Orgo Exam 1 - Multiple Choice

What is the ideal HCC bond angle for a molecule of CH2CH2?
a. 180°
b. 109.5°
c. 120°
d. 60°
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What is the ideal HCC bond angle for a molecule of CH2CH2?
a. 180°
b. 109.5°
c. 120°
d. 60°
c. 120°
While of the following correctly ranks the weakest to strongest acid?
a. HF, HCl, HBr
b. HCl, HBr, HF
c. HBr, HF, HCl
d. HBr, HCl, HF
e. HF, HBr, HCl
f. HCl, HF, HBr
a. HF, HCl, HBr
What is the hybridization of the oxygen in a hydroxyl (alcohol) group?
a. sp3
b. sp2
d. sp3d2
a. sp3
Which of the following statements about valence electrons is true?
a. They are the most tightly held electrons
b. They do not participate in chemical reactions.
c. They are the outermost electrons.
d. They reveal the period number of a second-row element.
c. They are the outermost electrons.
Which of the following statements about constitutional isomers is true?
a. Constitutional isomers are different molecules having different molecular formula.
b. Constitutional isomers are different molecules having same molecular formula.
c. Constitutional isomers are same molecules having different molecular formula.
d. Constitutional isomers are same molecules having the same molecular formula.
b. Constitutional isomers are different molecules having same molecular formula.
What is the molecular formula of a cycloalkane that has six carbon atoms?
a. C6H14
b. C6H10
c. C6H12
d. C6H14
c. C6H12
a. 4-Ethyl-5-methyloctane
What is the IUPAC name for the following compound?
a. 4-Ethyl-5-methyloctane
b. 4-Methyl-5-ethyloctane
c. 4-Methyl-3-propylheptane
d. 4-Methyl-5-propyloctane
Image: a. 4-Ethyl-5-methyloctane
Which of the following statements about electronegativity and the periodic table is true?
a. Electronegativity decreases across a row of the periodic table (L to R)
b. Electronegativity increases down a column of the periodic table
c. Electronegativity increases across a row of the periodic table (L to R)
d. Electronegativity does not change down a column of the periodic table
c. Electronegativity increases across a row of the periodic table (L to R)
Which of the following species is the conjugate acid of methanol, CH3OH?
a. CH3OH2+
b. CH3O-
c. CH3-
d. CH4
a. CH3OH2+
Which of the following compounds has the lowest pKa?
a. H2O
b. H2S
c. NH3
d. CH4
b. H2S
Which of the following concepts can be used to explain the difference in acidity between ethanol (CH3CH2OH) and 2-fluoroethanol (FCH2CH2OH)? a. Size b. Inductive effect c. Resonance d. Hybridizationb. Inductive effectWhy do heteroatoms confer reactivity on a particular molecule? a. Because they have lone pairs and create electron-rich sites on carbon b. Because they have lone pairs and create electron-deficient sites on carbon c. Because they are electronegative and act as electrophiles d. Because they are electropositive and act as nucleophilesb. Because they have lone pairs and create electron-deficient sites on carbonb. Amine, amide, aromatic, carboxylic acid, esterWhich of the following lists the correct functional groups found in aspartame, the artificial sweetener, shown to the right? a. Amine, aromatic, carboxylic acid, ether, ketone. b. Amine, amide, aromatic, carboxylic acid, ester c. Amide, alcohol, aromatic, carboxylic acid, ether. d. Amine, aromatic, carboxylic acid, ester, halide.b. 6How many pi bonds are present in a molecule of aspartame? a. 3 b. 6 c. 9 d. 12a. electrophilic because it is electron-deficient.The carbon atom, bonded to Br is,: a. electrophilic because it is electron-deficient. b. nucleophilic because it is electron-deficient. c. electrophilic because it is electron-rich. d. nucleophilic because it is electron-rich.What is the hybridization of the carbon atom in the methyl cation, (CH3+)? a. sp3 b. sp2 c. sp d. pb. sp2What is the CCC bond angle in the most stable conformer of cyclohexane? a. 60 b. 90 c. 109 d. 120c. 109What is the atomic number an atom of (79/35)Br a. 44 b. 79 c. 35 d. 114c. 35Which CC bond will absorb at a higher wavenumber in the IR spectrum? a. CH3CH2OCH3 b. CH2CHOCH3 c. CHCOCH3 d. C6H6c. CHCOCH3What is the CCC bond angle in the molecule CH3CHCHOH? a. 60 b. 90 c. 109 d. 120 e. 180d. 120Switching to a heavier isotope of carbon (from 12C vs 13C) would cause the carbonyl stretch of HCOH to absorb: a. At higher frequency. b. At lower frequency. c. No change. D. It cannot be predictedb. At lower frequency.Rank the intermolecular forces from weakest to strongest: a. van der Waals < H-Bonding < Ionic b. H-Bonding < dipole dipole< Ionic e. Ionic < H-bonding < dipole-dipole d. H-bonding < dipole dipole < ionic e. H-bonding < dipole dipole < van der Waala. van der Waals < H-Bonding < IonicA Lewis base is: a. An electron acceptor and a nucleophile b. An electron donor and a nucleophile c. An electron acceptor and an electrophiles d. An electron donor and an electrophileb. An electron donor and a nucleophileWhich, if any, of the following molecules have a NET dipole? a. CO2 b. NH3 c. HCCH d. Br2 e. none of them have a net dipoleb. NH3Which of the following species is not a Brønsted-Lowry base? a. CH3OH b. NH3 c. PO4 3- d.H2O e. BF3e. BF3