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Alcohols, Phenols and Ethers, , , , Multiple Choice Questions (1 Mark), , , , , , L. In a carbinol system of nomenclature tert.butyl alcohol is named as, (A) trimethyl carbinol (B) dimethyl ethyl carbinol, (C) methyl carbinol (D) ethyl carbinol, , 2. Which of the following pair of reagent is used for conversion of, carboxylic acid to alcohol?, (A) LiAIH,/H;,0* (B) H,/Ni—heat, (C) B:H/H,02, OH” (D) H,/Pd, , 3. Reaction between Grignard reagent and aldehyde other than, formaldehyde leads to formation of, , , , , , (A) | primary alcohol (B) secondary alcohol, (C) _ tertiary alcohol (D) optically active alcohol, 4. Oxidation of ethyl alcohol using K,Cr,0,/dil H,SO, leads to formation, of é, (A) acetaldehyde (B) acetic acid, (C) ethane (D) acetone, , 5. | When vapours of tert.butyl alcohol are passed over hot copper, it gives, , (A) _ butanal (B) butanoic acid, (C) butanone (D) isobutylene, , , , 6. Reaction between hot conc. HI and anisole gives :, (A) phenol and methyl iodide, (B) iodobenzene and methyl alcohol Ka ash M, (C) iodobenzene and methyl iodide P ., (D) phenol and methyl alcohol, , 7. The reagents used to convert phenol to 2,4,6-tribromophenol is, , (A) Br,/CS, (B) Br2/CCly, (C) Br,/H,O0 (D) KBraq., , , , Std. XII Sci.: Chemistry
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Chapter 11: Alcohols, Phenols and Ethers Target Publications’ Pvt. Ltd., , , , , , Very Short Answer Questions (1 Mark), , , , 1. Why do phenols give deep coloration with neutral ferric chloride?, , Ans: Phenols give deep coloration with neutral ferric chloride due to, formation of ferric phenoxide., , 2 Arrange the following in decreasing order of acid strength., CH;OH, CH;—CH,-OH, CH;—-CH(OH)—CHs, (CH;);-C-OH, Ans: Decreasing order of acid strength:, CH3;OH > CH;—CH>—OH > CH;—CH(OH)-—CH; > (CH3);-C-OH, , 3. Write IUPAC name of crotonyl alcohol., Ans: IUPAC name of crotonyl alcohol: But-2-en-1-ol, , 4, Draw the structure of the major product of hydroborationoxidation of propene., , Ans: The major product of hydroboration-oxidation of propene, is propan-1-ol (CH;— CH2— CH»—OH)., , 5, Write the reaction to get aspirin from salicylic acid., Ans: Aspirin from salicylic acid:, , COOH COOH, ues q ? + C—CH; + CH;COOH, + CH;-C-O-C-CH, —#"-» ee, Salicylic acid Acetic anhydride AAspfein Acetioacid, , (Acetyl salicyclic acid), , 6. Write the name of the major product obtained when anisole reacts, with HI at 398 K., , Ans: Phenol is obtained as a major product when anisole reacts with HI at, 398 K., , [Note: Methyl iodide is also formed along with phenol.], , Ts What is the action of atmospheric oxygen on ethers?, Ans: Ethers combine with atmospheric oxygen to form peroxide., , , , Std. XII Sci.: Chemistry 2
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Ta rget Publications” Pvt. Ltd., , 6. | Write chemical equation of acetyl chloride with, , i. ethanol ii, phenol, Ans:, i, Equation of acetyl chloride with ethanol:, , I os |, CoH; — OH + Cl — C -CH; “5 CH; — C — OC)H; + HCI, Ethanol — Acetyl chloride Ethyl ethanote, , ii. | Equation of acetyl chloride with phenol:, , on ff i, (oy + Cl-C-CH; Pyridine O a Cc = CHa | HCl, Phenol Acetyl chloride, , Phenyl acetate, , , , 1. What is the action of following on phenol at low temperature?, , i. dil. HNO; ii, conc. H,SO,, iii, Br2/CS;, , i. Dilute HNO: Phenol reacts with dilute nitric acid at low temperature to give, mixture of ortho- and para-nitrophenol., , OH OH OH, NO), +HO- NO,— +, Phenol dil. HNO; o-Nitrophenol, , NO,, p-Nitrophenol, , ii. Cone. H,SO,4: At room temperature (298 K), phenol reacts with, concentrated sulphuric acid to form o-phenolsulphonic acid., , OH, SO3H, + HO-SO;H —#*->, , Phenol Cone.H,SO4 o-Phenolsulphonic acid, , | Std. MiSs Chemistry, , H
