical drug that occurs as two enantiomers. "Enantiomers" are molecules that:

Accepted Answer

are mirror images of one another.

Question 27

Which diastereoisomer is most stable?

Accepted Answer

B

Question 28

Which of the following is the definition of chirality?

Accepted Answer

The non-superimposability an object on its mirror image

Question 29

Look from the left. Which of these bond-line drawings matches the Fisher projection shown here?

Accepted Answer

D

Question 30

Which of these Newman Projections is the most stable?

Accepted Answer

C

Question 31

This is racemic mixture?

Accepted Answer

False

Question 32

What is the geometry of the sp3 hybridized CARBON?

Accepted Answer

tetrahedral geometry

Question 33

What is the definition of diastereomers?

Accepted Answer

Chiral compounds that are not enantiomers

Question 34

A racemic mixture of two enantiomers has an enantiomeric excess of...

Accepted Answer

0%

Question 35

What is the stereochemical relationship between these two products?

Accepted Answer

Diastereomers

Question 36

Identify the defintion of a diastereoisomer.

Accepted Answer

A pair of isomers that are not enantiomers.

Question 37

If the enantiomer had the configuration (R,R), the diastereoisomer configuration would be

Accepted Answer

S,R

Question 38

What can you call Cis- and Trans- isomers?

Accepted Answer

configurational isomers

Question 39

The Fisher projections of a carbohydrate has _____ or ketone at the top of the drawing.

Accepted Answer

Aldehyde

Question 40

Which is an example of a diastereoisomer?

Accepted Answer

hand and foot

Question 41

Review: What is an optical isomer?

Accepted Answer

Compound of carbon with four different atoms or groups attached to it

Question 42

Cis-trans isomers ___?

Accepted Answer

have have altered arrangement of atoms around an unflexible double bond

Question 43

A racemate (or racemic mixture) has:

Accepted Answer

equal amounts of both optical isomers

Question 44

Fisher projection here is

Accepted Answer

All of the above

Question 45

An optical isomer with a chiral atom:

Accepted Answer

has 4 different groups around it

Question 46

What is the term for the percentage of extra stereoisomer in a mixture?

Accepted Answer

enatiomeric excess, few extra one handed gloves

Question 47

Newman Projections are?

Accepted Answer

Conformational isomers

Question 48

What is the stereochemical designation for this molecule?

Accepted Answer

S

Question 49

Equal amount of the two enantimers:

Accepted Answer

racemic mixture

Question 50

Is the following compound a MESO compound?

Accepted Answer

Yes

Question 51

Eclipsed are conformers with degrees

Accepted Answer

0 Degrees both expressions

Question 52

Organic Chemistry is...

Accepted Answer

the study of carbon compounds, their structure and changes.

Question 53

Name the following diastereoisomer

Accepted Answer

(2S,3S) – 2 – chloro – 3 – butanol

Question 54

Meso means

Accepted Answer

No rotation of the light

Question 55

Is this meso?

Accepted Answer

No

Question 56

What happens when plane polarised light is passed through a racemic mixture?

Accepted Answer

The rotation of light cancels out

Question 57

What happens when plane polarised light is passed through a pure R-isomer?

Accepted Answer

The plane of the light is rotated in one direction - RIGHT!

Question 58

Meso means

Accepted Answer

Middle mirror plane

Question 59

L - Dopa shown here is

Accepted Answer

S -

Question 60

Define a Racemic Mixture

Accepted Answer

2 optical isomers of a chiral compound in equal amounts.

Question 61

What is the meaning of the word ORGANIC?

Accepted Answer

All of the above

Question 62

What is the stereochemical description of the relationship between this pair of molecules with 2 chiral centers?

Accepted Answer

diastereomers

Question 63

Which of the three pairs is a pair of E and Z isomers?

Accepted Answer

1

Question 64

Why do racemic mixtures form in the laboratory experiments?

Accepted Answer

Due to equal chance of attack on the planar carbonyl or other planar group

Stereochemistry Organic I

Questions 67

Stereochemistry Organic I

Questions 67