CHM 124 Exam Questions With Complete
Answers 100% Solved
Consider the properties of pentane and 2,3,4 trimethylpentane. Of the two, pentane would
have the - ANSWER lower mass and lower boiling point
Which does not affect the boiling point of an organic compound? - ANSWER the mass of the
sample that is boiling
Which of these C5H10 structural isomers would you expect to have the highest boiling point?
- ANSWER 2-hexene
Consider the properties of pentane and octane. Of the two, octane would have the - ANSWER
higher mass and higher boiling point
Consider the properties of octane and 2,3,4-trimethylpentane. Of the two, octane would have
the - ANSWER same mass and higher boiling point
Which alkane reactant would consume the most oxygen gas when undergoing complete
combustion? - ANSWER one mole of 2,3-dimethylhexane, one mole of
2,3,4-trimethylpentane, one mole of octane
Which is true of a pair of geometric stereoisomers?
,They have different .... - ANSWER physical properties
These molecules all contain eight carbon atoms. Which is not a structural isomer of the other
three? - ANSWER 3,3-dimethyl-1-hexyne
Which is the best description of molecules that are geometric stereoisomers? - ANSWER same
structure, but different spatial arrangement
Which is true of a pair of structural isomers? They have the same.... - ANSWER chemical
formula
Which of these structural isomers could not have cis and trans geometric stereoisomers? -
ANSWER 1,1-dichlorocyclopentane
Which correctly lists these compounds in order of increasing strength of inter-particle
attractive forces? - ANSWER CH2=CH2 < CH3F < KF
A student used a butyl substituent (i.e.,n-butyl, sec-butyl, tert-butyl, isobutyl) to name an
alkene. What is the correct IUPAC name for the molecule the student called n-butyl ethene? -
ANSWER 1-hexene
Which of these is not correct IUPAC nomenclature for an alkene? - ANSWER
1-methyl-1-butene
, A student draws an alkyne by drawing an ethyne, then attaching an alkyl substituent to each
of its two carbons. What is the IUPAC name of the alkyne created by adding ethyl and
sec-butyl groups to the carbons of ethyne? - ANSWER 5-methyl-3-heptyne
A student named a compound: 2-ethyl-3-methyl-2-butene. Although this represents the
connectivity of the molecule, it is not a valid IUPAC name. Which is the correct IUPAC name
for this compound? - ANSWER 2,3-dimethyl-2-pentene
A student draws an alkyne by drawing an ethyne, then attaching an alkyl substituent to each
of its two carbons. What is the IUPAC name of the alkyne created by adding methyl and
isobutyl groups to the carbons of ethyne? - ANSWER 5-methyl-2-hexyne
2-butanone can be converted to disec-butyl ether via a multi-step reaction sequence. Which is
the correct sequence of reagents/reaction conditions? - ANSWER H2 with Pt, then H2SO4 at
140oC
Two functional group reactions are performed in sequence.
Reaction #1: Dehydration of 1-butanol.
Reaction #2: Addition of HBr to the product of Reaction #1.
Which would be the major final product? - ANSWER 2-bromobutane
Which is the major product obtained from the dehydration of 2,3-dimethyl-3-pentanol? -
ANSWER 2,3-dimethyl-2-pentene
Answers 100% Solved
Consider the properties of pentane and 2,3,4 trimethylpentane. Of the two, pentane would
have the - ANSWER lower mass and lower boiling point
Which does not affect the boiling point of an organic compound? - ANSWER the mass of the
sample that is boiling
Which of these C5H10 structural isomers would you expect to have the highest boiling point?
- ANSWER 2-hexene
Consider the properties of pentane and octane. Of the two, octane would have the - ANSWER
higher mass and higher boiling point
Consider the properties of octane and 2,3,4-trimethylpentane. Of the two, octane would have
the - ANSWER same mass and higher boiling point
Which alkane reactant would consume the most oxygen gas when undergoing complete
combustion? - ANSWER one mole of 2,3-dimethylhexane, one mole of
2,3,4-trimethylpentane, one mole of octane
Which is true of a pair of geometric stereoisomers?
,They have different .... - ANSWER physical properties
These molecules all contain eight carbon atoms. Which is not a structural isomer of the other
three? - ANSWER 3,3-dimethyl-1-hexyne
Which is the best description of molecules that are geometric stereoisomers? - ANSWER same
structure, but different spatial arrangement
Which is true of a pair of structural isomers? They have the same.... - ANSWER chemical
formula
Which of these structural isomers could not have cis and trans geometric stereoisomers? -
ANSWER 1,1-dichlorocyclopentane
Which correctly lists these compounds in order of increasing strength of inter-particle
attractive forces? - ANSWER CH2=CH2 < CH3F < KF
A student used a butyl substituent (i.e.,n-butyl, sec-butyl, tert-butyl, isobutyl) to name an
alkene. What is the correct IUPAC name for the molecule the student called n-butyl ethene? -
ANSWER 1-hexene
Which of these is not correct IUPAC nomenclature for an alkene? - ANSWER
1-methyl-1-butene
, A student draws an alkyne by drawing an ethyne, then attaching an alkyl substituent to each
of its two carbons. What is the IUPAC name of the alkyne created by adding ethyl and
sec-butyl groups to the carbons of ethyne? - ANSWER 5-methyl-3-heptyne
A student named a compound: 2-ethyl-3-methyl-2-butene. Although this represents the
connectivity of the molecule, it is not a valid IUPAC name. Which is the correct IUPAC name
for this compound? - ANSWER 2,3-dimethyl-2-pentene
A student draws an alkyne by drawing an ethyne, then attaching an alkyl substituent to each
of its two carbons. What is the IUPAC name of the alkyne created by adding methyl and
isobutyl groups to the carbons of ethyne? - ANSWER 5-methyl-2-hexyne
2-butanone can be converted to disec-butyl ether via a multi-step reaction sequence. Which is
the correct sequence of reagents/reaction conditions? - ANSWER H2 with Pt, then H2SO4 at
140oC
Two functional group reactions are performed in sequence.
Reaction #1: Dehydration of 1-butanol.
Reaction #2: Addition of HBr to the product of Reaction #1.
Which would be the major final product? - ANSWER 2-bromobutane
Which is the major product obtained from the dehydration of 2,3-dimethyl-3-pentanol? -
ANSWER 2,3-dimethyl-2-pentene
