Organic Chemistry - Alcohols and Carbonyls Practice Questions
A-Levels · A-Level Chemistry · 146 free MCQs with instant results and detailed explanations.
146
Total
40
Easy
75
Medium
31
Hard
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Sample Questions from Organic Chemistry - Alcohols and Carbonyls
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Q1
Easy
Which of the following functional groups characterizes alcohols?
A.
-OH
B.
-COOH
C.
-CHO
D.
-C=O
Show Answer & Explanation
Correct Answer: A
Alcohols are characterized by the presence of a hydroxyl group (-OH). This group is what defines alcohol and differentiates them from other organic compounds.
Q2
Easy
What type of reaction occurs when a primary alcohol is oxidized?
A.
Formation of an aldehyde
B.
Formation of a ketone
C.
Formation of an alkene
D.
Formation of a carboxylic acid
Show Answer & Explanation
Correct Answer: A
When a primary alcohol is oxidized, it initially forms an aldehyde. With further oxidation, it can become a carboxylic acid, but the first product is the aldehyde.
Q3
Easy
Which of the following is a characteristic property of carbonyl compounds?
A.
They form hydrogen bonds with water.
B.
They undergo nucleophilic addition reactions.
C.
They have very high boiling points.
D.
They do not react with oxidizing agents.
Show Answer & Explanation
Correct Answer: B
Carbonyl compounds, such as aldehydes and ketones, are known to undergo nucleophilic addition reactions due to the electrophilic nature of the carbonyl carbon.
Q4
Medium
Which of the following statements correctly describes the hydrogen bonding in alcohols?
A.
Alcohols can only form hydrogen bonds with water.
B.
Hydrogen bonding occurs between the hydroxyl group and other polar molecules.
C.
Alcohols do not exhibit hydrogen bonding due to their non-polar nature.
D.
Hydrogen bonds in alcohols are weaker than those in carboxylic acids.
Show Answer & Explanation
Correct Answer: B
Alcohols can form hydrogen bonds between the hydroxyl (-OH) group and other polar molecules, enhancing their solubility in water and affecting their physical properties.
Q5
Medium
Which alcohol will have the highest boiling point?
A.
1-Butanol
B.
2-Butanol
C.
2-Methyl-2-propanol
D.
Ethanol
Show Answer & Explanation
Correct Answer: C
2-Methyl-2-propanol has a higher boiling point due to its higher molecular weight and branching which allows for more significant van der Waals forces, although it is also influenced by hydrogen bonding.
Q6
Medium
In oxidation reactions, which reagent is typically used to convert a primary alcohol into an aldehyde?
A.
Potassium dichromate in sulfuric acid (H2SO4)
B.
Sodium dichromate
C.
Hydrochloric acid (HCl)
D.
Potassium permanganate (KMnO4)
Show Answer & Explanation
Correct Answer: A
Potassium dichromate in sulfuric acid is commonly used to oxidize primary alcohols to aldehydes, as it effectively facilitates the removal of hydrogen atoms.
Q7
Medium
Which compound is a ketone resulting from the oxidation of a secondary alcohol?
A.
Propan-2-ol
B.
Butan-2-one
C.
Ethanol
D.
Hexan-3-ol
Show Answer & Explanation
Correct Answer: B
Butan-2-one is a ketone formed from the oxidation of the secondary alcohol butan-2-ol. Secondary alcohols oxidize to form ketones.
Q8
Hard
Which of the following statements correctly describes the reactivity of primary alcohols compared to secondary and tertiary alcohols?
A.
Primary alcohols are more reactive than secondary and tertiary alcohols due to steric hindrance.
B.
Secondary alcohols are more reactive than primary alcohols because they can form more stable carbocations.
C.
Tertiary alcohols are more reactive than primary alcohols due to the stability of their carbocations during dehydration.
D.
All alcohols react at the same rate regardless of their structure.
Show Answer & Explanation
Correct Answer: C
Tertiary alcohols are more reactive than primary alcohols because they form more stable carbocations during dehydration reactions. The steric hindrance in tertiary alcohols allows for better stabilization of the positive charge.
Q9
Hard
When a primary alcohol is oxidized, which of the following functional groups is produced?
A.
Ketone
B.
Aldehyde
C.
Carboxylic acid
D.
Ether
Show Answer & Explanation
Correct Answer: B
The oxidation of a primary alcohol initially produces an aldehyde. If the oxidation continues, it can further oxidize to a carboxylic acid, but the immediate product is the aldehyde.
Q10
Hard
Which of the following statements best describes the mechanism of the oxidation of primary alcohols to aldehydes?
A.
The reaction proceeds via the formation of a carboxylic acid as an intermediate.
B.
The oxidation involves the loss of two hydrogen atoms and the formation of a C=O bond.
C.
The process requires a strong acid to facilitate dehydration.
D.
The reaction occurs through a radical mechanism involving the formation of an alkoxy radical.
Show Answer & Explanation
Correct Answer: B
The oxidation of primary alcohols to aldehydes involves the loss of two hydrogen atoms: one from the hydroxyl group and one from the carbon bonded to the hydroxyl group, resulting in the formation of a carbonyl (C=O) bond.
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Organic Chemistry - Alcohols and Carbonyls — A-Levels A-Level Chemistry Practice Questions Online
This page contains 146 practice MCQs for the chapter Organic Chemistry - Alcohols and Carbonyls in A-Levels A-Level Chemistry. The questions are organized by difficulty — 40 easy, 75 medium, 31 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit.