(xii) 2-Ethoxybutane. (iv) Acidified or alkaline potassium permanganate. The sodium alkoxide needed for the purpose is prepared by the action of sodium on a suitable alcohol. (b) Classify the isomers of alcohols given in part (a) as primary, secondary and tertiary alcohols. Thus, the alkyl halide should be derived from ethanol and the alkoxide ion from 3-methylpentan-2-ol. (ii) Reimer – Tiemann reaction – Consequently, a large amount of energy is required to break these hydrogen bonds. C. Wood Further, since the electron density is relatively higher at the two o-and one p-position, therefore electrophilic substitution occurs mainly at o-and p-positions. (ii) butan-1-ol Phenol is more acidic than ethanol. Write structures of the products of the following reactions: | 21. (iii) Ethyl mag. Videos Contents1 Important Questions for CBSE Class 12 Chemistry – Alcohols, Phenols And Ethers1.1 PREVIOUS YEARS QUESTIONS1.1.1 20151.1.2 Very Short Answer Type Questions [1 Mark]1.1.3 Short Answer Type Questions [II] [3 Marks]1.1.4 Long Answer Type Questions [5 Marks]1.1.5 20141.1.6 Very Short Answer Type Questions [1 Mark]1.1.7 Short Answer Type Questions [I] [2 Marks]1.1.8 Short Answer … In alcohols, -OR group is attached to Sp3 hybridised carbon. Click the button below to download it. The hydrogenation of phenol in the presence of Ni and heat gives By Williamson’s synthesis C. Phenoxide Ans: The addition of diborane to alkenes to form trialkyl boranes followed by their oxidation with alkaline hydrogen peroxide to form alcohols is called hydroboration-oxidation. Ans: 11.11. (vi)Ethoxybenzene. Purchase Courses A. Aldehydes 11.17. The synthesis is as follows. (i) 1 -phenylethanol from a suitable alkene. The nature of alkyl and aryl groups simply modifies these properties. A. CH3OH 11.22. 11.23. | (ii) 5-Ethylheptane-2,4-dioI (i) Oxidation of a primary alcohol to carboxylic acid. Ans: (i)1-Ethoxy-2-methylpropane Absolute alcohol is obtained when the rectified spirit is treated with Oxygen is bubbled through the above solution to form cumene hydroperoxide which is decomposed with aqueous acid (C.B.S.E. Ans: Williamson’s synthesis is a versatile method for the synthesis of both symmetrical and unsymmetrical ethers. Topics and Subtopics in NCERT Solutions for Class 12 Chemistry Chapter 11 Alcohols Phenols and Ether: NCERT Solutions CBSE Sample Papers ChemistryClass 12 Chemistry. D. All of above (i) Propane → Propan-2-ol For your convenience I have added a pdf that you can download. Give reason. Write equations of the following reactions: The following transformation involves a carbocation rearrangement. Download CBSE Class 12 Chemistry Alcohols Phenols and Ethers MCQs Set A in pdf, Chemistry chapter wise Multiple Choice Questions free, Q.1 The product obtained from the reaction is. question_answer1) Butane-2-ol is [CPMT 1977, 89], question_answer2) Picric acid is [CPMT 1971, 80, 81; DPMT 1983; MP PMT 1990; BHU 1996], question_answer3) 3- pentanol is a [RPET 2002], question_answer4) Glycerol is a [DPMT 1984, 2000; MP PET 2001; J & K 2005], question_answer6) Carbon percentage is maximum in [BHU 1998], question_answer7) Ortho-dihydroxy benzene is, question_answer8) Glycerine has [MP PMT/PET 1988; MP PMT 1989, 91; AIIMS 1997], question_answer9) Which of the following is tertiary alcohol [DPMT 2000], question_answer10) Which is primary alcohol [CPMT 1980], question_answer11) Carbinol is [RPMT 2000], question_answer12) General formula of primary alcohol is [CPMT 1975], question_answer13) Which of following is phenolic [J & K 2005], question_answer14) 1, 2, 3-trihydroxybenzene is also known as, question_answer15) Butanal is an example of [MP PET 1991], question_answer17) The characteristic grouping of secondary alcohols is [DPMT 1984], question_answer18) Which of the following are isomers [AFMC 2005; BCECE 2005], question_answer19) The compound \[HOC{{H}_{2}}-C{{H}_{2}}OH\] is, question_answer21) The structural formula of cyclohexanol is [Bihar CEE 1995], question_answer22) Molecular formula of amyl alcohol is, question_answer23) Carbolic acid is [MP PET/PMT 1998; RPET 1999; KCET (Engg./Med.) The distinction test for primary secondary and tertiary alcohol required to react each of them is A. Cone. 1. Answer. HCI and anhydrous PCl2 Identify the major product, (a) (b) (c) (d) 2. The carbocation is generated by the protonation of the hydroxyl group, followed by the loss of water. Why Studyadda? Alcohol Phenol and Ether MCQ Sheet 1. (iv) 1-Methoxypropane The process involved is 11,24. For example, ethyl methyl ether, methyl phenyl ether, 4-chlorophenyl- 4-nitrophenyl ether, etc. (v) 2-Methylphenol (ii) Benzyl chloride → Benzyl alcohol Alcohols and phenols both contain a hydroxyl group (-OH). D. C2H5OH | Classify the following as primary, secondary and tertiary alcohols. B. Hydration ... Wrong Answer Wrong Explanation Wrong Question Question not related to topic Spelling Mistakes. HCI and anhydrous ZnCl2 View Answer, 20. (i)2-Methylbutan-2-ol 11.15. Alcohols Phenols and Ethers MCQs. Explain why is orthonitrophenol more acidic than orthomethoxyphenol? The release of H+ ion is therefore, easier from o-nitrophenol while it is quite difficult from o-methoxyphenol. Write mechanism of the reaction. Free Videos, Contact Us Give the IUPAC name of the following compound : (Delhi 2009) Answer: IUPAC name : 2-Bromo-3-methyl-but-2-ene-1-ol Question 2. Ans: 11.8. Explain why is orthonitrophenol more acidic than orthomethoxyphenol? C. Water B) C. Cone. Compare its acidity with that of ethanol. 11.19. e-nkrophenol p-nnrophenol. (iii) Butane-2,3-diol View Answer, 15. (a) Draw the structural formulas and write IUPAC names of all the isomeric alkanols with the molecular formula CsH12O Ans: Direct addition of H20 to ethene in presence of an acid does not occur. View Answer, 14. 11.3. D. C6H5OH (iv) Methyl mag. Q3: | PMT 2002], Copyright © 2007-2020 | The properties of alcohols and phenols are chiefly due to the presence of –OH group. Ans: 11.5. Write IUPAC names of the following compounds: Ans: (i) 2,2,4-Trimethylpentan-3-ol Write the mechanism of the reaction of HI with methoxymethane. C. Condensation polymerization Ans: Nitro (NO2) group is an electron withdrawing group while methoxy (OCH3) group is electron releasing in nature. ... methyl alcohol (c) diethyl ether (d) acetone. ​NCERT SolutionsMathsPhysicsChemistryBiologyScience​, Filed Under: CBSE, Class 12 Chemistry Tagged With: NCERT Solutions For Class 12 Chemistry Alcohols Phenols and Ether, RD Sharma Class 11 Solutions Free PDF Download, NCERT Solutions for Class 12 Computer Science (Python), NCERT Solutions for Class 12 Computer Science (C++), NCERT Solutions for Class 12 Business Studies, NCERT Solutions for Class 12 Micro Economics, NCERT Solutions for Class 12 Macro Economics, NCERT Solutions for Class 12 Entrepreneurship, NCERT Solutions for Class 12 Political Science, NCERT Solutions for Class 11 Computer Science (Python), NCERT Solutions for Class 11 Business Studies, NCERT Solutions for Class 11 Entrepreneurship, NCERT Solutions for Class 11 Political Science, NCERT Solutions for Class 11 Indian Economic Development, NCERT Solutions for Class 10 Social Science, NCERT Solutions For Class 10 Hindi Sanchayan, NCERT Solutions For Class 10 Hindi Sparsh, NCERT Solutions For Class 10 Hindi Kshitiz, NCERT Solutions For Class 10 Hindi Kritika, NCERT Solutions for Class 10 Foundation of Information Technology, NCERT Solutions for Class 9 Social Science, NCERT Solutions for Class 9 Foundation of IT, PS Verma and VK Agarwal Biology Class 9 Solutions, NCERT Solutions For Class 12 Chemistry Chapter 11 Alcohols Phenols and Ether. You are given benzene, cone. D. Tollens test (ix) 1-Methoxy-2-methylpropane | Secondary alcohol (ii) Reimer-Tiemann reaction: Treatment of phenol with CHC13 in presence of aqueous sodium or potassium hydroxide at 340 K followed by hydrolysis of the resulting product gives 2-hydroxybenzaldehyde (salicyialdehyde) as the major product. As a solvent (i)Butan-1-ol Answer=C. The halogen derivative such as bromoderivative and sodium salt of the alcohol take part in the Williamson’s synthesis. | Which alcohol will undergo elimination reaction to give alkene in the presence of acidic potassium dichromate? Explain how does the – OH group attached to a carbon of benzene ring activate it towards electrophilic substitution? Ans: Phenol may be regarded as a resonance hybrid of structures I-V, shown below. (b) Reaction with NaOH: Phenol dissolves in NaOH to form sodium phenoxide and water.

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