Quiz on Reducing agents in organic chemistry

Reducing Agents in Organic Chemistry (20 Questions)

1. Which reducing agent is commonly used to reduce aldehydes to primary alcohols?

A. LiAlH₄ B. H₂/Ni C. NaBH₄ D. Zn/HCl

2. Which reducing agent is most suitable for reducing nitrobenzene to aniline?

A. Zn/HCl B. NaBH₄ C. LiAlH₄ D. Na/Hg in ethanol

3. Clemmensen reduction uses:

A. Zn/HCl B. Zn/NaOH C. Zn/H₂SO₄ D. Zn/HNO₃

4. Wolff-Kishner reduction is carried out in:

A. Acidic medium B. Basic medium C. Neutral medium D. Alcoholic medium

5. Which reagent is used in Birch reduction?

A. Na/NH₃ B. Zn/HCl C. NaBH₄ D. H₂/Pt

6. LiAlH₄ cannot reduce:

A. Ester B. Acid chloride C. Nitro group D. Alkene

7. Which reagent is used in Rosenmund reduction?

A. H₂/Pd-BaSO₄ B. H₂/Ni C. Zn/HCl D. LiAlH₄

8. The reduction of ketones to alkanes can be achieved by:

A. Zn/HCl B. Clemmensen reduction C. Wolff-Kishner reduction D. Both B and C

9. Sodium borohydride reduces:

A. Esters B. Aldehydes C. Acid chlorides D. Carboxylic acids

10. Birch reduction of benzene gives:

A. Cyclohexane B. Cyclohexadiene C. Cyclohexene D. Benzyl alcohol

11. Which reagent reduces acyl chloride to aldehyde?

A. Zn/HCl B. Rosenmund catalyst C. NaBH₄ D. LiAlH₄

12. Which reduction method converts carbonyl compounds into alkanes?

A. Clemmensen B. Rosenmund C. Birch D. Catalytic hydrogenation

13. Which metal is used in Wolff-Kishner reduction?

A. Zn B. None C. Fe D. Ni

14. Zn/Ammonium chloride is used for:

A. Reduction of nitro compounds B. Reduction of esters C. Reduction of aldehydes D. Reduction of alkenes

15. Catalytic hydrogenation of alkenes is an example of:

A. Oxidation B. Reduction C. Hydrolysis D. Substitution

16. Which reagent reduces alkynes to trans-alkenes?

A. Lindlar’s catalyst B. Na/NH₃ C. Pd/C D. Zn/HCl

17. Which reagent reduces alkynes to cis-alkenes?

A. Lindlar’s catalyst B. Na/NH₃ C. Rosenmund catalyst D. Zn/HCl

18. LiAlH₄ reduces esters into:

A. Aldehydes B. Ketones C. Alcohols D. Acids

19. Which reagent is selective for aldehydes but not ketones?

A. NaBH₄ B. Tollen’s reagent C. Zn/HCl D. LiAlH₄

20. Catalytic hydrogenation of benzene produces:

A. Cyclohexane B. Cyclohexadiene C. Cyclohexene D. Benzyl alcohol