alcohols, phenols and ethers important questions with answers pdf

(iii) Reimer-Tiemann reaction: On treating phenol with chloroform in the presence of sodium hydroxide, a –CHO group is introduced at the ortho position of the benzene ring. Explain the fact that in alkyl aryl ethers, alkoxy group : Access NCERT Solutions for Class 12 Chemistry. Ans:-Phenol can be used as an antiseptic as well as a disinfectant. Read the latest news and announcements from NCERT and CBSE below. In addition to this,  O-nitrophenoxide ion is stabilized by resonance, 1 thereby making O-nitrophenol a stronger acid. These ncert book chapter wise questions and answers are very helpful for CBSE board exam. mechanism for hydration of acid-catalyzed ethene is as follows: Step 1: Protonation of the alkene to form carbocation by an electrophilic attack of H. Give simple chemical tests to distinguish between the following pairs of compounds: (i) Ethanol gives +ve Iodoform test whereas Phenol gives a -ve Iodoform test. The students are advised to go through the links mentioned below: CBSE 12th Chemistry Board Exam 2020: Important Questions & Answers from Chapter 10 - Haloalkanes and Haloarenes, CBSE 12th Chemistry Board Exam 2020: Important Questions & Answers from All Chapters of NCERT Textbooks - Part I & II, CBSE Board Exam 2020: Check Important Questions of Class 12th Chemistry Subject, This website uses cookie or similar technologies, to enhance your browsing experience and provide personalised recommendations. Study material like concept maps, important and sure shot question banks, quick to learn flash cards, flow charts, mind maps, teacher notes, important formulas, past examinations question bank, important concepts taught by teachers. Ortho hydroxybenzoic acid is formed as the main reaction product. Important Questions for CBSE Class 12 Chemistry – Alcohols, Phenols And Ethers PREVIOUS YEARS QUESTIONS 2015 Very Short Answer Type Questions [1 Mark] Question 1: Write the IUPAC name of the given compound: Answer: 2,2-Dimethyl propan-l-ol. The addition to the nucleophile is an irreversible process due to the high pka value of the alkyl group. Why. The intend of this article is to guide the students about the course of action they should follow once they receive the CBSE question papers in the school as well as board examination centre. Q.1 Give the IUPAC name of the following. 3. The addition of water to the double bond takes place in accordance with Markonikoff’s rule. (ii) When heated with concentrated sulphuric acid, phosphoric acid or boric acid, alcohols undergo dehydration to form alkenes. Hence, it undergoes electrophilic substitution with carbon dioxide, a weak electrophile. All Chapter 11 - Alcohols, Phenols and Ethers Exercises Questions with Solutions to help you to revise complete Syllabus and boost your score more in examinations. The intermediate substituted benzal chloride is hydrolysed in the presence of alkali to produce salicylaldehyde. These questions are based on the latest CBSE Class 12 Chemistry Syllabus. By continuing to use our website, you agree to our. Download latest curriculum with important topics, chapter weightage, topic wise... Access topic wise Projects for Class 12 Chemistry for important topics of all chapters in Class 12 Chemistry Book. (ii) Propan-1-ol < 4-methylphenol < phenol < 3-nitrophenol < 3,5-dinitrophenol < 2,4, 6-trinitrophenol. Anisole undergoes Friedel-Crafts reaction, i.e., the alkyl and acyl groups are introduced at ortho and para positions by reaction with an alkyl halide and acyl halide in the presence of anhydrous aluminium chloride (a Lewis acid) as a catalyst. (iv) Friedel-Crafts reaction: Anisole undergoes Friedel-Crafts reaction, i.e., the alkyl and acyl groups are introduced at ortho and para positions by reaction with an alkyl halide and acyl halide in the presence of anhydrous aluminium chloride (a Lewis acid) as a catalyst. Alcohol is more soluble in water than the hydrocarbons of comparable molecular masses. Ortho hydroxybenzoic acid is formed as the main reaction product. myCBSEguide | CBSE Papers & NCERT Solutions. group, electron density in the – OH bond decreases and proton loss is easier. acid dehydration of ethanol to yield ethene. The main concepts include the classification of alcohol and ether, preparation and important reactions. (ii) The mechanism for hydration of acid-catalyzed ethene is as follows: Step 1: Protonation of the alkene to form carbocation by an electrophilic attack of H3O+. Q.2 Phenols are much more acidic than alcohols. Q.1 Phenols are as a smaller dipole moment than methanol. Classify the following as primary, secondary and tertiary alcohols: 2. Download all VBQ for Class 12 Chemistry in pdf free. NEET Chemistry Alcohols,Phenols and Ethers questions & solutions with PDF and difficulty level Phenols are also converted to ethers by this method. Click here... Free download latest Useful Resources like important concepts, sure shot questions, guess papers, exam notes and other study material for Class 12 Chemistry as... Free CBSE Class 12 Chemistry Online Mock Test with important multiple choice questions as per CBSE syllabus. CBSE Reduced Syllabus by 30% for Session 2020-21, When CBSE will Conduct Remaining Exams (COVID-19), 6 – General Principles and Processes of Isolation of Elements, 12 – Aldehydes, Ketones and Carboxylic Acids, 11.5 Some Commerically Important Alcohols. (ii) The following steps are carried out in the dehydration of ethanol to yield ethene: Step 1:  Formation of protonated alcohol: Step 3:  Formation of ethene by the elimination of a proton: Question 6-  Arrange the following in the increasing order of their acidic strength: (ii) Propan-1-ol, 2,4,6-trinitrophenol, 3-nitrophenol, 3,5-dinitrophenol, phenol, 4-methylphenol. NCERT Solutions for CBSE Class 12 Chemistry have total 16 chapters. Better results are obtained if the alkyl halide is primary. Study material like concept maps, important and sure shot question banks, quick to learn flash cards, flow charts, mind maps, teacher notes, important formulas, past examinations question bank, important … NCERT Exemplar Problems for Class 12 Chemistry for all topics, Download Exemplar Solutions for Class 12 Chemistry and download in pdf free. This reaction is known as Reimer - Tiemann reaction. Download   NCERT solutions for  alcohol phenol and ether In text Questions as PDF. Due to the strong – R and -1 effect of the – NO. The intend of this article is to present before you the 5 most efficient tips to facilitate the students to revise the entire course for the Annual School and Board Examination. MCQ Questions for Class 12 Chemistry with Answers were prepared based on the latest exam pattern. Question 7- (i) What happens when CH3—O—CH

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