Question 1

What is the hybridization for each of the indicated atoms in the following compound?

Accepted Answer

A)  I = sp2; II = sp2; III = sp2. 
B)  I = sp2; II = sp3; III = sp3. 
C)  I = sp; II = sp2; III = sp3. 
D)  I = sp2; II = sp2; III = sp3. 
A)  I = sp2; II = sp2; III = sp2. 
B)  I = sp2; II = sp3; III = sp3. 
C)  I = sp; II = sp2; III = sp3. 
D)  I = sp2; II = sp2; III = sp3. D

Question 2

What is the approximate value of the H-C-H bond angle in methane, CH4?

Accepted Answer

A)  90° 
B)  109.5° 
C)  120° 
D)  180° 
A)  90° 
B)  109.5° 
C)  120° 
D)  180° B

Question 3

What is the ground-state electronic configuration of a magnesium cation (Mg2+)?

Accepted Answer

A)  1s2, 2s2, 2p6 
B)  1s2, 2s2, 2p6, 3s1 
C)  1s2, 2s2, 2p6, 3s2 
D)  1s2, 2s2, 2p6, 3s2, 3p2 
A)  1s2, 2s2, 2p6 
B)  1s2, 2s2, 2p6, 3s1 
C)  1s2, 2s2, 2p6, 3s2 
D)  1s2, 2s2, 2p6, 3s2, 3p2 A

Question 4

Which of the following molecules has nonpolar covalent bonds?

Accepted Answer

A)  HCl 
B)  N2 
C)  CHCl3 
D)  NO 
A)  HCl 
B)  N2 
C)  CHCl3 
D)  NO

Question 5

Which of the following statements about constitutional isomers is true?

Accepted Answer

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. 
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.

Question 6

What is the hybridization of the carbon atom in the methyl cation, (CH3+)?

Accepted Answer

A)  sp3 
B)  sp2 
C)  sp 
D)  p 
A)  sp3 
B)  sp2 
C)  sp 
D)  p

Question 7

Avobenzone is an active ingredient in some common sunscreens. Which of the following is the correct molecular formula for avobenzone?

Accepted Answer

A)  C22O22O3 
B)  C20H22O3 
C)  C21H23O3 
D)  C20H24O3 
A)  C22O22O3 
B)  C20H22O3 
C)  C21H23O3 
D)  C20H24O3

Question 8

How many constitutional isomers are there for a molecule having the molecular C3H8O?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
A)  1 
B)  2 
C)  3 
D)  4

Question 9

Follow the curved arrows to draw the second resonance structure for the ion below.

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
A)  I 
B)  II 
C)  III 
D)  IV

Question 10

Which of the following statements about electronegativity and the periodic table is true?

Accepted Answer

A)  Electronegativity decreases across a row of the periodic table. 
B)  Electronegativity increases down a column of the periodic table. 
C)  Electronegativity increases across a row of the periodic table. 
D)  Electronegativity does not change down a column of the periodic table. 
A)  Electronegativity decreases across a row of the periodic table. 
B)  Electronegativity increases down a column of the periodic table. 
C)  Electronegativity increases across a row of the periodic table. 
D)  Electronegativity does not change down a column of the periodic table.

Question 11

How many different isomers are there for a compound having the molecular formula C3H6O?

Accepted Answer

A)  4 
B)  5 
C)  6 
D)  7 
A)  4 
B)  5 
C)  6 
D)  7

Question 12

What is the order of decreasing bond length for a C-C bond comprised of the following molecular orbitals? $$\begin{array} { c c c } 
s p ^ { 3 } - s p ^ { 3 } & s p ^ { 2 } - s p ^ { 2 } & s p - s p \
\text { I } & \text { II } & \text { III }
\end{array}$$

Accepted Answer

A)  I > III > II 
B)  I > II > III 
C)  III > II > I 
D)  II > III > I 
A)  I > III > II 
B)  I > II > III 
C)  III > II > I 
D)  II > III > I

Question 13

In which of the following ions does carbon have a formal charge? $\left[ \left( \mathrm { CH } _ { 3 } \right) _ { 4 } \mathrm {~N} \right] ^ { + }\quad$$\left[ \mathrm { CH } _ { 3 } \mathrm { CO } _ { 2 } \right] ^ { - }\quad$$\left[ \mathrm { CH } _ { 3 } \mathrm { OH } _ { 2 } \right] ^ { + }$
$\quad$I$\quad\quad\quad\quad\quad\quad\quad\quad$II$\quad\quad\quad\quad\quad$III

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  None of the above 
A)  I 
B)  II 
C)  III 
D)  None of the above

Question 14

In which of the following ions does carbon have a formal charge? $\mathrm { CH } _ { 3 } \mathrm { OH }\quad$$\mathrm { NaCH } _ { 3 }\quad$$\mathrm { CH } _ { 3 } \mathrm { CO } _ { 2 } -$
I$\quad\quad\quad\quad\quad$II$\quad\quad\quad\quad$III

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  None of the above 
A)  I 
B)  II 
C)  III 
D)  None of the above

Question 15

Which of the following covalent bonds has the largest dipole moment?

Accepted Answer

A)  C-H 
B)  C-C 
C)  C-O 
D)  H-F 
A)  C-H 
B)  C-C 
C)  C-O 
D)  H-F

Question 16

Which atomic orbitals overlap to form the C-H F1F1F1S1F1F1F10 bonding molecular orbitals of ethane, CH3CH3?

Accepted Answer

A)  Csp2 + H1s 
B)  Csp3 + H1s 
C)  C2p + H1s 
D)  Csp + H1s 
A)  Csp2 + H1s 
B)  Csp3 + H1s 
C)  C2p + H1s 
D)  Csp + H1s

Question 17

Which atomic orbitals overlap to form the C-H F1F1F1S1F1F1F10 bonding molecular orbitals of ethylene, H2C=CH2?

Accepted Answer

A)  C2p + H1s 
B)  Csp + H1s 
C)  Csp3 + H1s 
D)  Csp2 + H1s 
A)  C2p + H1s 
B)  Csp + H1s 
C)  Csp3 + H1s 
D)  Csp2 + H1s

Question 18

Which of the following pair does not represent resonance structures?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
A)  I 
B)  II 
C)  III 
D)  IV

Question 19

What is the approximate C-C-C bond angle in propene, CH3CH=CH2?

Accepted Answer

A)  90° 
B)  109.5° 
C)  120° 
D)  180° 
A)  90° 
B)  109.5° 
C)  120° 
D)  180°

Question 20

Which of the following compounds has an atom with an unfilled valence shell of electrons?

Accepted Answer

A)  H2O 
B)  BCl3 
C)  CH4 
D)  CO2 
A)  H2O 
B)  BCl3 
C)  CH4 
D)  CO2

Exam 1: Structure and Bonding

What is the hybridization for each of the indicated atoms in the following compound?

What is the approximate value of the H-C-H bond angle in methane, CH4?

What is the ground-state electronic configuration of a magnesium cation (Mg2+)?

Which of the following molecules has nonpolar covalent bonds?

Which of the following statements about constitutional isomers is true?

What is the hybridization of the carbon atom in the methyl cation, (CH3+)?

Avobenzone is an active ingredient in some common sunscreens. Which of the following is the correct molecular formula for avobenzone?

How many constitutional isomers are there for a molecule having the molecular C3H8O?

Follow the curved arrows to draw the second resonance structure for the ion below.

Which of the following statements about electronegativity and the periodic table is true?

How many different isomers are there for a compound having the molecular formula C3H6O?

What is the order of decreasing bond length for a C-C bond comprised of the following molecular orbitals? s-s s-s sp-sp I II III

In which of the following ions does carbon have a formal charge? CH3OH\mathrm { CH } _ { 3 } \mathrm { OH }\quadCH3​OHNaCH3\mathrm { NaCH } _ { 3 }\quadNaCH3​CH3CO2−\mathrm { CH } _ { 3 } \mathrm { CO } _ { 2 } -CH3​CO2​− I \quad\quad\quad\quad\quad II \quad\quad\quad\quad III

Which of the following covalent bonds has the largest dipole moment?

Which atomic orbitals overlap to form the C-H  bonding molecular orbitals of ethane, CH3CH3?

Which atomic orbitals overlap to form the C-H  bonding molecular orbitals of ethylene, H2C=CH2?

Which of the following pair does not represent resonance structures?

What is the approximate C-C-C bond angle in propene, CH3CH=CH2?

Which of the following compounds has an atom with an unfilled valence shell of electrons?

Acids and Bases

Introduction to Organic Molecules and Functional Groups

Alkanes

Stereochemistry

Understanding Organic Reactions

Alkyl Halides and Nucleophilic Substitution

Alkyl Halides and Elimination Reactions

Alcohols, Ethers and Epoxides

Alkenes

Alkynes

Oxidation and Reduction

Mass Spectrometry and Infrared Spectroscopy

Nuclear Magnetic Resonance Spectroscopy

Radical Reactions

Conjugation, Resonance, and Dienes

Benzene and Aromatic Compounds

Electrophilic Aromatic Substitution

Carboxylic Acids and the Acidity of the O-H Bond

Introduction to Carbonyl Chemistry; Organometallic Reagents; Oxidation and Reduction

Aldehydes and Ketones Nucleophilic Addition

Carboxylic Acids and Derivatives

Substitution Reactions of Carbonyl Compounds at the Alpha-Carbon

Carbonyl Condensation Reactions

Amines

Carbon-Carbon Bond Forming Reactions in Organic Synthesis

Pericyclic Reactions

Carbohydrates

Amino Acids and Proteins

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Filters

What is the approximate value of the H-C-H bond angle in methane, CH₄?

What is the ground-state electronic configuration of a magnesium cation (Mg²⁺)?

What is the hybridization of the carbon atom in the methyl cation, (CH₃⁺)?

How many constitutional isomers are there for a molecule having the molecular C₃H₈O?

How many different isomers are there for a compound having the molecular formula C₃H₆O?

In which of the following ions does carbon have a formal charge? $\mathrm { CH } _ { 3 } \mathrm { OH }\quad$ $\mathrm { NaCH } _ { 3 }\quad$ $\mathrm { CH } _ { 3 } \mathrm { CO } _ { 2 } -$ I $\quad\quad\quad\quad\quad$ II $\quad\quad\quad\quad$ III

Which atomic orbitals overlap to form the C-H  bonding molecular orbitals of ethane, CH₃CH₃?

Which atomic orbitals overlap to form the C-H  bonding molecular orbitals of ethylene, H₂C=CH₂?

What is the approximate C-C-C bond angle in propene, CH₃CH=CH₂?