Question 1

Which type of chemical bond is targeted during a hydrogenation reaction?

Accepted Answer

Double or triple (pi) bond

Question 2

In the hydrogenation of an alkene, how many hydrogen atoms are added to the molecule?

Accepted Answer

Two

Question 3

What is the role of a catalyst in a hydrogenation reaction?

Accepted Answer

It helps break the H-H bond in hydrogen gas.

Question 4

Given the following reaction: $$ \mathrm{C_6H_{10}} + H_2$ \xrightarrow{	ext{catalyst}} \mathrm{C_6H_{12}} $$, what type of organic compound is the product?

Accepted Answer

Alkane

Question 5

Which of the following best describes the change in saturation during a hydrogenation reaction?

Accepted Answer

The molecule becomes more saturated.

Question 6

A chemist hydrogenates 2-butyne ($$ \mathrm{CH_3C \equiv $$CCH_3$$} ) $$using excess $$ H_2$ $$ and a catalyst. What is the major product?

Accepted Answer

Butane

Question 7

Why is a catalyst necessary for hydrogenation reactions involving $$ H_2$ $$?

Accepted Answer

Because the $$ H-H $$ bond is very stable and difficult to break.

Question 8

Which of the following is a common catalyst used in hydrogenation reactions?

Accepted Answer

Platinum (Pt)

Question 9

During the hydrogenation of an alkyne, how many moles of $$ H_2$ $$ are required to fully convert one mole of alkyne to an alkane?

Accepted Answer

Two

Question 10

A student performs a hydrogenation reaction on cyclohexene ($$ \mathrm{C_6H_{10}} ) $$with $$ H_2$ $$ and a catalyst. What is the IUPAC name of the product?

Accepted Answer

Cyclohexane

Question 11

Which statement best describes the change in molecular geometry when an alkene is hydrogenated?

Accepted Answer

The molecule changes from planar to tetrahedral geometry.

Question 12

If you hydrogenate 1-hexene ($$ \mathrm{CH_2$=CH(CH_2$)_3CH_3} $$), what is the product?

Accepted Answer

Hexane

Question 13

Which of the following is NOT a result of hydrogenation of an organic compound?

Accepted Answer

Formation of a double bond

Question 14

A food scientist hydrogenates vegetable oil to produce margarine. What chemical change occurs in the oil?

Accepted Answer

Unsaturated fats are converted to saturated fats.

Question 15

Which equation correctly represents the hydrogenation of ethyne ($$ \mathrm{C_2H_2} ) to $$ethane ($$ \mathrm{C_2H_6} $$)?

Accepted Answer

$$ \mathrm{C_2H_2} + 2H_2 \rightarrow \mathrm{C_2H_6} $$

Question 16

A patient is exposed to trans fats formed during partial hydrogenation of vegetable oils. What is a health risk associated with trans fats?

Accepted Answer

Increased risk of cardiovascular disease

Question 17

Which of the following best explains why hydrogenation reactions are important in the food industry?

Accepted Answer

They increase the shelf life of fats by making them more saturated.

Question 18

During the hydrogenation of an alkyne, what intermediate is formed before the final alkane product?

Accepted Answer

Alkene

Question 19

Which of the following statements is TRUE about the hydrogenation of cyclohexene?

Accepted Answer

The product is cyclohexane, which is more saturated than the reactant.

Question 20

A student writes the following equation for hydrogenation: $$ \mathrm{C_4H_6} + 2H_2 \xrightarrow{	ext{catalyst}} \mathrm{C_4H_{10}} . $$What is the name of the product?

Accepted Answer

Butane

Hydrogenation Reactions in Organic Chemistry

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