2. An aldehyde can be obtained by the dehydrogenation of an alcohol. The catalyst used in the reaction is
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1 Class: 12 Subject: Chemistry Topic: Organic Chemistry of O compounds No. of Questions: 20 Duration: 60 Min Maximum Marks: Rectified spirit is converted to absolute alcohol taking advantage of the fact that benzene - alcohol - water is a ternary azeotropic mixture, benzene -, alcohol is a binary azeotropic mixture and the boiling points of the two mixtures stand in relation to the boiling point of alcohol in the following descending order A. alcohol, ternary mixture, binary mixture B. alcohol, binary mixture, ternary mixture C. binary mixture, alcohol, ternary mixture D. ternary mixture, binary mixture, alcohol Boiling point of the ternary mixture being lowest, it distills out first. The binary mixture of benzene and alcohol having intermediate boiling point distills next. Alcohol with the highest boiling is left over 2. An aldehyde can be obtained by the dehydrogenation of an alcohol. The catalyst used in the reaction is A. conc. H 2 SO 4 B. copper C. nickel D. Pd Conc. H 2 SO 4 is a dehydrating agent, depending on the conditions either alkene or an ether is the product. Ni and Pd act as reducing catalyst. Hence the dehydrogenating catalyst, Cu is chosen 3. Which one of the following is the weakest acid? A. Phenol B. p-cresol C. p-chlorophenol D. p-nitrophenol
2 CH 3 - group. of cresols being electron donor in character, increases the electron density around the phenolic group. Hence the process of protonation becomes more difficult than phenol. Hence cresol is a weaker acid than phenol. In chloro and nitrophenols the - Cl and -NO 2 group are electron withdrawing group. Hence they increase the acidity of phenol. Hence they are stronger acids than phenol. Hence option 2 is the correct choice 4. The reagent with which both acetaldehyde and acetone readily react is A. Tollen's reagent B. Schiff's reagent C. Fehling's solution D. Grignard reagent Grignard reagents react with both aldehydes and ketones to give the addition products which on hydrolysis give alcohols 5. The hydrogen atom of the phenolic group can be displaced A. only by using metallic sodium B. by using either metallic sodium or sodium hydroxide C. by using sodium carbonate D. by using sodium chloride Ans. C
3 A. CH 4 B. CH 3 OH C. CH 3 CN D. CH 3 CONH 2 7. Which of the following reagents cannot be used to differentiate phenol and ethanol? A. Neutral FeCL 3 B. Na metal C. Bromination D. L 2 snf NaOH Solution : Detailed Answer:: Neutral ferric chloride test and bromination tests are answered only by phenol while ido form test (I 2 and NaOH) is answered only byethanol. Na metal test is answered by both phenol and ethanol. Hence cannot be used 8. When mixture of ethyl alcohol vapour and air is passed over silver or copper catalyst maintained at ºC, which one of the following compounds is produced? Ans. A A. CH 3 CHO B. CH 3 COOH C. CH 2 = CH 2 D. d.c 2 H 5 O C 2 H 5 9. A. amide B. amine C. acid D. ester
4 Ans. C 10. When a strong aqueous solution of sodium acetate is electrolysed, the gas liberated at the anode is A. methane B. ethane C. hydrogen D. carbon dioxide CH 3 COONa CH 3 COO - + Na.At the cathode hydrogen is evolved. At the anode CH 3 COO - ions get discharged as (CH 3 COO) groups. These do not have free existence. Hence 2 such radicals jointly decompose giving ethane and carbon dioxide. 2CH 3 COO - C 2 + 2CO 2. This reaction is called Kolbe s reaction 11. Which one of the following is used as a food preservative? A. Acetic acid B. Acetyl salicylic acid C. Salol D. Sodium benzoate 12. A tertiary alcohol is represented by the general formula A. RCH 2 OH B. R 2 CHOH C. R 3 COH D. none of these Ans.c 13. Denatured alcohol is A. rectified spirit B. undistilled ethanol C. rectified spirit + methanol + naphtha D. 50% ethanol + 50% methanol Ans. C
5 14. Which of the following decolourises KMnO 4? A. HCOOH B. CH 3 NH 2 C. C6H5NH2 D. CH3COOCH3 ans. A solution: The aldehyde group of formic acid gets oxidised with acidified KMnO 4 Hence pink colour is discharged 15. Which of the following is not a monohydric alcohol? A. benzyl alcohol B. glycerol C. isopropyl alcohol D. ethanol solution:: Glycerol contains three - OH groups in a molecule of it. So it is a tri hydric alcohol. All the rest containing one - OH in a molecule aremonohydric alcohols 16. Heating a mixture of calcium formate and calcium acetate producess A. acetone B. ethyl alcohol C. ethane D. acetaldehyde (CH 3 COO) 2 Ca + (HCOO) 2 Ca 2CH 3 CHO + 2CaCO3.Calcium acetate gives the CH 3 - and calcium formate give the aldehyde group.thus the product formed is acetaldehyde (CH 3 CHO).A mixed ketone is one where two different groups are attached to C = O group 17. Carbolic acid is A. formic acid B. acetic acid C. salicylic acid D. phenol 18. Isopropyl alcohol on passing over heated copper at 300 C gives A. propylene B. acetaldehyde C. acetone D. propane
6 Ans. C Solution : 19. Benzaldehyde is obtained by oxidation of toluene using A. acidified potassium dichromate B. chromyl chloride C. acidified potassium permanganate D. alkaline potassium permanganate Ans:: B 20. Tollen's reagent contains A. [AG(NH 3 ) 2 ] + ions B. [CU(OH) 4 ] 2- C. Ag 2 O D. Cu 2 o ans. A solution: A To prepare Tollen s reagent silver nitrate is treated with NaOH to get a brown precipitate of silver oxide which is dissolved in ammonia to get [Ag(NH 3 ) 2 ]+ ions
Class: 12 Subject: chemistry Topic: Organic Chemistry of O compounds No. of Questions: 20 Duration: 60 Min Maximum Marks: 60
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