MCQOPTIONS
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MCQOPTIONS
This section includes 13 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which is not true about acetophenone[Manipal 2002] |
| A. | Reacts to form 2, 4-dinitorphenyl hydrazine |
| B. | Reacts with Tollen?s reagent to form silver mirror |
| C. | Reacts with \[{{I}_{2}}/NaOH\] to form iodoform |
| D. | On oxidation with alkaline \[KMn{{O}_{4}}\] followed by hydrolysis gives benzoic acid |
| Answer» C. Reacts with \[{{I}_{2}}/NaOH\] to form iodoform | |
| 2. |
Compound ?A? (molecular formula \[{{C}_{3}}{{H}_{8}}O)\] is treated with acidified potassium dichromate to form a product ?B? (molecular formula \[{{C}_{3}}{{H}_{6}}O).\] ?B? forms a shining silver mirror on warming with ammoniacal silver nitrate. ?B? when treated with an aqueous solution of \[{{H}_{2}}NCONHN{{H}_{2}}.HCl\] and sodium acetate gives a product ?C?. Identify the structure of ?C? [IIT-JEE (Screening) 2002] |
| A. | \[C{{H}_{3}}C{{H}_{2}}CH=NNHCON{{H}_{2}}\] |
| B. | \[C{{H}_{3}}-CH=\underset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,}{\mathop{NNH}}\,}}\,CON{{H}_{2}}\] |
| C. | \[C{{H}_{3}}CH=\underset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,}{\mathop{NCO}}\,}}\,NHN{{H}_{2}}\] |
| D. | \[C{{H}_{3}}C{{H}_{2}}CH-NCONHN{{H}_{2}}\] |
| Answer» B. \[C{{H}_{3}}-CH=\underset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,}{\mathop{NNH}}\,}}\,CON{{H}_{2}}\] | |
| 3. |
Which alkene is formed from the following reaction \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}CH=PP{{h}_{3}}+2-\,\text{Butanone}\] [Manipal 2001] |
| A. | 3- Methyl-3-heptene |
| B. | 4-Methyl-3-heptene |
| C. | 5-Methyl-3-heptene |
| D. | 1-Methyl-5- methane |
| Answer» B. 4-Methyl-3-heptene | |
| 4. |
The key step in cannizzaro?s reaction is the intermolecular shift of[Orissa JEE 2003] |
| A. | Proton |
| B. | Hydride ion |
| C. | Hydronium ion |
| D. | Hydrogen bond |
| Answer» C. Hydronium ion | |
| 5. |
The most reactive compound towards formation of cyanohydrin on treatment with KCN followed by acidification is [GATE 2001] |
| A. | Benzaldehyde |
| B. | p-Nitrobenzaldehyde |
| C. | Phenyl acetaldehyde |
| D. | p-Hydroxybenzaldehyde |
| Answer» C. Phenyl acetaldehyde | |
| 6. |
The product(s) obtained via oxymercuration \[(HgS{{O}_{4}}+{{H}_{2}}S{{O}_{4}})\] of 1-butyne would be [IIT-JEE 1999] |
| A. | \[C{{H}_{3}}C{{H}_{2}}COC{{H}_{3}}\] |
| B. | \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}CHO\] |
| C. | \[C{{H}_{3}}C{{H}_{2}}CHO+HCHO\] |
| D. | \[C{{H}_{3}}C{{H}_{2}}COOH+HCOOH\] |
| Answer» B. \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}CHO\] | |
| 7. |
Which of the following statements regarding chemical properties of acetophenone are wrong (1) It is reduced to methyl phenyl carbinol by sodium and ethanol (2) It is oxidised to benzoic acid with acidified \[KMn{{O}_{4}}\] (3) It does not undergo iodoform electrophilic substitution like nitration at meta position (4) It does not undergo iodoform reaction with iodine and alkali [Tamil Nadu CET 2001] |
| A. | 1 and 2 |
| B. | 2 and 4 |
| C. | 3 and 4 |
| D. | 1 and 3 |
| Answer» D. 1 and 3 | |
| 8. |
Aldehyde and ketones can decolourize by [CPMT 2003] |
| A. | Bromine water |
| B. | Quick lime |
| C. | dil. \[{{H}_{2}}S{{O}_{4}}\] |
| D. | None of these |
| Answer» E. | |
| 9. |
Which of the following reactions give benzo phenone [Roorkee Qualifying 1998] |
| A. | \[2{{C}_{6}}{{H}_{6}}+CC{{l}_{4}}\underset{\text{(ii) }{{H}_{2}}O}{\mathop{\xrightarrow{\text{(i) }AlC{{l}_{3}}}}}\,\] |
| B. | \[{{C}_{6}}{{H}_{6}}+{{C}_{6}}{{H}_{5}}COCl\underset{{}}{\mathop{\xrightarrow{AlC{{l}_{3}}}}}\,\] |
| C. | \[o-C{{H}_{3}}{{C}_{6}}{{H}_{4}}CO{{C}_{6}}{{H}_{5}}\xrightarrow{\text{Heat}}\] |
| D. | \[o-HOOC-{{C}_{6}}{{H}_{4}}-CO{{C}_{6}}{{H}_{5}}\underset{{{260}^{o}}C}{\mathop{\xrightarrow{Cu}}}\,\] |
| Answer» C. \[o-C{{H}_{3}}{{C}_{6}}{{H}_{4}}CO{{C}_{6}}{{H}_{5}}\xrightarrow{\text{Heat}}\] | |
| 10. |
Which of the following will give yellow precipitate with \[{{I}_{2}}/NaOH\] [IIT 1997] |
| A. | \[IC{{H}_{2}}COC{{H}_{2}}C{{H}_{3}}\] |
| B. | \[C{{H}_{3}}COOCOC{{H}_{3}}\] |
| C. | \[C{{H}_{3}}CON{{H}_{2}}\] |
| D. | \[C{{H}_{3}}CH(OH)C{{H}_{2}}C{{H}_{3}}\] |
| Answer» B. \[C{{H}_{3}}COOCOC{{H}_{3}}\] | |
| 11. |
Among the given compounds, the most susceptible to nucleophilic attack at the carbonyl group is [IIT 1997] |
| A. | MeCOCl |
| B. | MeCHO |
| C. | MeCOOMe |
| D. | MeCOOCOMe |
| Answer» B. MeCHO | |
| 12. |
Which of the following has the most acidic hydrogen [IIT-JEE (Screening) 2000] |
| A. | 3-hexanone |
| B. | 2, 4-hexanedione |
| C. | 2, 5-hexanedione |
| D. | 2, 3-hexanedione |
| Answer» C. 2, 5-hexanedione | |
| 13. |
The appropriate reagent for the transformation [IIT-JEE (Screening) 2000] |
| A. | \[Zn(Hg),\,HCl\] |
| B. | \[N{{H}_{2}}N{{H}_{2}}O{{H}^{-}}\] |
| C. | \[{{H}_{2}}/Ni\] |
| D. | \[NaB{{H}_{4}}\] |
| Answer» C. \[{{H}_{2}}/Ni\] | |