MCQOPTIONS
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MCQOPTIONS
This section includes 36 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry Mcqs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following substance produce acetaldehyde on dry distillation? |
| A. | (CH3COO)2Ca |
| B. | (HCOO)2Ca |
| C. | Both (a) and (b) |
| D. | None |
| Answer» D. None | |
| 2. |
Which of the following will have the highest boiling point? |
| A. | Methanal |
| B. | Ethanal |
| C. | Propanal |
| D. | Hexanone |
| Answer» E. | |
| 3. |
The carbon atom of carbonyl group is |
| A. | Sp hybridized |
| B. | Sp2 hybridized |
| C. | Cp3 hybridized |
| D. | Dsp2 hybridized |
| Answer» C. Cp3 hybridized | |
| 4. |
Formalin is _______ % solution of formaldehyde in water |
| A. | 10% |
| B. | 20% |
| C. | 40% |
| D. | 60% |
| Answer» D. 60% | |
| 5. |
Which of the following substances does not give iodoform test? |
| A. | Acetaldehyde |
| B. | Ethyl alcohol |
| C. | Methyl alcohol |
| D. | Acetone |
| Answer» D. Acetone | |
| 6. |
Which of the following aldehydes shows rapid reaction with sodium nitroprusside? |
| A. | Formaldehyde |
| B. | Accetaldehyde |
| C. | Benzaldehyde |
| D. | Acetone |
| Answer» E. | |
| 7. |
Acetone reacts with HCN to form a cyanohydrin. It is an example of |
| A. | Electronphilic addition |
| B. | Electrophilic substitution |
| C. | Nucleophilic addition |
| D. | Nucleophilic substitution |
| Answer» D. Nucleophilic substitution | |
| 8. |
Which of the following compounds will react with Tollens reagent? |
| A. | CH3-CHO |
| B. | CH3-CH-CH3 |
| C. | CH3-COOH |
| D. | CH3-CO-CH2-CH3 |
| Answer» B. CH3-CH-CH3 | |
| 9. |
Cannizzaros reaction is not given by |
| A. | Formaldehyde |
| B. | Acetaldehyde |
| C. | Benzaldehyde |
| D. | Trimethyl acetaldehyde |
| Answer» C. Benzaldehyde | |
| 10. |
Which of the following reactions may be assoclated with aldehyde and ketone? |
| A. | Nucleophile addition |
| B. | Polymerization |
| C. | Oxidation |
| D. | All of the above |
| Answer» E. | |
| 11. |
Which of the following reagents will react with both aldehydes and ketones? |
| A. | Grignard reagent |
| B. | Tollens reagent |
| C. | Fehlings reagent |
| D. | Benedicts reagent |
| Answer» B. Tollens reagent | |
| 12. |
Ketones are comparatively less reactive than aldehdye. It is due to |
| A. | Alkyl groups are electron donating |
| B. | Steric hindrance |
| C. | Both (a) and (b) |
| D. | None |
| Answer» D. None | |
| 13. |
Which of the following do not give aldol condensation reactions? |
| A. | Formaldehyde |
| B. | Acetaldehyde |
| C. | Diemthyl ketone |
| D. | Propionaldehyde |
| Answer» B. Acetaldehyde | |
| 14. |
For aldol condensation the conditions necessary |
| A. | ?-C |
| B. | ?-H |
| C. | Basic medium |
| D. | All |
| Answer» E. | |
| 15. |
Aldehydes are reduced to |
| A. | P? alcohol |
| B. | S? alcohol |
| C. | T? alcohol |
| D. | Not possible |
| Answer» B. S? alcohol | |
| 16. |
Tetrahydroborate ion is the source of |
| A. | Proton |
| B. | H+ |
| C. | Both a & b |
| D. | H- |
| Answer» E. | |
| 17. |
Which of the following is a symmetrical ketone |
| A. | 3 - hexanone |
| B. | Acetone |
| C. | Butanone |
| D. | 2-pentanone |
| Answer» C. Butanone | |
| 18. |
Dry distillation of calcium acetate results in the formation of |
| A. | Formaldehyde |
| B. | Acetaldehyde |
| C. | Methane |
| D. | Acetone |
| Answer» E. | |
| 19. |
In base catalyzed reaction of carbonyl compound the catalyst |
| A. | Increases the nucleophilic character of reagent |
| B. | Increases electrophilic character of carbonyl compound |
| C. | Acidic character of reagent |
| D. | Both a and b |
| Answer» B. Increases electrophilic character of carbonyl compound | |
| 20. |
Cannizaros reaction takes place through the transfer of _______ from complex anion. |
| A. | Hydrogen ion |
| B. | Hydride ion |
| C. | Oxide ion |
| D. | Methoxide ion |
| Answer» C. Oxide ion | |
| 21. |
Iodoform test can be used to distinguish between |
| A. | Ethanol and methanol |
| B. | Acetaldehyde and methanal |
| C. | Acetone and diethyl ketone |
| D. | All of the above |
| Answer» E. | |
| 22. |
Formaldehyde and lactose are combined to produce throat lozenges named as |
| A. | Formamint |
| B. | Lactomint |
| C. | Aldomint |
| D. | Formalactose |
| Answer» B. Lactomint | |
| 23. |
Which of the following is not a use of acetaldehyde? |
| A. | Formation of phenolic resins |
| B. | Formation of mirror |
| C. | Antiseptic inhalant |
| D. | Formation of throat lozenges |
| Answer» E. | |
| 24. |
Formula of haloform is |
| A. | HCOX |
| B. | CX4 |
| C. | CHX3 |
| D. | CH3X |
| Answer» D. CH3X | |
| 25. |
Formaldehyde condenses with phenol in the presence of dilute H2SO4 to yield |
| A. | Nylon 66 |
| B. | Urotropine |
| C. | Aniline formaldehyde plastic |
| D. | Bakelite |
| Answer» E. | |
| 26. |
Formalin consists of mixture of formaldehyde methyl alcohol and water. Percentage of water in it is |
| A. | 60% |
| B. | 50% |
| C. | 52% |
| D. | 8% |
| Answer» D. 8% | |
| 27. |
Which of the following will not give addition reaction with NaHSO3 |
| A. | HCHO |
| B. | CH3CHO |
| C. | CH3-CH2-CHO |
| D. | None of the above |
| Answer» D. None of the above | |
| 28. |
On heating aldehydes with Fehlings solution we get a precipitate whose colour is |
| A. | Pink |
| B. | Black |
| C. | Yellow |
| D. | Brick red |
| Answer» E. | |
| 29. |
Which of the following compounds has the empirical formula CH2O and reacts with sodium hydroxide? |
| A. | Carbonic acid |
| B. | Ethanol |
| C. | Acetic acid |
| D. | Methanoic acid |
| Answer» D. Methanoic acid | |
| 30. |
Aldehyde and ketone have same general formula for homologous series |
| A. | CnH2nO2n |
| B. | CnH2n |
| C. | CnH2nO |
| D. | CnH2nOn+1 |
| Answer» D. CnH2nOn+1 | |
| 31. |
Oxidation of primary alcohol gives |
| A. | Ketone |
| B. | Aldehyde |
| C. | Alkene then - COOH |
| D. | Ester |
| Answer» C. Alkene then - COOH | |
| 32. |
Ethanal is prepared industrially by air oxidation of ethylene using palladium chloride as catalyst and _____ as promoter |
| A. | PdCl2 |
| B. | Cu2Cl2 |
| C. | CuCl2 |
| D. | PbCl2 |
| Answer» D. PbCl2 | |
| 33. |
Acetaldehyele cyanohydrin on acid hydrolysis yields |
| A. | Tartaric acid |
| B. | Propanoic acid |
| C. | Lactic acid |
| D. | Valeric acid |
| Answer» D. Valeric acid | |
| 34. |
Ncleophilic addition reactions are catalysed |
| A. | Acid |
| B. | Base |
| C. | Both a and b |
| D. | None |
| Answer» D. None | |
| 35. |
Acetal on acid hydrolysis generates |
| A. | Alcohol |
| B. | Ketone |
| C. | Both a & b |
| D. | None of the above |
| Answer» D. None of the above | |
| 36. |
Which one exhibits aldol condensation |
| A. | HCHO |
| B. | C6H5CHO |
| C. | Cl3CCHO |
| D. | CH3COCH3 |
| Answer» E. | |