Title ALCOHOLS, PHENOLS & ETHERS.pdf ✅

NEET : Chemistry [ 56 ] www.allendigital.in  Digital (B) Compounds containing sp2 C–OH bond : Vinylic alcohols These are the compounds in which the –OH group is bonded to sp2 hybridised carbon atom of a carbon-carbon double bond. H2C=CH—OH OH 1. Which of the following is an allylic alcohol? (1) CH2=CHCH2OCH3 (2) HOCH=CHCH2CH3 (3) CH3CH=CHCH2OH (4) CH2=CHCH2CH2OH 2. Identify which of the following compound is 2° alcohol ? (1) OH (2) OH (3) OH (4) OH 3. Identify 2° alcohol among the following alcohols : (1) HO (2) OH (3) OH (4) OH 4. Cyclohexanol is a (1) Primary alcohol (2) Secondary alcohol (3) Tertiary alcohol (4) Phenol Methods of Preparation of Alcohols (1) From alkenes : (a) By acidic hydration R—CH=CH2 +H2O R—CH—CH2 H OH H (b) By hydroboration oxidation R—CH=CH2 R—CH—CH2 (i) BH3/THF H OH (ii) H2O2/OH (c) By oxymercuration demercuration R—CH=CH2 R—CH—CH2 (i) Hg(OAc)2, H2O OH H (ii) NaBH4 / OH BEGINNER’S BOX-1

NEET : Chemistry [ 58 ] www.allendigital.in  Digital Methods of Preparation of Phenols 1. From haloarenes : (i) 623 K, 300 atm Cl + NaOH (ii) H OH (Dow's Process) ONa Sodium phenoxide (ii) H 2. From benzene sulphonic acid : Oleum OH (ii) H SO3H (i) NaOH (350°C) 3. From cumene (Industrial preparation of phenol) : O2 OH (ii) H / H2O CH H3C CH3 H3C—C—O—O—H CH3 H3C—C—CH3 O + Cumene Acetone hydroperoxide Cumene (Isopropyl benzene) Phenol 4. From diazonium salts : NaNO2 + NH2 OH H2O Aniline HCl (0-5)oC N2Cl Benene diazonium chloride Warm + N2 + HCl 1. When acetone reacts with Grignard reagent followed by hydrolysis, it gives : (1) 1°–alcohol (2) 2°–alcohol (3) 3°–alcohol (4) Methyl alcohol 2. For the reduction of aldehydes and ketones into alcohol the reagent which can be used is/are : (1) H2 in presence of Ni, Pt or Pd (2) NaBH4 (3) LiAlH4 (4) All of these 3. Which of the following compound when reacts with CH3Mg Br formation of 3° alcohol take place? (1) H—C—H O (2) CH3—C—H O (3) CH3—C—CH3 O (4) –C–H O BEGINNER’S BOX-2