Chapterwise Previous year Qs

Transcription

1 221 ALCOHAL PHENOLS AND ETHERS 1. Which one is formed when sodium phenoxide is heated with ethyl iodide? [1988] Phenetole Ethyl phenyl alcohol Phenol None of these Ans: 2. Lucas reagent is [1988] Conc. HCl and anhydrous ZnCl2 Conc. HNO3 and hydrous ZnCl2 Conc. HCl and hydrous ZnCl2 Conc. HNO3 and anhydrous ZnCl2 Ans: 3. The compound which reacts fastest with Lucas reagent at room temperature is [1989] Butan-1-ol Butan-2-ol 2-Methyl propan-1-ol 2-Methylpropan-2-ol 4. Which one of the following compounds will be most readily attacked by an electrophile? [1989] Chlorobenzene Benzene Phenol Toluene 5. Propene, CH3CHCH2 can be converted into 1- propanol by oxidation. Indicate which set of reagents amongst the following is ideal to effect the above conversion? [1989] KMnO4 (alkaline) Osmium tetraoxide (OsO4 /CH2Cl2) B6H6 and alk. H2O2 O3 /Zn 6. When phenol is heated with CHCl3 and alcoholic KOH when salicyl adehyde is produced. This reaction is known as [1988, 89] Rosenmund s reaction Reimer-Tiemann reaction Friedel-Crafts reaction Sommelet reaction 7. How many isomers of C5H11 OH will be primary alcohols? [1992] Methanol is industrially prepared by [1992] Oxidation of CH4 by steam at 900 C Reduction of HCHOusing LiAIH4 Reaction HCHOwith a solution of NaOH Reduction of COusing H2 and ZnO Cr2O3. 9. HBr reacts fastest with [1992] 2-Mehtylpropan-1-ol 2-Methylpropene-2-ol propan-2-ol propan-1-ol. 10. When phenol is treated with excess bromine water. It gives [1992] m-bromophenol o-and p-bromophenols 2,4-Dibromophenol 2,4, 6-Tribomophenol. 11. Ethanol and dimethyl ether form a pair of functional isomers. The boiling point of ethanol is higher than that of dimethyl ether, due to the presence of [1993] H-bonding in ethanol H-bonding in dimethyl ether CH3 group in ethanol CH3 group in dimethyl ether Ans: 12. Increasing order of acid strength among p- methoxyphenol, p-methylphenol and p- nitrophenol is [1993] p-nitrophenol, p-methoxyphenol, p- Methylphenol p-methylphenol, p-methoxyphenol, p- Nitrophenol p-nitrophenol, p-methylphenol, p- Methoxyphenol. p-methoxyphenol, p-methylphenol, p- Nitrophenol

2 Which one of the following on oxidation gives a ketone? [1993] Primary alcohol secondary alcohol tertiary alcohol All of these 14. What is formed when a primary alcohol undergoes catalytic dehydrogenation? [1993] Aldehyde Ketone Alkene Acid Ans: 15. The stablest among the following is [1994] CH3CH(OH) 2 ClCH2CH(OH) 2 (CH3) 2 C(OH) 2 CCl3 CH(OH) Phenylethanol can be prepared by the reaction of benzaldehyde with [1997] ethyl iodide and magnesium methyl iodide and magnesium methyl bromide and aluminium bromide methyl bromide 17. [1998] RCHOHR RCHOHCH3 RCH2CH2OH CHCHOH2 18. The ionization constant of phenol is higher than that of ethanol because: [2000] phenoxide ion is bulkier than thoxide phenoxide ion is stronger base than ethoxide phenoxide ion is stabilized through delocalization phenoxide ion is less stable than ethoxide 19. Propan - 1- ol may be prepared by the reaction of propene with [2000] 20. Which of the following is correct? [2001] On reduction of any aldehyde, secondary alcohol is formed Reaction of vegetable oil with H 2 SO4 gives glycerine Sucrose on reaction with NaCl gives invert sugar Alcoholic iodine gives iodoform with NaOH 21. n-propyl alcohol and isopropyl alcohol can be chemically distinguished by which reagent? [2002] PCl5 Reduction Oxidation with potassium dichromate Ozonolysis 22. When phenol is treated with CHCl3 and NaOH, the product formed is [2002] Benzaldehyde Salicylaldehyde Salicylic acid Benzoic acid 23. Which of the following will not form a yellow precipitate on heating with an alkaline solution of iodine? [2004] CH3CH(OH) CH3 CH3CH2CH(OH) CH3 CH3OH CH3CH2OH 24. The major organic product in the reaction, CH3 O CH(CH3) 2 + HI Product is [2006] ICH2OCH(CH3) 2 CH3OC(CH3) 2 CH3I+ (CH3) 2CHOH CH3OH+ (CH3) 2CHI 25. Ethylene oxide when treated with Grignard reagent yields [2006] tertiary alcohol cyclopropyl alcohol

3 223 primary alcohol secondary alcohol [2009] benzaldehyde benzoic acid benzene toluene 30. Which one of the following compounds has the most acidic nature? [2010] 27. [2009] CH3CH2 O CH2 CH3 CH3 CH2 O SO3H CH3CH2OH CH2 = CH2 28. H2COH CH2OH on heating with periodic acid gives: [2009] 31. Among the following four compounds phenol (ii) methylphenol (iii) meta-nitrophenol (iv) para-nitrophenol the acidity order is: [2010] ii > i > iii > iv iv > iii > i > ii iii > iv > i > ii i > iv > iii > ii 32. When glycerol is treated with excess of HI, it produces: [2010] glycerol triiodide 2 iodopropane

4 224 allyl iodide propene 33. [2012] Acetone Methane Acetaldehyde Ethyl alcohol 34. Which of the following compounds can be used as antifreeze in automobile radiators? [2012 M] Methyl alcohol Glycol Nitrophenol Ethyl alcohol 35. Among the following ethers, which one will produce methyl alcohol on treatment with hot concentrated HI? [NEET2013] Phenol is distilled with Zn dust followed by Friedel Crafts alkylation with propyl chloride in the presence of AlCl3 to give a compound. is oxidised in the presence of air to form the compound. The structural formula of is [NEETKar. 2013] 4. 5.

5

6

7

8