Organic Chemistry : Redox Chemistry
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Example Questions
Example Question #3 : Using Sodium Borohydride
Which of the following statements is false?
None of these
None of these
These are all true uses of 
Example Question #1 : Organic Reducing Agents
What is the product of the reaction between magnesium and any alkyl halide, in anhydrous ether?
An alkane
An alcohol
An aldehyde
A Grignard reagent
An organolithium
A Grignard reagent
The reaction between magnesium and an alkyl halide in anhydrous ether results in a Grignard reagent.
An organolithium would result from the same process, but the magnesium would need to be replaced by two equivalents of lithium. Alcohols are products of reactions between a Grignard reagent and a carbonyl.
Example Question #1 : Using Grignard Reagents
What type of reaction would ensue if the ketone compound shown was introduced to 
Oxidation-reduction reaction
Grignard addition reaction
No reaction
No reaction
Grignard reagents are known for their ability to readily attack carbonyls at the point of their carbons. However, Grignard reagents do not work in the presence of protic solvents. Rather than reacting with the desired molecule, the Grignard is so unstable that it will readily accept a proton from a protic solvent. The Grignard then becomes inert and no reaction ensues with the desired molecule.
Example Question #1 : Using Grignard Reagents
3-bromopropene was treated with
What is the final major product?
Hexanol
Cyclohexene
6-bromohex-4-ene
Hexene
Hexene
Any time we have a Grignard reagent and a primary haloalkane, we will see a substitution reaction, identical to an 
Example Question #4 : Using Grignard Reagents
What reactant(s) is/are needed to drive this reaction?
The carbons on the epoxide compound experience a slightly positive charge. As a result, a Gringard reagent can easily attack the less substituted side of the epoxide to break the ring and to form a six membered carbon chain. 
Example Question #1 : Using Lithium Aluminum Hydride
Which of the following can be reduced when mixed with 
Example Question #1 : Using Lithium Aluminum Hydride
What reagents are needed to satisfy the given reaction?
This problem requires that we convert our ketone group into a chlorine. However, this cannot be done directly, and requires multiple steps.
We begin by reducing the ketone with 
Example Question #21 : Redox Chemistry
What is the product of the given reaction?
III
IV
V
I
II
IV
First step: esterification
Second step: lithium aluminum hydride reduction
Third step: neutralization to form primary alcohol
Fourth step: SN2 reaction to form final chlorinated product
Example Question #22 : Redox Chemistry
What is the result of the following reaction?
All of the above
Lithium Aluminum Hydride is a potent reducing agent; it has the ability to turn esters and aldehydes into primary alcohols, and ketones into secondary alcohols. The starting material is an aldehyde, so the correct answer is thus a primary alcohol ONLY.
Example Question #23 : Redox Chemistry
Which of the following is not a reducing agent?
All of the other listed compounds are reducing agents.
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