labster/ quiz org chem midterm

Question 1

you can see the 2d structure of two hydrocarbons. can you spot the difference between them

Answer 1

the bonds are different

Question 2

alkane with 6 carbon atoms

Answer 2

hexane

Question 3

one of the major constituent of gasoline

Answer 3

hexane

Question 4

correct ending for a hydrocarbon with no or double triple bond

Answer 4

pentane

Question 5

used for alknaes, single bonds only

Answer 5

-ane

Question 6

which of this the carbon name for hydrocarbon with the carbons, and a double bond

Answer 6

ethene

Question 7

which compound is being shown here on the holo-table right now?

Answer 7

but-7-ene

Question 8

which compound is not present

Answer 8

ethane

Question 9

is best at getting a quick of the number of each element in the compound?

Answer 9

molecular formula

Question 10

which type of hydrocarbon will not react with bromine

Answer 10

alkanes

Question 11

which of the following unknown compound do you think is saturated hydrocarbon?

Answer 11

unknown compound 2

Question 12

do you know which role the double bond plays in the electrophilic

Answer 12

nucleophile

Question 13

for these intermeditae, it seems afew carbocations have formed. which is the least stable type of carbocations?

Answer 13

methyl cation (cat-ion)

Question 14

identify the connect combination of major minor products

Answer 14

major 2- bromobutane; minor 1-bromobutane

Question 15

what is the main differenece the displayed and the partially condensed formula?

Answer 15

some bonds are implied in the partially condensed. whereas all bonds are shown in the displayed formula

Question 16

what do you think the core rules for the skeletal type?

Answer 16

carbons are implied at the line corners and ending and the hydrogens are implied in general

Question 17

Which type of isomerism does not involve
chirality?

Answer 17

Constitutional isomerism

Question 18

What instrument is used to measure optical
activity?

Answer 18

Polarimeter

Question 19

What does it mean when a molecule is achiral?

Answer 19

It is superposable on its mirror image

Question 20

What is the basis for assigning priority in the R/S
system?

Answer 20

Atomic number of atoms attached to the
stereocenter

Question 21

A dextrorotatory compound rotates planepolarized
light:

Answer 21

Clockwise

Question 22

Which of the following is not a characteristic of
enantiomers?

Answer 22

They have different boiling points

Question 23

Why do enantiomers have different biological
effects?

Answer 23

They interact differently with
chiral biological molecules

Question 24

What is a meso compound

Answer 24

A compound with
multiple stereocenters but no chirali

Question 25

Which of the following conditions must be met for a molecule to exhibit optical activity

Answer 25

It must be chiral

Question 26

If the priority order of groups is read in a clockwise direction, what is the configuration?

Answer 26

R

Question 27

Which biological molecules are often chiral?

Answer 27

All of the above

Question 28

Which of the following is a characteristic of enantiomers?

Answer 28

All of the above

Question 29

What is the most common cause of chirality in organic molecules?

Answer 29

Presence of a carbon with four different groups attached

Question 30

Which of the following is an example of diastereomers?

Answer 30

cis- and trans-1,2-dichloroethene

Question 31

How can one separate a racemic mixture into its individual enantiomers

Answer 31

Using a chiral resolving agent

Question 32

What is the effect of (R)-naproxen in the body?

Answer 32

Liver toxicity

Question 33

How many stereoisomers are possible for a molecule with two stereocenters

Answer 33

4

Question 34

What is the relationship between (R)-2-butanol and (S)-2-butanol?

Answer 34

Enantiomers

Question 35

The R/S system is used to ________.

Answer 35

Differentiate between enantiomers

Question 36

The formula for calculating the maximum number of stereoisomers for a molecule with n stereocenters is:

Answer 36

2ⁿ

Question 37

what happens when plane-polarized light passes through an optically active compound?

Answer 37

It is rotated either clockwise or counterclockwise

Question 38

Why do biological systems often use only one enantiomer of a chiral compound

Answer 38

Enzymes are chiral and selective

Question 39

The configuration of a molecule can be determined using

Answer 39

Both a and c

Question 40

What does "chiral" mean in chemistry?

Answer 40

A molecule that is not superposable on its mirror image

Question 41

How many stereoisomers are possible for a molecule with three stereocenters?

Answer 41

8

Question 42

How do diastereomers differ from enantiomers?

Answer 42

Diastereomers are nonsuperposable and not mirror images

Question 43

A racemic mixture contains:

Answer 43

Equal amounts of R and S enantiomers

Question 44

HCI4

Answer 44

Hydrochloride Acid

Question 45

Which of the following compounds is most likely to be chiral?

Answer 45

2-Butanol

Question 46

Soduim hydroxide

Answer 46

NaOH

Question 47

The solution has turned red. What do you think result means?

Answer 47

The Unknown compound contains a primary aromatic amine

Question 48

c=o

Answer 48

oxo

Question 49

cho

Answer 49

formyl