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Chemistry /
Aldehydes and Ketones /
2026 /
Quiz 3

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MDCAT Practice Test - Practice Test - Chemistry - Aldehydes and Ketones - 2026 Quiz

Attempt 10 MCQs on MDCAT Practice Test - Practice Test - Chemistry - Aldehydes and Ketones (Year 2026) | Quiz 3

21. Which ozonolysis workup gives aldehydes?

Reductive ozonolysis
Oxidative ozonolysis
Both
Neither

22. Which reaction produces benzaldehyde from benzene?

Gattermann-Koch reaction
Vilsmeier-Haack reaction
Reimer-Tiemann reaction
Friedel-Crafts acylation

23. Which reaction uses POCl3/DMF to introduce aldehyde group?

Vilsmeier-Haack
Gattermann-Koch
Friedel-Crafts
Reimer-Tiemann

24. Which reagent selectively reduces esters to aldehydes?

DIBAL-H reduction of esters
LiAlH4 reduction of esters
NaBH4 reduction of esters
H2/Ni reduction of esters

25. What reaction of alkenes with CO/H2 gives aldehydes?

Hydroformylation
Hydrogenation
Hydroboration
Hydration

26. Which is more reactive towards nucleophiles: aldehydes or ketones?

More reactive
Less reactive
Equally reactive
Ketones are more reactive

27. What is the nature of the carbonyl carbon in aldehydes and ketones?

Electrophilic
Nucleophilic
Radical
Carbene

28. Which property distinguishes aldehydes from ketones?

Susceptible to oxidation
Resistant to oxidation
Both oxidize
Neither oxidizes

29. How do electron-withdrawing substituents affect carbonyl reactivity?

Increase reactivity
Decrease reactivity
No effect
Only steric effect

30. Is nucleophilic addition to carbonyls reversible?

Reversible
Irreversible
Concerted
Radical

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