Redox Chemistry

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Organic Chemistry › Redox Chemistry

Questions 1 - 10
1

A student reacts sodium chloride and lithium bromide. He collects the products in a jar and performs several tests on them. He concludes that product A has a metal and a nonmetal and that the metal has an oxidation number of whereas the nonmetal has an oxidation number of . What can you conclude from these results?

The results seem invalid

The identity of product A is sodium bromide

The identity of product A is lithium chloride

The other product will have similar oxidation numbers (metal: and nonmetal: )

Explanation

The reaction stated in this question is as follows.

This is a double replacement reaction. Both products contain a metal (an alkali metal) and a nonmetal (a halogen). The oxidation number of all alkali metals (first column of periodic table) is and of all halogens (seventh column of periodic table) is . The results stated in the question seem invalid because a halogen can never have an oxidation number of .

2

A student reacts sodium chloride and lithium bromide. He collects the products in a jar and performs several tests on them. He concludes that product A has a metal and a nonmetal and that the metal has an oxidation number of whereas the nonmetal has an oxidation number of . What can you conclude from these results?

The results seem invalid

The identity of product A is sodium bromide

The identity of product A is lithium chloride

The other product will have similar oxidation numbers (metal: and nonmetal: )

Explanation

The reaction stated in this question is as follows.

This is a double replacement reaction. Both products contain a metal (an alkali metal) and a nonmetal (a halogen). The oxidation number of all alkali metals (first column of periodic table) is and of all halogens (seventh column of periodic table) is . The results stated in the question seem invalid because a halogen can never have an oxidation number of .

3

A student reacts sodium chloride and lithium bromide. He collects the products in a jar and performs several tests on them. He concludes that product A has a metal and a nonmetal and that the metal has an oxidation number of whereas the nonmetal has an oxidation number of . What can you conclude from these results?

The results seem invalid

The identity of product A is sodium bromide

The identity of product A is lithium chloride

The other product will have similar oxidation numbers (metal: and nonmetal: )

Explanation

The reaction stated in this question is as follows.

This is a double replacement reaction. Both products contain a metal (an alkali metal) and a nonmetal (a halogen). The oxidation number of all alkali metals (first column of periodic table) is and of all halogens (seventh column of periodic table) is . The results stated in the question seem invalid because a halogen can never have an oxidation number of .

4

What is an appropriate reagent to convert a primary alcohol to an aldehyde?

Explanation

To form the aldehyde, the alcohol must be oxidized. However, potassium permanganate and chromic acid are too strong and would yield a carboxylic acid. Ozonolysis works with alkenes and oxygen over platinum would not react. PCC is correct because it will oxidize the alcohol to form an aldehyde but is too weak to continue on to form the carboxylic acid.

5

Which of the following compounds is not a reducing agent?

Explanation

is the only compound listed that is not a reducing agent. Pyridinium chlorochromate is a weak oxidizing agent and is often used to oxidize alcohols into carbony compounds. All of the other compounds are similar in that they function as reducing agents.

6

What is an appropriate reagent to convert a primary alcohol to an aldehyde?

Explanation

To form the aldehyde, the alcohol must be oxidized. However, potassium permanganate and chromic acid are too strong and would yield a carboxylic acid. Ozonolysis works with alkenes and oxygen over platinum would not react. PCC is correct because it will oxidize the alcohol to form an aldehyde but is too weak to continue on to form the carboxylic acid.

7

Which of the following reagents can turn primary alcohols into a carboxylic acid?

Jones Reagent (chromic acid in acetone)

Tollen's test

PCC

Explanation

The Jones reagent can convert primary alcohol to acids and secondary alcohols to ketones. The Tollen's test only converts aldehydes to carboxylic acids. PCC can only convert primary and secondary alcohol to aldehydes and ketones, respectively. and are reducing agents.

8

Which of the following compounds is not a reducing agent?

Explanation

is the only compound listed that is not a reducing agent. Pyridinium chlorochromate is a weak oxidizing agent and is often used to oxidize alcohols into carbony compounds. All of the other compounds are similar in that they function as reducing agents.

9

What is an appropriate reagent to convert a primary alcohol to an aldehyde?

Explanation

To form the aldehyde, the alcohol must be oxidized. However, potassium permanganate and chromic acid are too strong and would yield a carboxylic acid. Ozonolysis works with alkenes and oxygen over platinum would not react. PCC is correct because it will oxidize the alcohol to form an aldehyde but is too weak to continue on to form the carboxylic acid.

10

Which of the following compounds is not a reducing agent?

Explanation

is the only compound listed that is not a reducing agent. Pyridinium chlorochromate is a weak oxidizing agent and is often used to oxidize alcohols into carbony compounds. All of the other compounds are similar in that they function as reducing agents.

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