labster/ quiz org chem midterm Flashcards
you can see the 2d structure of two hydrocarbons. can you spot the difference between them
the bonds are different
alkane with 6 carbon atoms
hexane
one of the major constituent of gasoline
hexane
correct ending for a hydrocarbon with no or double triple bond
pentane
used for alknaes, single bonds only
-ane
which of this the carbon name for hydrocarbon with the carbons, and a double bond
ethene
which compound is being shown here on the holo-table right now?
but-7-ene
which compound is not present
ethane
is best at getting a quick of the number of each element in the compound?
molecular formula
which type of hydrocarbon will not react with bromine
alkanes
which of the following unknown compound do you think is saturated hydrocarbon?
unknown compound 2
do you know which role the double bond plays in the electrophilic
nucleophile
for these intermeditae, it seems afew carbocations have formed. which is the least stable type of carbocations?
methyl cation (cat-ion)
identify the connect combination of major minor products
major 2- bromobutane; minor 1-bromobutane
what is the main differenece the displayed and the partially condensed formula?
some bonds are implied in the partially condensed. whereas all bonds are shown in the displayed formula
what do you think the core rules for the skeletal type?
carbons are implied at the line corners and ending and the hydrogens are implied in general
Which type of isomerism does not involve
chirality?
Constitutional isomerism
What instrument is used to measure optical
activity?
Polarimeter
What does it mean when a molecule is achiral?
It is superposable on its mirror image
What is the basis for assigning priority in the R/S
system?
Atomic number of atoms attached to the
stereocenter
A dextrorotatory compound rotates planepolarized
light:
Clockwise
Which of the following is not a characteristic of
enantiomers?
They have different boiling points
Why do enantiomers have different biological
effects?
They interact differently with
chiral biological molecules
What is a meso compound
A compound with
multiple stereocenters but no chirali
Which of the following conditions must be met
for a molecule to exhibit optical activity
It must be chiral
If the priority order of groups is read in a
clockwise direction, what is the configuration?
R
Which biological molecules are often chiral?
All of the above
Which of the following is a characteristic of
enantiomers?
All of the above
What is the most common cause of chirality in
organic molecules?
Presence of a carbon with four
different groups attached
Which of the following is an example of
diastereomers?
cis- and trans-1,2-dichloroethene
How can one separate a racemic mixture into its
individual enantiomers
Using a chiral resolving agent
What is the effect of (R)-naproxen in the body?
Liver toxicity
How many stereoisomers are possible for a
molecule with two stereocenters
4
What is the relationship between (R)-2-butanol
and (S)-2-butanol?
Enantiomers
The R/S system is used to ________.
Differentiate between enantiomers
The formula for calculating the maximum number
of stereoisomers for a molecule with n
stereocenters is:
2ⁿ
what happens when plane-polarized light passes
through an optically active compound?
It is rotated either clockwise or counterclockwise
Why do biological systems often use only one
enantiomer of a chiral compound
Enzymes are chiral and selective
The configuration of a molecule can be
determined using
Both a and c
What does “chiral” mean in chemistry?
A molecule that is not superposable on its
mirror image
How many stereoisomers are possible for a
molecule with three stereocenters?
8
How do diastereomers differ from enantiomers?
Diastereomers are nonsuperposable
and not mirror images
A racemic mixture contains:
Equal amounts of R and S enantiomers
HCI4
Hydrochloride Acid
Which of the following compounds is most likely
to be chiral?
2-Butanol
Soduim hydroxide
NaOH
The solution has turned red. What do
you think result means?
The Unknown compound
contains a primary aromatic amine
c=o
oxo
cho
formyl
