CHEM 105 EXAM 3 ALL ROUND PRACTISE
QUESTIONS TO BE EXPECTED
Which bonding pattern is NOT typical of carbon atoms in organic compounds? -
ANSWER: star looking C
Which alkyl group is a secondary alkyl group? - ANSWER: CH3CH2CH^CH3
Which statement concerning the two compounds shown below is FALSE? - ANSWER:
Compound A and compound B are both hydrocarbons.
Consider the compound 4-ethyl-2,2-dimethylhexane, shown below. What
classification best describes the fourth carbon atom in this six-carbon parent chain? -
ANSWER: tertiary
Which of the following best describes molecules related as conformational isomers?
- ANSWER: same molecular formulas, the same connections between atoms, but
different spatial arrangement of atoms due to rotation around bonds
How does an alkyl group differ from its parent alkane? - ANSWER: An alkyl group
contains one less hydrogen atom than its parent alkane.
What are the bond angles in ethene? - ANSWER: 120 DEGREES
Name the following compound using the IUPAC Nomenclature System:
CH3CH2CHCHCH2C≡CH | | Br Br - ANSWER: Name: 4,5−Dibromo−1−heptyne
CH3CH2CH=CHCHCH2CH3-Br - ANSWER: 5-bromo-3-heptene
1−Bromo−3−hexyne - ANSWER:
https://ezto.mheducation.com/wwtb//html_denniston_gob_10e_c2020/chap11/
sect2/prob17/epn29107.gif
Be sure to answer all parts.Arrange the following groups of molecules from the
highest to lowest boiling points
:a. ethynepropyne 2−pentyne b. 2−butene 3−deceneethene - ANSWER: (a)
2−pentyne > propyne > ethyne
(b) 3−decene > 2−butene > ethene
CH
≡
CCH2C
≡
CH name the IUPAC - ANSWER: Name: 1,4−Pentadiyne
, What class of compounds is represented by the general formula ROR? - ANSWER:
ethers
Classify the alcohol shown below.
H3C-C-CH2CH3^CH3 DOWN OH - ANSWER: TERTIARY
What class of compounds is represented by the general formula RSH? - ANSWER:
thiols
What is the name of the alcohol produced by the fermentation of sugars and
starches, and contained in alcoholic beverages? - ANSWER: ethanol
What is the name of the product formed in the following reaction, the catalyzed
hydrogenation of butanone? - ANSWER: 2-butanol
What is the most common use of phenol derivatives in health care? - ANSWER:
antiseptics/disinfectants
What class of compounds is represented by the general formula RCHO? - ANSWER:
aldehydes
What type of compound is formed in the following reaction?
R-C-O-R-^OH-DOWN R +ROH H+ - ANSWER: acetal
Which statement best describes the structural difference between aldehydes and
ketones? - ANSWER: Aldehydes contain a carbonyl group on an end carbon of the
carbon chain; ketones contain a carbonyl group on a carbon within the carbon chain.
What is the structure of ethyl isopropyl ketone? - ANSWER: CH3CH-C-CH2CH3-
^CH3=O
Which of the following is the enol tautomer of the keto form shown? - ANSWER:
CH3-CH2-CH=C-H^-OH
Acetone is the simplest ketone. Not only is it used industrially as a solvent, but it is
also produced by the body as a product of lipid metabolism. What is the structure of
acetone? - ANSWER: CH3-C-CH3^=O
Which of the following compounds would have the greatest solubility in water? -
ANSWER: Na+....(THE REST OF THE EQUATION) ITS THE ONLY ONE WITH Na+
Hydrolysis of an ester produced the two organic products shown. What is the
structure of the original ester? - ANSWER: CH3-C-OCH2CH2CH3^=O
What is the name of the spherical particles formed in solution when specks of oil or
grease are surrounded by soap molecules? - ANSWER: micelles
QUESTIONS TO BE EXPECTED
Which bonding pattern is NOT typical of carbon atoms in organic compounds? -
ANSWER: star looking C
Which alkyl group is a secondary alkyl group? - ANSWER: CH3CH2CH^CH3
Which statement concerning the two compounds shown below is FALSE? - ANSWER:
Compound A and compound B are both hydrocarbons.
Consider the compound 4-ethyl-2,2-dimethylhexane, shown below. What
classification best describes the fourth carbon atom in this six-carbon parent chain? -
ANSWER: tertiary
Which of the following best describes molecules related as conformational isomers?
- ANSWER: same molecular formulas, the same connections between atoms, but
different spatial arrangement of atoms due to rotation around bonds
How does an alkyl group differ from its parent alkane? - ANSWER: An alkyl group
contains one less hydrogen atom than its parent alkane.
What are the bond angles in ethene? - ANSWER: 120 DEGREES
Name the following compound using the IUPAC Nomenclature System:
CH3CH2CHCHCH2C≡CH | | Br Br - ANSWER: Name: 4,5−Dibromo−1−heptyne
CH3CH2CH=CHCHCH2CH3-Br - ANSWER: 5-bromo-3-heptene
1−Bromo−3−hexyne - ANSWER:
https://ezto.mheducation.com/wwtb//html_denniston_gob_10e_c2020/chap11/
sect2/prob17/epn29107.gif
Be sure to answer all parts.Arrange the following groups of molecules from the
highest to lowest boiling points
:a. ethynepropyne 2−pentyne b. 2−butene 3−deceneethene - ANSWER: (a)
2−pentyne > propyne > ethyne
(b) 3−decene > 2−butene > ethene
CH
≡
CCH2C
≡
CH name the IUPAC - ANSWER: Name: 1,4−Pentadiyne
, What class of compounds is represented by the general formula ROR? - ANSWER:
ethers
Classify the alcohol shown below.
H3C-C-CH2CH3^CH3 DOWN OH - ANSWER: TERTIARY
What class of compounds is represented by the general formula RSH? - ANSWER:
thiols
What is the name of the alcohol produced by the fermentation of sugars and
starches, and contained in alcoholic beverages? - ANSWER: ethanol
What is the name of the product formed in the following reaction, the catalyzed
hydrogenation of butanone? - ANSWER: 2-butanol
What is the most common use of phenol derivatives in health care? - ANSWER:
antiseptics/disinfectants
What class of compounds is represented by the general formula RCHO? - ANSWER:
aldehydes
What type of compound is formed in the following reaction?
R-C-O-R-^OH-DOWN R +ROH H+ - ANSWER: acetal
Which statement best describes the structural difference between aldehydes and
ketones? - ANSWER: Aldehydes contain a carbonyl group on an end carbon of the
carbon chain; ketones contain a carbonyl group on a carbon within the carbon chain.
What is the structure of ethyl isopropyl ketone? - ANSWER: CH3CH-C-CH2CH3-
^CH3=O
Which of the following is the enol tautomer of the keto form shown? - ANSWER:
CH3-CH2-CH=C-H^-OH
Acetone is the simplest ketone. Not only is it used industrially as a solvent, but it is
also produced by the body as a product of lipid metabolism. What is the structure of
acetone? - ANSWER: CH3-C-CH3^=O
Which of the following compounds would have the greatest solubility in water? -
ANSWER: Na+....(THE REST OF THE EQUATION) ITS THE ONLY ONE WITH Na+
Hydrolysis of an ester produced the two organic products shown. What is the
structure of the original ester? - ANSWER: CH3-C-OCH2CH2CH3^=O
What is the name of the spherical particles formed in solution when specks of oil or
grease are surrounded by soap molecules? - ANSWER: micelles
