Question 1

Select the most electronegative element from the list below.

Accepted Answer

A) H 
B) O 
C) N 
D) B 
E) C 
A) H 
B) O 
C) N 
D) B 
E) C

Question 2

Which structure(s)contain(s)an oxygen that bears a formal charge of +1?

Accepted Answer

A) I and II 
B) III and IV 
C) V 
D) II 
E) I and V 
A) I and II 
B) III and IV 
C) V 
D) II 
E) I and V

Question 3

According to molecular orbital theory,which molecule could not exist?

Accepted Answer

A) H2 
B) He2 
C) Li2 
D) F2 
E) N2 
A) H2 
B) He2 
C) Li2 
D) F2 
E) N2

Question 4

Constitutional isomers differ in the ___.

Accepted Answer

connectivi

Question 5

How many electrons contribute to pi bonds in the following compound?

Accepted Answer

A) 0 
B) 3 
C) 6 
D) 7 
E) None of these choices. 
A) 0 
B) 3 
C) 6 
D) 7 
E) None of these choices.

Question 6

Which of the following compounds contain a sulfur atom that bears a +1 formal charge?

Accepted Answer

A) H2S 
B) SO2 
C) SF6 
D) MgSO4 
E) H2SO4 
A) H2S 
B) SO2 
C) SF6 
D) MgSO4 
E) H2SO4

Question 7

Which of the following is a set of constitutional isomers?

Accepted Answer

A) I and II 
B) II and III 
C) I,II,and III 
D) II,III,and IV 
E) I,III,and IV 
A) I and II 
B) II and III 
C) I,II,and III 
D) II,III,and IV 
E) I,III,and IV

Question 8

is a generalized structural representation which can be used for all of the following,except:

Accepted Answer

A) H2O 
B) H2Se 
C) H2S 
D) BeH2 
E) There is no exception. 
A) H2O 
B) H2Se 
C) H2S 
D) BeH2 
E) There is no exception.

Question 9

What is the formal charge on oxygen in the following structure?

Accepted Answer

A) +2 
B) +1 
C) 0 
D) -1 
E) -2 
A) +2 
B) +1 
C) 0 
D) -1 
E) -2

Question 10

Identify the atomic orbitals in the N-O sigma bond in the following oxime:

Accepted Answer

A) (2sp2,2sp2) 
B) (2sp3,2sp3) 
C) (2sp,2sp) 
D) (2sp2,2sp3) 
E) (2sp,1s) 
A) (2sp2,2sp2) 
B) (2sp3,2sp3) 
C) (2sp,2sp) 
D) (2sp2,2sp3) 
E) (2sp,1s)

Question 11

Which molecule would be linear? (In each case you should write a Lewis structure before deciding.)

Accepted Answer

A) SO2 
B) HCN 
C) H2O2 
D) H2S 
E) OF2 
A) SO2 
B) HCN 
C) H2O2 
D) H2S 
E) OF2

Question 12

Identify the atomic orbital the lone pair electrons on the O atom are contained in:

Accepted Answer

A) 2sp2 
B) 2sp3 
C) 2sp 
D) 2s 
E) 2p 
A) 2sp2 
B) 2sp3 
C) 2sp 
D) 2s 
E) 2p

Question 13

An orbital is defined as a region of space where the probability of ___ is high.

Accepted Answer

The answer of An orbital is defined as a region...

Question 14

When atomic orbitals of opposite phase overlap a(n)___ molecular orbital is formed.

Accepted Answer

The answer of When atomic orbitals of opposite phase overlap...

Question 15

The bond angle for the C-C-H bonds in CH3CN would be expected to be approximately:

Accepted Answer

A) 90S1U1P1$\circ$S1S1P0 
B) 109S1U1P1$\circ$S1S1P0 
C) 120S1U1P1$\circ$S1S1P0 
D) 145S1U1P1$\circ$S1S1P0 
E) 180S1U1P1$\circ$S1S1P0 
A) 90S1U1P1$\circ$S1S1P0 
B) 109S1U1P1$\circ$S1S1P0 
C) 120S1U1P1$\circ$S1S1P0 
D) 145S1U1P1$\circ$S1S1P0 
E) 180S1U1P1$\circ$S1S1P0

Question 16

When the 1s orbitals of two hydrogen atoms combine to form a hydrogen molecule,how are the electrons distributed in the resulting molecular orbitals?

Accepted Answer

A) Two electrons in the bonding molecular orbital. 
B) One electron in the bonding molecular orbital,one electron in the non-bonding molecular orbital. 
C) One electron in the bonding molecular orbital,one electron in the antibonding molecular orbital. 
D) Two electrons in the non-bonding molecular orbital. 
E) Two electrons in the antibonding molecular orbital. 
A) Two electrons in the bonding molecular orbital. 
B) One electron in the bonding molecular orbital,one electron in the non-bonding molecular orbital. 
C) One electron in the bonding molecular orbital,one electron in the antibonding molecular orbital. 
D) Two electrons in the non-bonding molecular orbital. 
E) Two electrons in the antibonding molecular orbital.

Question 17

What would be the spatial arrangement (shape)of the atoms of the methyl anion :CH3-?

Accepted Answer

A) octahedral 
B) tetrahedral 
C) trigonal planar 
D) linear 
E) trigonal pyramidal 
A) octahedral 
B) tetrahedral 
C) trigonal planar 
D) linear 
E) trigonal pyramidal

Question 18

Determine the bond angles (I - IV)on the following structure based according to the VSEPR theory.

Accepted Answer

I = 109.5^o,

Exam 1: The Basics

Select the most electronegative element from the list below.

Which structure(s)contain(s)an oxygen that bears a formal charge of +1?

According to molecular orbital theory,which molecule could not exist?

Constitutional isomers differ in the ___.

How many electrons contribute to pi bonds in the following compound?

Which of the following compounds contain a sulfur atom that bears a +1 formal charge?

Which of the following is a set of constitutional isomers?

is a generalized structural representation which can be used for all of the following,except:

What is the formal charge on oxygen in the following structure?

Identify the atomic orbitals in the N-O sigma bond in the following oxime:

Which molecule would be linear? (In each case you should write a Lewis structure before deciding.)

Identify the atomic orbital the lone pair electrons on the O atom are contained in:

An orbital is defined as a region of space where the probability of ___ is high.

When atomic orbitals of opposite phase overlap a(n)___ molecular orbital is formed.

The bond angle for the C-C-H bonds in CH3CN would be expected to be approximately:

When the 1s orbitals of two hydrogen atoms combine to form a hydrogen molecule,how are the electrons distributed in the resulting molecular orbitals?

What would be the spatial arrangement (shape)of the atoms of the methyl anion :CH3-?

Determine the bond angles (I - IV)on the following structure based according to the VSEPR theory.

Families of Carbon

Acids and Bases

Nomenclature and Conformations of Alkanes and Cycloalkanes

Stereochemistry

Nucleophilic Reactions

Alkenes and Alkynes I

Alkenes and Alkynes II

Nuclear Magnetic Resonance and Mass Spectrometry

Radical Reactions

Alcohols and Ethers

Alcohols From Carbonyl Compounds

Conjugated Unsaturated Systems

Aromatic Compounds

Reactions of Aromatic Compounds

Aldehydes and Ketones

Carboxylic Acids and Their Derivatives

Reactions at the Α Carbon of Carbonyl Compounds

Condensation and Conjugate Addition Reactions of Carbonyl Compounds

Amines

Transition Metal Complexes

Carbohydrates

Lipids

Amino Acids and Proteins

Nucleic Acids and Protein Synthesis

Filters

The bond angle for the C-C-H bonds in CH₃CN would be expected to be approximately:

What would be the spatial arrangement (shape)of the atoms of the methyl anion :CH₃^-?