(2) $\mathrm{CH}_{3} \mathrm{COOH}$ Your email address will not be published. An unknown alcohol is treated with the “Lucas reagent’ to determine whether the alcohol is primary, secondary or tertiary. A liquid was mixed with ethanol and a drop of concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ was added. Give IUPAC names for the following structures. (iii) Explain the mechanism of Acid catalysed hydration of an alkene forming an alcohol. Free Sample Papers with solutions for Class 12 Chemistry,... Download past year Question Papers for Class 12 Chemistry as per CBSE NCERT KVS syllabus with solutions in pdf free. SHOW SOLUTION There are many more useful educational material which the students can download in pdf format and use them for studies. (4) 3-Methyl–2–butanone 0.1% Soln of phenol is used as an antisepticn & 1% Soln of phenol is used as a disinfectant. Ans:- (i) Grignard’s reagent is an alkyl magnesium halide. Q.3 Give a test to distinguish between phenol and Benzyl alcohol. Sol. Click here to download NCERT Solutions for questions of Class 12 Chemistry NCERT Book. The addition to the nucleophile is an irreversible process due to the high pka value of the alkyl group. During the dehydration of alcohol, the intermediate carbocation may undergo re-arrangement, resulting in the formation of a stable carbocation. SHOW SOLUTION Download HOTs Questions for Class 12 Chemistry for all important topics in Class 12 Chemistry based on CBSE NCERT syllabus and latest pattern. Nucleophilic substitution, Q. Phenol on treatment with $\mathrm{CO}_{2}$ in the presence of NaOH followed by acidification produces compound X as the major product. The alkyl group attacks the carbon of the carbonyl group to form an addition compound. The quiz portal can be accessed on Discover Gandhi portal at: https://discovergandhi.in/ DIKSHA platform (https://diksha.gov.in) and the Discover Gandhi mobile App which can be easily downloaded from Google Play Store on... Competency is a set of skills, abilities, knowledge that helps an individual perform a given task in real life. SHOW SOLUTION JEE Main Previous Year Papers Questions of Chemistry with Solutions are available at eSaral. SHOW SOLUTION Q.5 Write chemical equation Williamson synthesis. Phenol on treatment with $\mathrm{CO}_{2}$ in the presence of NaOH followed by acidification produces compound X as the major product. Which alcohol reacts fastest and by what mechanism :-(1) secondary alcoholby SN $^{1}$ (2) tertiary alcohol by SN $^{1}$ (3) secondary alcoholby SN $^{2}$ (4) tertiary alcohol by SN $^{2}$ AIEEE-2013 Please click the link below to download CBSE Class 12 Chemistry Alcohols Phenols Ethers Questions Answers. (4) Red, colourless, blue Q.3 Give the IUPAC name of the following compound: Q.4 What happen when phenol is treated with excess of bromine(aq). Practicing JEE Mains chapter wise questions of Chemistry will help the JEE aspirants in realizing the question pattern as well as help in analyzing weak & strong areas. Free PDF Download of CBSE Chemistry Multiple Choice Questions for Class 12 with Answers Chapter 11 Alcohols, Phenols and Ethers. NCERT Exemplar Problems for Class 12 Chemistry for all topics, Download Exemplar Solutions for Class 12 Chemistry and download in pdf free. The mechanism of this reaction involves the protonation of alcohol, followed by loss of a water molecule & a proton. (1), (1) $\mathrm{CH}_{2}=\mathrm{CH}-\mathrm{CH}_{2}-\mathrm{Br}+\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{ONa}$, (2) $\mathrm{C}_{6} \mathrm{H}_{5}-\mathrm{CH}=\mathrm{CH}-\mathrm{Br}+\mathrm{CH}_{3}-\mathrm{ONa}$, (3) $\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{Br}+\mathrm{CH}_{2}=\mathrm{CH}-\mathrm{CH}_{2}-\mathrm{ONa}$, (4) $\mathrm{CH}_{2}=\mathrm{CH}-\mathrm{Br}+\mathrm{C}_{6} \mathrm{H}_{5}-\mathrm{CH}_{2}-\mathrm{ONa}$, Q. (2) Ethylene Sol. AIEEE-2011 (1) 1–Butanol Ans:-Phenoxide ion is more resonance stabilised than alkoxide ion. AIEEE-2013 SHOW SOLUTION (1), Q. Jee-Main-2014 Sol. Practice test sheets for Class 12 for Chemistry made for important topics in NCERT book 2020 2021 available for free... Download syllabus for Class 12 Chemistry issued by CBSE and NCERT for 2020. Ans:- Due to electron with drawning nature of ph-group-O bond is less polar.in case of methanol methyl group is electron releasing group So C-O bond is more polar. HCl and anhydrous $\mathrm{ZnCl}_{2}$, is :-, Iodoform can be prepared from all except :-, An unknown alcohol is treated with the “Lucas reagent’ to determine whether the alcohol is primary, secondary or tertiary. Q.11 Which catalyst are used in Friedel craft reaction? AIEEE-2012 Q. Iodoform can be prepared from all except :- (3) Acetylene Q.2 Explain why Phenol do not undergo substitution of OH group like alcohol. (3) secondary alcoholby SN $^{2}$ The liquid was :- (1) Nucleophilic addition The NATIONAL EDUCATION POLICY-2020 calls for shift towards... Green Olympiad is a value driven project conducted by TERI (The Energy and Resources Institute) for school students annually since 1999. An unknown alcohol is treated with the “Lucas reagent’ to determine whether the alcohol is primary, secondary or tertiary. X on treatment with $\left(\mathrm{CH}_{3} \mathrm{CO}\right)_{2} \mathrm{O}$ in the presence of catalytic amount of $\mathrm{H}_{2} \mathrm{SO}_{4}$ produces : Phenol reacts with methyl chloroformate in the presence of NaOH to form product A. Ans:- Phenols give violet colour with ferric chloride while benzyl alcohol does not give this coloure. Enter pincode to get tutors in your city. Q17.1.1. (iii) Some reactive alkenes like 2 − methyl propene undergo direct hydration in the presence of mineral acids which act as catalysts. (1) $\mathrm{CiO}_{3}$ (1) Isobutyl alcohol Sol. Sol. (3) $\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{Br}+\mathrm{CH}_{2}=\mathrm{CH}-\mathrm{CH}_{2}-\mathrm{ONa}$ (3) $\mathrm{CH}_{3} \mathrm{OH}$ (Note: that’s not the same as hydroxide, OH-, which is ionic.) (1) Red, blue, colourless (2), Q. There are many more useful educational material which the students can download in pdf format and use them for studies. Q.1 Write the reaction of phenol with Zn. (1) 4 (2) 6 (3) 3 (4) 2 Draw and name all the alcohol isomers of C 3 H 9 O . A and B are respectively : A reacts with $\mathrm{Br}_{2}$ to form product B. A compound with a fruity smell was formed. Download solutions for... Download latest 2020 Sample Papers for Class 12 Chemistry as per CBSE NCERT pattern and syllabus. Jee-Main-2018 Use them for better understanding of the subjects. (1) Ethyl-hydrogen sulphate The number of stereoisomers possible for a compound of the molecular formula Download India's Best Exam Preparation App. –in alcohols, a hydroxyl group is connected to a carbon atom. 11.1.2 Phenols— Mono, Di and trihydric phenols Ethers are classified as simple or … AIEEE-2010 Q.2 Phenols are much more acidic than alcohols. Sol. Sol. (4) Electrophilic addition (4) $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ Students can download these useful educational material free and use them to get better marks in examinations. High Order... Access latest VBQ, Value Based Questions for Class 12 Chemistry as per CBSE and NCERT syllabus. (2), Q. (1) $\mathrm{CH}_{3} \mathrm{COCH}_{3}$ (a) (b) Indicate stereochemistry (c) (d) Q17.1.2. AIEEE-2009 (3) KMNO $_{4}$ 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. Q17.1.4. Consider the following reaction : $\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}+\mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow$ Produce Also refer to other worksheets for the same chapter and other subjects too. From amongst the following alcohols the one that would react fastest with conc. Q.8 Name a substance that can be used as an antiseptic as well as a disinfectant. Chapter 3 Alcohols, Phenols, and Ethers 2 3 Alcohols 4 The Hydroxy (—OH) Functional Group •The hydroxyl group (—OH) is found in the alcohol and phenol functional groups. Q.2 (i) Explain the mechanism of Addition of Grignard’s reagent to the carbonyl group of a compound forming an adduct followed by hydrolysis. (4) 2–Methylpropanol For example, CH3OH is methyl alcohol. In contrast the C-O bond in alcohol is pure single bond an hence can be easily released by Nu. In the Victor-Meyer’s test, the colour given by $1^{\circ}, 2^{\circ}$ and $3^{\circ}$ alcohols are respectively :-