In Class 12 Boards there will be Case studies and Passage Based Questions will be asked, So practice these types of questions. Study Rate is always there to help you. Free PDF Download of CBSE Class 12 Chemistry Chapter 11 Alcohols, Phenols and Ethers Case Study and Passage Based Questions with Answers were Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Chemistry Case Study Questions Alcohols, Phenols, and Ethers to know their preparation level.
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In CBSE Class 12 Chemistry Paper, There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.
Alcohols, Phenols, and Ethers Case Study Questions With Answers
Here, we have provided case-based/passage-based questions for Class 12 Chemistry Chapter 11 Alcohols, Phenols, and Ethers
Case Study/Passage-Based Questions
Case Study 1: An organic compound (A) having molecular formula C6H6O gives a characteristic color with an aqueous FeCl3Â solution. (A) on treatment with CO2Â and NaOH at 400 K under pressure gives (B), which on acidification gives a compound (C). The compound (C) reacts with acetyl chloride to give (D) which is a popular pain killer.
(i) Compound (A) is
| (a) 2-hexanol | (b) dimethyl ether | (c) phenol | (d) 2-methyl pentanol. |
Answer: (c) phenol
(ii) Number of carbon atoms in compound (D) is
| (a) 7 | (b) 6 | (c) 8 | (d) 9 |
Answer: (d) 9
(iii) The conversion of compound (A) to (C) is known as
| (a) Reimer- Tiemann reaction | (b) Kolbe’s reaction | (c) Schmidt reaction | (d) Swarts reaction |
Answer: (b) Kolbe’s reaction
(iv) Compound (A) on heating with compound (C) in presence of POCl3 gives a compound (D) which is used
| (a) in perfumery as a flavoring agent | (b) as an antipyretic | (c) as an analgesic | (d) as an intestinal antiseptic. |
Answer: (d) as an intestinal antiseptic.
Case Study 2: Although chlorobenzene is inert to nucleophilic substitution, however, it gives a quantitative yield of phenol when heated with aq. NaOH at high temperatures and under high pressure. As far as electrophilic substitution in phenol is concerned the – OH group is an activating group, hence, its presence enhances the electrophilic substitution at o- and p-positions.
(i) Conversion of chlorobenzene into phenol involves
| (a) modified SN1 mechanism | (b) modified SN2 mechanism |
| (c) both (a) and (b) | (d) elimination-addition mechanism. |
Answer: (d) elimination-addition mechanism.
(ii) Phenol undergoes electrophilic substitution more readily than benzene because
| (a) the intermediate carbo cation is a resonance hybrid of more resonating structures than that from benzene |
| (b) the intermediate is more stable as it has positive charge on oxygen, which can be better accommodated than on carbon |
| (c) in one of the canonical structures, every atom (except hydrogen) has complete octet |
| (d) the -OH group is o, p-directing which like all other o, p-directing group, is activating. |
Answer: (c) in one of the canonical structures, every atom (except hydrogen) has complete octet.
(iii) Phenol on treatment with an excess of conc. HNO3Â gives
| (a) o-nitrophenol | (b) p-nitrophenol |
| (c) o-and p-nitrophenol | (d) 2,4,6-trinitrophenol |
Answer: (b) p-nitrophenol
Case Study 3: A compound (X) containing C, Hand O is unreactive towards sodium. It also does not react with Schiff’s reagent. On refluxing with an excess ofhydroiodic acid, (X) yields only one organic product (Y). On hydrolysis, (Y) yields a new compound (Z) which can be converted into (Y) by reaction with red phosphorus and iodine. The compound (Z) on oxidation with potassium permanganate gives a carboxylic acid. The equivalent weight of this acid is 60.
(i) The compound (X) is an
| (a) acid | (b) aldehyde | (c) alcohol | (d) ether |
Answer: (d) ether
(ii) The IUPAC name of the acid formed is
| (a) methanoic acid | (b) ethanoic acid | (c) propanoic acid | (d) butanoic acid. |
Answer: (b) ethanoic acid
(iii) Compound (Y) is
| (a) ethyl iodide | (b) methyl iodide | (c) propyl iodide | (d) mixture of (a) and (b). |
Answer: (a) ethyl iodide
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