Question 1

Which of the following contributes to make ΔG° more negative?

Accepted Answer

A) use of a catalyst 
B) a more positive ΔH° 
C) a more positive ΔS° 
D) a larger rate constant 
E) none of the above 
A) use of a catalyst 
B) a more positive ΔH° 
C) a more positive ΔS° 
D) a larger rate constant 
E) none of the above C

Question 2

Consider the reaction coordinate diagram shown. Which step has the greatest rate constant in the forward direction?

Accepted Answer

Step 3 (E going to G)

Question 3

Which of the following is an allylic alcohol?

Accepted Answer

A) CH2=CHCH2OCH3 
B) CH2=CHCH2CH3 
C) HOCH=CHCH2CH3 
D) CH3CH=CHCH2OH 
E) CH2=CHCH2CH2OH 
A) CH2=CHCH2OCH3 
B) CH2=CHCH2CH3 
C) HOCH=CHCH2CH3 
D) CH3CH=CHCH2OH 
E) CH2=CHCH2CH2OH D

Question 4

Name the structure.

Accepted Answer

A) cis-3-ethyl-4-hydroxymethyl-hex-3-en-1-yne 
B) cis-2,3-diethylpent-2-en-4-yn-1-ol 
C) trans-2,3-diethylpent-2-en-4-yn-1-ol 
D) cis-3,4-diethylpent-3-en-1-yn-5-ol 
E) trans-3,4-diethylpent-3-en-1-yn-5-ol 
A) cis-3-ethyl-4-hydroxymethyl-hex-3-en-1-yne 
B) cis-2,3-diethylpent-2-en-4-yn-1-ol 
C) trans-2,3-diethylpent-2-en-4-yn-1-ol 
D) cis-3,4-diethylpent-3-en-1-yn-5-ol 
E) trans-3,4-diethylpent-3-en-1-yn-5-ol

Question 5

Which of the following correctly describes intermediates and/or transition states?

Accepted Answer

A) Transition states occur at minima on reaction coordinate diagrams. 
B) Both transition states and intermediates occur at maxima on reaction coordinate diagrams. 
C) An intermediate is always produced after the rate-determining step of a reaction mechanism. 
D) Transition states have partially formed bonds whereas intermediates have fully formed bonds. 
E) none of the above 
A) Transition states occur at minima on reaction coordinate diagrams. 
B) Both transition states and intermediates occur at maxima on reaction coordinate diagrams. 
C) An intermediate is always produced after the rate-determining step of a reaction mechanism. 
D) Transition states have partially formed bonds whereas intermediates have fully formed bonds. 
E) none of the above

Question 6

Which of the following statements about ethene, C2H4, is incorrect?

Accepted Answer

A) The H-C-H bond angles are approximately 109.5°. 
B) All of the hydrogen atoms are in the same plane. 
C) There is a total of five sigma bonds. 
D) The carbon atoms are sp2 hybridized. 
E) The H-C-H bond angles are approximately 120°. 
A) The H-C-H bond angles are approximately 109.5°. 
B) All of the hydrogen atoms are in the same plane. 
C) There is a total of five sigma bonds. 
D) The carbon atoms are sp2 hybridized. 
E) The H-C-H bond angles are approximately 120°.

Question 7

Consider the conversion of C to D via a one-step mechanism. The activation energy of this conversion is 3 kcal/mol. The energy difference between D and the transition state of the reaction is 7 kcal/mol. Estimate ΔH° for the reaction C → D.

Accepted Answer

The answer of Consider the conversion of C to D...

Question 8

Under what conditions is ΔG° equal to ΔH° for a chemical reaction?

Accepted Answer

Since ΔG° = ΔH° - TΔ

Question 9

The Arrhenius equation models how the rate constant k ________.

Accepted Answer

A) increases as both Ea and T increase 
B) increases most when Ea increases and T decreases 
C) increases most when Ea decreases and T increases 
D) increases as both Ea and T decrease 
E) increases as reactant concentrations increase 
A) increases as both Ea and T increase 
B) increases most when Ea increases and T decreases 
C) increases most when Ea decreases and T increases 
D) increases as both Ea and T decrease 
E) increases as reactant concentrations increase

Question 10

Provide an acceptable name for the following compound.

Accepted Answer

2-ethyl-5,5-dimethyl

Question 11

Which of the following correctly describes the reaction whose reaction coordinate diagram is shown?

Accepted Answer

A) endergonic with no transition state 
B) exergonic with no transition state 
C) endergonic with a transition state 
D) exergonic with a transition state 
E) endergonic with an intermediate 
A) endergonic with no transition state 
B) exergonic with no transition state 
C) endergonic with a transition state 
D) exergonic with a transition state 
E) endergonic with an intermediate

Question 12

An increase in which of the following results in a decrease in the rate of the chemical reaction?

Accepted Answer

A) temperature 
B) concentration 
C) collision frequency 
D) energy of activation 
E) fraction of collisions with proper orientation 
A) temperature 
B) concentration 
C) collision frequency 
D) energy of activation 
E) fraction of collisions with proper orientation

Question 13

Provide the proper IUPAC name for the alkene shown below.

Accepted Answer

6-bromo-1-

Question 14

Name the structure.

Accepted Answer

A) 7-chloro-3-ethyl-4-methyl-3-heptene 
B) 1-chloro-5-ethyl-4-methyl-3-heptene 
C) 1-chloro-3-pentenyl-2-pentene 
D) cis-7-chloro-3-ethyl-4-methyl-3-heptene 
E) trans-7-chloro-3-ethyl-4-methyl-3-heptene 
A) 7-chloro-3-ethyl-4-methyl-3-heptene 
B) 1-chloro-5-ethyl-4-methyl-3-heptene 
C) 1-chloro-3-pentenyl-2-pentene 
D) cis-7-chloro-3-ethyl-4-methyl-3-heptene 
E) trans-7-chloro-3-ethyl-4-methyl-3-heptene

Question 15

Assign the E or Z configurational label to the following molecule:

Accepted Answer

The molecule has a Z configura

Question 16

Name the structure.

Accepted Answer

A) 2-methyl-2,4-pentadiene 
B) 4-methyl-1,4-pentadiene 
C) 2-methylene-4-pentene 
D) 4-methylene-2-pentene 
E) 2-methyl-1,4-pentadiene 
A) 2-methyl-2,4-pentadiene 
B) 4-methyl-1,4-pentadiene 
C) 2-methylene-4-pentene 
D) 4-methylene-2-pentene 
E) 2-methyl-1,4-pentadiene

Question 17

Why do reactions tend to proceed at a faster rate as T increases?

Accepted Answer

The number of molecular collis

Question 18

An increase in which of the following will occur if the reaction temperature is increased? I. Energy of activation
II) Collision frequency
III) Fraction of collisions with sufficient energy

Accepted Answer

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

Question 19

Provide the systematic name of the compound shown below. Make sure to include the E or Z designator if necessary.

Accepted Answer

(E)-4-ethy

Question 20

What is the molecular formula of the hydrocarbon that contains 8 carbon atoms, one ring, and two π bonds?

Accepted Answer

The answer of What is the molecular formula of the...

Exam 5: Alkenes Thermodynamics and Kinetics

Which of the following contributes to make ΔG° more negative?

Consider the reaction coordinate diagram shown. Which step has the greatest rate constant in the forward direction?

Which of the following is an allylic alcohol?

Name the structure.

Which of the following correctly describes intermediates and/or transition states?

Which of the following statements about ethene, C2H4, is incorrect?

Consider the conversion of C to D via a one-step mechanism. The activation energy of this conversion is 3 kcal/mol. The energy difference between D and the transition state of the reaction is 7 kcal/mol. Estimate ΔH° for the reaction C → D.

Under what conditions is ΔG° equal to ΔH° for a chemical reaction?

The Arrhenius equation models how the rate constant k ________.

Provide an acceptable name for the following compound.

Which of the following correctly describes the reaction whose reaction coordinate diagram is shown?

An increase in which of the following results in a decrease in the rate of the chemical reaction?

Provide the proper IUPAC name for the alkene shown below.

Name the structure.

Assign the E or Z configurational label to the following molecule:

Name the structure.

Why do reactions tend to proceed at a faster rate as T increases?

An increase in which of the following will occur if the reaction temperature is increased? I. Energy of activation II) Collision frequency III) Fraction of collisions with sufficient energy

Provide the systematic name of the compound shown below. Make sure to include the E or Z designator if necessary.

What is the molecular formula of the hydrocarbon that contains 8 carbon atoms, one ring, and two π bonds?

Remembering General Chemistry: Electronic Structure and Bonding

Acids and Bases: Central to Understanding Organic Chemistry

An Introduction to Organic Compounds

Isomers: the Arrangement of Atoms in Space

Reactions of Alkenes

Reactions of Alkynes Introduction to Multistep Synthesis

Electron Delocalization, Resonance, and Aromaticity More About Molecular Orbital Theory

Substitution Reactions of Alkyl Halides

Elimination Reactions of Alkyl Halides Competition Between Substitution and Elimination

Reactions of Alcohols, Ethers, Epoxides, and Sulfur-Containing Compounds

Organometallic Compounds

Reactions of Alkanes, Radicals

Mass Spectrometry, Infrared Spectroscopy, and Uvvis Spectroscopy

Nmr Spectroscopy

Reactions of Carboxylic Acids and Carboxylic Acid Derivatives

Reactions of Aldehydes and Ketones

Reactions at the Alpha Carbon of Carbonyl Compounds

Reactions of Benzene and Substituted Benzenes

More About Amines Heterocylic Compounds

Carbohydrates

Amino Acids, Peptides, and Proteins

Catalysis

The Organic Mechanisms of the Coenzymes

The Chemistry of Metabolism

Nucleosides, Nucleotides, and Nucleic Acids

Synthetic Polymers

Pericyclic Reactions

Filters

Which of the following statements about ethene, C₂H₄, is incorrect?