Organic Chemistry Flashcards
Friedrich Wohlers work on isomerism
was able to curb the growth of vitalism
by disproving the old notion that organic
compounds can only come from organic
sources. Which among the following was
the product produced in Wohler’s
synthesis?
A: Ammonium Cyanate B: Urea
C: Carbon Disulfide D: Acetic Acid
b
Who among the following constituted
the concept of resonance in order to take
explain the structures of molecules or
ions that are not accounted for by the
octet rule?
A: August Kekule B: Linus Pauling
C: Gilbert Lewis D: Robert Robinson
b
Which among the following statements
highlights the actual difference between
Lewis Structures and Resonance
A: Lewis structures shows how the atoms
of a molecule are bonded to one another
while the resonance represents the
different substituent combinations
B: Lewis structures focuses on the
localization of electrons while resonance
features the electrons capacity of being
delocalized among the atoms
C: Resonance structures represent the
various ways in which a molecule can be
drawn while the Lewis structure
represents the accepted “True” structure
of the molecule
D: A resonance structure and Lewis
structure are virtually indistinguishable
from one another
b
Determine whether each of the
following statements pertaining to
constitutional isomers is TRUE or FALSE.
[a.] They have the same molecular formula
[b.] They have the same molecular weight
[c.] They have the same connectivity to
their atoms
[d.] They have the same physical
properties
b
Explain the difference in structure
between a saturated hydrocarbon from an
unsaturated hydrocarbon.
A: Any of these
B:A saturated hydrocarbon only contains
carbon-carbon single bonds while an
unsaturated hydrocarbon contains one or
more carbon-carbon double or triple bonds
C: A saturated hydrocarbon is used mainly
in cheaper forms of gasolines for vehicle
use while unsaturated hydrocarbons
compose most of the gasoline formulae
used by current gasoline manufacturers
D: A saturated hydrocarbon can no longer
accept any hydrocarbon or inorganic
element, and compound while an
unsaturated hydrocarbon is more flexible
in reaction mechanisms
b
Which among the following can be the
possible structures of a molecule that
has the molecular formula C5H8?
A: Alkane and Alkene with a single double
bond
B: Alkene with a single double bond and
Alkyne with a single triple bond
C: Cycloalkane and an Alkene with two
double bonds
D: Cycloalkene with a single double bond
and two rings
d
An entomologist extracted pheromone
samples from a moth captured in the wilds
of Maguindanao. Based on a spectroscopic
analysis, the molecule is a 2-methyl
branched alkane. If it has a molecular
weight of 254, what is the IUPAC name of
the alkane?
A: 2,3-dimethylhexadecane
B: 2-methylheptadecane
C: 2,2,4-trimethylpentadecane
D: 2-methyloctadecane
b
Which among the following represents
the impact of Odd Hassel’s work in the
field of Organic Chemistry?
A: The difference between Eclipsed
Conformation and Staggered Conformation
observed in alkanes
B: The chair conformation of cyclohexane
C: The measurement of the dihedral angle
observed in gauche conformation
D: The identification of the various
sources of strain a cyclohexane may
experience
b
Which among the following statements
best describe the most stable
conformation of 1-isopropyl-3-
methylcyclohexane?
A: The methyl substituent is attached in
the equatorial position at C3 and is
trans to the isopropyl substituent at C1
B: The isopropyl substituent is attached
in the equatorial position at C1 and is
trans to the methyl substituent at C3
C: The methyl substituent is attached in
the axial position in C3 and is cis to
the isopropyl substituent at C1
D: The isopropyl substituent is attached
in the axial position at C1 and is cis to
the methyl substituent at C3
b
Which has a higher absolute entropy
at a temperature of 25 deg C,
cyclopropane or propylene? Why?
A: Both have the same absolute entropy at
normal temperature
B: Propylene due to the free rotation
around the carbon-carbon single bond
C: Cyclopropane due to the free rotation
around the carbon-carbon double bond
D: None of these
b
Which among the following statements
is true regarding the boiling point and
density of an unsubstituted alkane and a
halogen-substituted alkane?
A:Both the boiling point and density of a
halogen-substituted alkane is larger than
that of its unsubstituted alkane
counterpart.
B: Both the boiling point and density of
an unsubstituted alkane is larger than
that of its halogen-substituted alkane
counterpart.
C: The boiling point of an unsubstituted
alkane is larger than its halogen
substituted counterpart but their density
are equal.
D: The density of a halogen substituted
alkane is larger than that of its
unsubstituted alkane counterpart but
their boiling points are the same.
a
How is a carbocation stabilized by
the alkyl groups attached to it?
A: The alkyl groups release an electron
density on the positively charged carbon
in order to disperse the positive charge
B: The electrons that are sigma to the
positively charged carbon has its orbital
overlap with the vacant p orbital of the
positively charged carbon
C: The leaving group transfers some of
its electrons to the carbocation in order
to disperse the positive charge
D: The electrons in the alpha-Carbon
hydrogen bonds greatly distributes the
positive charge as opposed to the betacarbon hydrogen bonds
a
Which among the following reagents
will not synthesize cyclohexanol if the
starting material is cyclohexene?
A: [1] Diborane, [2] Hydrogen Peroxide,
Sodium Hydroxide
B: Bromine and Water
C: Water with Sulfuric Acid
D: [1] 9-BBN, [2] Basic Hydrogen Peroxide
b
Which among the following organic
compounds will be produced when 2,4-
dimethyl-3-pentanol is heated to 120 deg
C in the presence of sulfuric acid?
A: 2,4-dimethyl-1 pentene
B: 2,4-dimethyl-2-pentene
C: Both A and B
D: Neither A and B
c
Which among the following sequence of
organic reactions will produce 1-bromo-2-
propanol if the starting material for the
synthesis is 2-propanol
A: [1] H2SO4, heat [2] B2H6, diglyme [3]
basic H2O2
B: [1] H2SO4, heat [2] Br2, H2O
C: [1] H2SO4, heat [2] Peroxyacetic acid
D: Synthesis is not feasible with the
given starting material
b
