Question 1

How many degrees of unsaturation are present in a compound with the molecular formula $$\mathrm{C_8H_{14}}$$?

Accepted Answer

$$2$$

Question 2

Which of the following statements about (E)-3-methyl-2-pentene and (Z)-3-methyl-2-pentene is correct?

Accepted Answer

They are diastereomers.

Question 3

What is the IUPAC name for a compound with the following structure: a six-membered ring with two methyl groups at positions 1 and 3, and double bonds at positions 1 and 3?

Accepted Answer

1,3-dimethyl-1,3-cyclohexadiene

Question 4

Which of the following best describes the effect of a catalyst on a chemical reaction?

Accepted Answer

It increases the reaction rate by lowering the activation energy.

Question 5

If the R enantiomer of a compound has a specific rotation of $$+17.5$$, what is the specific rotation of the S enantiomer?

Accepted Answer

$$-17.5$$

Question 6

A mixture of R and S enantiomers has an observed rotation of $$+3.6. $$What is the enantiomeric excess (%ee) of the mixture if the pure R enantiomer has a specific rotation of $$+17.5$$?

Accepted Answer

$$20.6\%$$

Question 7

Which of the following best describes the relationship between two molecules that are non-superimposable mirror images of each other?

Accepted Answer

Enantiomers

Question 8

Which of the following statements about reaction coordinate diagrams is correct?

Accepted Answer

The difference in energy between reactants and products is $$\Delta G^\circ.$$

Question 9

Which of the following is true about the Newman projection of ethane in its most stable conformation?

Accepted Answer

All hydrogens are staggered.

Question 10

Which of the following is a possible structure for a compound that, upon ozonolysis, yields equal amounts of three different carbonyl-containing products?

Accepted Answer

A trisubstituted alkene with three different alkyl groups attached to the double bond.

Question 11

Which of the following best describes the relationship between (R,R)-2,3-dibromobutane and (S,S)-2,3-dibromobutane?

Accepted Answer

They are enantiomers.

Question 12

How many stereocenters are present in a molecule of 2,3-dibromobutane?

Accepted Answer

$$2$$

Question 13

Which of the following is true regarding the effect of temperature on reaction rate?

Accepted Answer

Increasing temperature increases the reaction rate by providing more molecules with enough energy to overcome the activation barrier.

Question 14

Which of the following is the correct formula for calculating degrees of unsaturation for a hydrocarbon with the formula $$\mathrm{C_nH_m}$$?

Accepted Answer

$$\frac{2n+2-m}{2}$$

Question 15

Which of the following best describes a pair of molecules that have the same molecular formula but different connectivity?

Accepted Answer

Constitutional isomers

Question 16

A mixture contains $$39.7\% R $$enantiomer and $$60.3\% S $$enantiomer. What is the enantiomeric excess (%ee) of the mixture?

Accepted Answer

$$20.6\%$$

Question 17

Which of the following is true about the E/Z nomenclature for alkenes?

Accepted Answer

Z isomers have the higher priority groups on the same side of the double bond.

Question 18

Which of the following is the correct relationship between the activation energy ($$E_a) $$and the rate constant ($$k) of a $$reaction, according to the Arrhenius equation?

Accepted Answer

$$k$$ decreases as $$E_a$$ increases.

Question 19

Which of the following is a correct statement about the arrow-pushing mechanism in organic reactions?

Accepted Answer

Arrows start from lone pairs or bonds and point toward atoms that accept electrons.

Organic Chemistry Worksheet #2 – Reaction Coordinate Diagrams and Mechanisms

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