Free Aldehydes and Ketones MCQs with Answers

• A. There is no functional group
• B. There are two functional group in reactant
• C. base acts as nucleophile as well
• D. base takes functional group H

Explanation: In the first step of the Cannizzaro reaction, the hydroxide ion acts as a nucleophile and attacks the carbonyl carbon of the aldehyde…

• A. aldehydes are good oxidizing agents
• B. alpha hydrogens in carbonyls are acidic
• C. aldehydes are good reducing agent
• D. aldehydes can easily dehydrate

Explanation: It is possible because aldehydes and ketones with alpha hydrogens are acidic and can be deprotonated by a base to form nucleophiles.

• A. Aldehyde from alcohol
• B. Aldehyde from phenol
• C. Ketones from aldehydes
• D. Ketones from methyl ketone

Explanation: Ketones react with sodium nitroprusside to form a purple-red complex, while aldehydes do not.

• A. 2, 4 - DNPH
• B. sodium bisulphite
• C. Sodium nitroprusside
• D. hydrogen cyanide

Explanation: Methyl ketones react with sodium bisulfite to form a white precipitate, while ketones do not.

• A. Silver ions
• B. tartarate ions
• C. Citrate ions
• D. Copper ions

Explanation: Bendict's solution is a blue solution that contains Cu2+ ions. When aldehydes are added to the solution, the aldehydes reduce the Cu2+…

• A. 3
• B. Zero
• C. 1
• D. 2

Explanation: An alpha hydrogen is a hydrogen atom that is bonded to a carbon atom that is directly bonded to a carbonyl group.

• A. Acetaldehyde
• B. Acetone
• C. Ethanoic acid
• D. Ethanol

Explanation: Ethanoic acid contains a carboxyl group. The carbon atom in the carboxyl group is already at its highest oxidation state, therefore, it…

• A. Formic acid
• B. Acetic acid
• C. Maionic acid
• D. Citric acid

Explanation: Ethanol can be oxidised to ethanoic acid in the presence of acidified KMnO4. Ethanoic acid is also known as acetic acid.

• A. CO
• B. H2
• C. CO2
• D. Both a & b

Explanation: For example take ethanoic acid as a carboxylic acid = CH3COOH reaction: 2CH3COOH (aq) + Na2CO3 (s) ---> 2CH3COONa (aq) + H2O (l)+ CO2 (g)…

• A. SO2
• B. CI-
• C. SO3
• D. No nucleophile is formed

Explanation: Cl- is negatively charged and attacks the carbon which has a slight positive charge in the carboxyl group.

• A. Amyl acetate
• B. Amyl butyrate
• C. lsobutyl formate
• D. Octyl acetate

Explanation: Fact: lsobutyl acetate also known as lsobutyl formate is an ester made from isobutyl alcohol and formic acid has a raspberry flavour.

• A. Banana
• B. Pineapple
• C. Jasmine
• D. Orange

Explanation: Fact: Ethyl butyrate is an ester and has the flavour of pineapple.

• A. Acetamide
• B. Acetic anhydride
• C. Acetyl chlorid
• D. Ethyl acetate

Explanation: acetamide cannot be prepared directly from acetic acid.

• A. Sodium
• B. Magnesium
• C. Potassium
• D. Copper

Explanation: The metal that cannot evolve hydrogen from acetic acid is copper.copper is less reactive than hydrogen and cannot displace it from acids.

• A. Ethanol
• B. Iodine
• C. Water
• D. Ethane

Explanation: The compound that is not formed as a result of the reaction between acetic acid, HI, and red phosphorus is ethanol.

• A. Hydrogen ion
• B. Water
• C. Alcohols
• D. All

Explanation: The first attack in esterification is due to the hydrogen ion on the carboxylic acid.

• A. Acetylene
• B. Alcohols
• C. Ethylene
• D. Aldehyde

Explanation: Acetic acid can be synthesized on a commercial scale from acetylene. The process is called Craib-Miescher process, and it is the second…

• A. Ester
• B. Acid amide
• C. Acid halide
• D. All

Explanation: Esters, acid amides, and acid halides are all derivatives of carboxylic acids.

• A. H3PO3
• B. SO2
• C. POCI3
• D. COCl2

Explanation: when ethanoic acid reacts with PCl5 formed POCl3, or phosphorus oxychloride.

• A. Alcohols
• B. Hydrocarbons
• C. Acids
• D. Esters

Explanation: Oils and fats are esters of fatty acids and glycerol. Fatty acids are long-chain carboxylic acids, and glycerol is a trihydroxy alcohol.