970 + Interview Questions in ALCOHOLS IN GENERAL AWARENESS Page 20 InterviewSolution

951.	Diethyl ether is used as :(a) a hypnotic (b) an antiseptic (c) an anaesthetic (d) an antipyretic
Answer» Option : (c) an anaesthetic

Discussion

952.	To obtain fuel, diethyl ether is mixed with : (a) ester (b) ethanal (c) ethanol (d) 2-propanone
Answer» Option : (c) ethanol

Discussion

953.	Which of the following compounds when heated with CO at 423K and 500 atm. Pressure in presence of `BF_(3)` forms ethyl propionate ?A. `C_(2)H_(5)OH`B. `CH_(3)-O-CH_(3)`C. `CH_(3)-O-C_(2)H_(5)`D. `C_(2)H_(5)-O-C_(2)H_(5)`
Answer» Correct Answer - D

Discussion

954.	Carbon-oxygen double bond are easily reduced by `NaBH_(4)` or `LiAlH_(4)`. The actual reducing agent in these reduction is hydride ion `(H^(-))`. The metal-hydrogen bond in `LiAlH_(4)` is more polar than metal-hydrogen bond in `NaBH_(4)`. As a result `LiAlH_(4)` is strong reducing agent than `NaBH_(4)`. Esters, carboxylic acids, amides cannot be reducted by `NaBH_(4)`. The carbonyl group of amide to methylene group by `LiAlH_(4)`. Find the correct product of the following reaction `:` A. B. C. D. No reaction
Answer» Correct Answer - C

Discussion

955.	Neutral `FeCl_(3)` gives purple colour with `:`A. only phenolB. only salicyclic acidC. both phenol and salicylic acidD. only benzoic acid
Answer» Correct Answer - C

Discussion

956.	Consider the following compounds Among the compounds A and B, the vapour pressure of B at a particular temperature isA. higher than that of AB. lower than that of AC. same as that of AD. None of the above
Answer» Correct Answer - A In o-nitrophenol, Intramolecular H-bonding is present between `-OH` and `-NO_(2)` groups, whereas p-nitrophenol forms intermolecular H-bonding. Thus, vapour pressure of B is higher than that of A.

Discussion

957.	Identify A and B in the following reaction `C_(2)H_(5) - Cl overset(A)rarr C_(2)H_(5) OH overset(B)leftarrow C_(2)H_(5)Cl`A. A = aqueous KOH, B = moist `Ag_(2)O`B. A = alcoholic KOH, B = aqueous NaOHC. A = aqueous NaOH, B `= AgNO_(2)`D. `A = AgNO_(2), B = KNO_(2)`
Answer» Correct Answer - A

Discussion

958.	`C_(6)H_(5)Ohoverset(CH_(3)COCl)underset(NaOH(aq))(rarr)C_(6)H_(5)OCOCH_(3)` the above reaction is an example ofA. Reimer-Tiemann reactionB. Schotten-Baumann reactionC. AcetylationD. Benzoylation
Answer» Correct Answer - C

Discussion

959.	When `FeCl_(3)` is added to phenol `:`A. a coloured complex is formedB. `Fe^(+)` will be oxidised to higher stateC. o-chloro phenol will be formedD. no reaction occurs
Answer» Correct Answer - A

Discussion

960.	Consider the following reaction, The electrophile involved in the above reaction isA. dichloromethyl cation, `overset(+)(C)HCl_(2)`B. formyl cation, `overset(+)(C)HO`C. trichloromethyl anion, `bar(C)Cl_(3)`D. dichlorocarbene, : `C Cl_(2)`
Answer» Correct Answer - D `CHCl_(3)+bar(O)H rarr underset(("Unstable"))(bar(C)Cl_(3))+H_(2)O` `bar(C)Cl_(3)rarr: underset(underset(("electrophile"))("Dichlorocarbene"))(C Cl_(2))+Cl^(-)`

Discussion

961.	`C_(6)H_(5)OH+CHCl_(3)+NaOH rarr` salicyladehyde The electrophile involved in the above reaction is.A. dichloromethyl cation `(overset(o+)(C)HCl_(2))`B. dichlorocarbene `( :C Cl_(2))`C. trichloromethyl anion `(bar(C)Cl_(3))`D. formly cation `(overset(o+)(C)HO)`
Answer» Correct Answer - B

Discussion

962.	The electrophile involved in the above reaction is:A. DichloroMethyl cation `(Coverset(o+)HCI_(2))`B. Dichlorocarbene (`:C CI_(2))`C. TrichloroMethyl anion `(overset(Theta)C CI_(3))`D. Formy`1` cation `(overset(o+)CHO)`
Answer» Correct Answer - B The Riemer-Tiemann reaction is followed by dichlorocarbene mechansium.

Discussion

963.	The electrophile involved in the Reimer-Tiemann reaction isA. dichloromethyl cation, `overset(+)CHCl_(2)`B. formyl cation `overset(+)CHO`C. trichloromethyl anion, `overset(-)C Cl_(3)`D. dichloro carbene : `"CCl"_(2)`
Answer» Correct Answer - D In Reimer-Tiemann reaction the electrophile involved is dichlorocarbene, `:"CCl"_(2).` `CHCl_(3)+OH^(Theta)rarr underset("(Unstable)")(.^(Theta)"CCl"_(3))+H_(2)O` `.^(Theta)"CCl"_(3)rarr underset("Dichlorocarbene")(":CCl"_(2))+Cl^(-)`

Discussion

964.	The reaction, `C_(6)H_(5)ONa +CO_(2)+H_(2)O rarr C_(6)H_(5)OH+NaHCO_(3)` suggests that `:`A. Phenol is a stronger acid than carbonic acidB. Carbonic acid is stronger acid than phenolC. Water is stronger acid than phenolD. None of the above
Answer» Correct Answer - B

Discussion

965.	The reaction `CH_(3)-underset(CH_(3))underset(\|)overset(CH_(3))overset(\|)(C )-ONa+CH_(3)CH_(2)ClrarrCH_(3)-underset(CH_(3))underset(\|)overset(CH_(3))overset(\|)(C )-O-CH_(2)-CH_(3)` is calledA. Etard reactionB. Gattermann-Koch reactionC. Williamson continuous etherification processD. Williamsonsynthesis
Answer» Correct Answer - D

Discussion

966.	Two aromatic compounds having formula `C_(7)H_(8) O` which are easily identified by `FeCl_(3)` solution test (violet colouration ) are `,`A. methyl phenyl ehter and benzyl alcoholB. o-cresol and p-cresolC. m-cresol and p-cresolD. o-cresol and benzyl alcohol
Answer» Correct Answer - D

Discussion

967.	The electrophile involved in the above reaction is:A. dichloromethyl cation `(overset(o+)(C)HCl_(2))`B. dichlorocarbene `( :C C l_(2))`C. trichloromethyl anion `( overset(o-)(C) Cl_(3))`D. formyl cation `( overset(o+)(C)HO)`
Answer» Correct Answer - B

Discussion

968.	The reaction, `C_(6)H_(5)ONa +CO_(2)+H_(2)O rarr C_(6)H_(5)OH+NaHCO_(3)` suggests that `:`A. phenol is stronger acid than carbonic acidB. carbonic acid is a stronger acid than phenolC. water is a stronger acid than phenolD. none of the above
Answer» Correct Answer - B

Discussion

969.	Phenol can be distinguished from ethanol by the following reagents exceptA. sodiumB. `NaOH//l_(2)`C. neutral `FeCl_(3)`D. `Br_(3)//H_(2)O`
Answer» Correct Answer - A Phenol cannot be distinguished from ethanol by sodium because both evolve hydrogen with sodium. `2C_(6)H_(5)OH+2Na rarr 2C_(6)H_(5)overset(-)Ooverset(+)Na+H_(2) uarr` `2C_(2)H_(5)OH+2Na rarr 2C_(2)H_(5)overset(-)O overset(+)Na+H_(2) uarr`

Discussion

970.	Phenol can be distinguished from ethanol by the following reagents exceptA. sodiumB. `NaOH //I_(2)`C. Neutral `FeCl_(3)`D. `Br_(2)//H_(2)O`
Answer» Correct Answer - A

Discussion

Explore topic-wise InterviewSolutions in .

Diethyl ether is used as :(a) a hypnotic (b) an antiseptic (c) an anaesthetic (d) an antipyretic

To obtain fuel, diethyl ether is mixed with : (a) ester (b) ethanal (c) ethanol (d) 2-propanone

Which of the following compounds when heated with CO at 423K and 500 atm. Pressure in presence of `BF_(3)` forms ethyl propionate ?A. `C_(2)H_(5)OH`B. `CH_(3)-O-CH_(3)`C. `CH_(3)-O-C_(2)H_(5)`D. `C_(2)H_(5)-O-C_(2)H_(5)`

Neutral `FeCl_(3)` gives purple colour with `:`A. only phenolB. only salicyclic acidC. both phenol and salicylic acidD. only benzoic acid

Consider the following compounds Among the compounds A and B, the vapour pressure of B at a particular temperature isA. higher than that of AB. lower than that of AC. same as that of AD. None of the above

Identify A and B in the following reaction `C_(2)H_(5) - Cl overset(A)rarr C_(2)H_(5) OH overset(B)leftarrow C_(2)H_(5)Cl`A. A = aqueous KOH, B = moist `Ag_(2)O`B. A = alcoholic KOH, B = aqueous NaOHC. A = aqueous NaOH, B `= AgNO_(2)`D. `A = AgNO_(2), B = KNO_(2)`

`C_(6)H_(5)Ohoverset(CH_(3)COCl)underset(NaOH(aq))(rarr)C_(6)H_(5)OCOCH_(3)` the above reaction is an example ofA. Reimer-Tiemann reactionB. Schotten-Baumann reactionC. AcetylationD. Benzoylation

When `FeCl_(3)` is added to phenol `:`A. a coloured complex is formedB. `Fe^(+)` will be oxidised to higher stateC. o-chloro phenol will be formedD. no reaction occurs

Consider the following reaction, The electrophile involved in the above reaction isA. dichloromethyl cation, `overset(+)(C)HCl_(2)`B. formyl cation, `overset(+)(C)HO`C. trichloromethyl anion, `bar(C)Cl_(3)`D. dichlorocarbene, : `C Cl_(2)`

`C_(6)H_(5)OH+CHCl_(3)+NaOH rarr` salicyladehyde The electrophile involved in the above reaction is.A. dichloromethyl cation `(overset(o+)(C)HCl_(2))`B. dichlorocarbene `( :C Cl_(2))`C. trichloromethyl anion `(bar(C)Cl_(3))`D. formly cation `(overset(o+)(C)HO)`

The electrophile involved in the above reaction is:A. DichloroMethyl cation `(Coverset(o+)HCI_(2))`B. Dichlorocarbene (`:C CI_(2))`C. TrichloroMethyl anion `(overset(Theta)C CI_(3))`D. Formy`1` cation `(overset(o+)CHO)`

The electrophile involved in the Reimer-Tiemann reaction isA. dichloromethyl cation, `overset(+)CHCl_(2)`B. formyl cation `overset(+)CHO`C. trichloromethyl anion, `overset(-)C Cl_(3)`D. dichloro carbene : `"CCl"_(2)`

The reaction, `C_(6)H_(5)ONa +CO_(2)+H_(2)O rarr C_(6)H_(5)OH+NaHCO_(3)` suggests that `:`A. Phenol is a stronger acid than carbonic acidB. Carbonic acid is stronger acid than phenolC. Water is stronger acid than phenolD. None of the above

Two aromatic compounds having formula `C_(7)H_(8) O` which are easily identified by `FeCl_(3)` solution test (violet colouration ) are `,`A. methyl phenyl ehter and benzyl alcoholB. o-cresol and p-cresolC. m-cresol and p-cresolD. o-cresol and benzyl alcohol

The electrophile involved in the above reaction is:A. dichloromethyl cation `(overset(o+)(C)HCl_(2))`B. dichlorocarbene `( :C C l_(2))`C. trichloromethyl anion `( overset(o-)(C) Cl_(3))`D. formyl cation `( overset(o+)(C)HO)`

The reaction, `C_(6)H_(5)ONa +CO_(2)+H_(2)O rarr C_(6)H_(5)OH+NaHCO_(3)` suggests that `:`A. phenol is stronger acid than carbonic acidB. carbonic acid is a stronger acid than phenolC. water is a stronger acid than phenolD. none of the above

Phenol can be distinguished from ethanol by the following reagents exceptA. sodiumB. `NaOH//l_(2)`C. neutral `FeCl_(3)`D. `Br_(3)//H_(2)O`

Phenol can be distinguished from ethanol by the following reagents exceptA. sodiumB. `NaOH //I_(2)`C. Neutral `FeCl_(3)`D. `Br_(2)//H_(2)O`