InterviewSolution
Saved Bookmarks
InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Absolute ethyl alcohol can be converted to diethyl ether by heating it to 410 K in the presence ofA. Dil. `H_(2)SO_(4)`B. Dil. HClC. Conc. `H_(2)SO_(4)`D. Conc. `CH_(3)COOH` |
|
Answer» Correct Answer - C `2CH_(3)CH_(2)OH underset(410K)overset(Conc. H_(2)SO_(4))rarr C_(2)H_(5)-O-C_(2)H_(5)+H_(2)O` |
|
| 52. |
Predict the products of the following reactions : (i) `CH_(3)-CH=CH_(2) underset((ii) 3H_(2)O_(2)//OH^(-))overset((i) B_(2)H_(6))(rarr)` (ii) `C_(6)H_(5)-OH overset(Br_(2) (aq))(rarr)` (iii) `CH_(3) -CH_(2)-OH overset(Cu//573 K)(rarr)` |
|
Answer» (i) `underset("Propene")(CH_(3)-CH=CH_(2)) underset((ii) 3H_(2)O_(2)//OH^(-))overset((i) B_(2)H_(6))(rarr) underset("Propan-1-ol")(CH_(3)-CH_(2)-CH_(2)OH)` (ii) `underset("Phenol")(C_(6)H_(5)-OH) overset(Br_(2) (aq))(rarr) underset("Tribromophenol")(C_(6)H_(2)(Br_(3))OH)` (iii) `underset("Ethanol")(CH_(3)-CH_(2)-OH) overset(Cu//573 K)(rarr) underset("Ethene")(CH_(2)=CH_(2))` |
|
| 53. |
`C_(6)H_(5)OH underset(NaOH(aq.))overset(ClCOCH_(3))rarrC_(6)H_(5)OCOCH_(3)` The above reaction is an exampleA. Reimer Teimann reactionB. Schotten Baumann ReactionC. AcetylationD. Benzoylation |
|
Answer» Correct Answer - C Acetylation |
|
| 54. |
The final product Y in the following reaction is `CH_(3)CH_(2)CH=CH_(2) underset((C_(6)H_(5)CO_(2))_(2))overset(NBS, hv)rarrX underset(CH_(3)OH)overset(CH_(3)SNa)rarrY`A. Diallyl sulphideB. Allyl methyl sulphideC. n-Butyl methyl sulphideD. Methyl methyl-1-allyl sulphide. |
|
Answer» Correct Answer - D `{:(CH_(3)CH_(2)CH=CH_(2)underset((C_(6)H_(5)CO_(2))_(2))overset(NBS, hv)rarrCH_(3)-CH-CH=CH_(2)underset(CH_(3)OH)overset(CH_(3)SNa)rarr CH_(3)-CH-CH=CH_(2)),(" |"" | "),(" "Br " " S-CH_(3)),( " X Methyl methyl-1-allyl sulphide(Y)"):}` |
|
| 55. |
n-Propyl alcohol on treatment with excess hot conc. `H_(2)SO_(4)` gives compounds X. X on treatment with `HBr` in the presence of benzoyl peroxide give Y. Y when dissolved in ether and treated with sodium givesA. n-HexaneB. 2-MethylpentaneC. 2,3-DimethylbutaneD. 3-Methylpentane |
|
Answer» Correct Answer - A `underset("n-Propyl alcohol")(CH_(3)CH_(2)CH_(2)OH)overset(Conc.H_(2)SO_(4))rarr CH_(3)CH=CH_(2) underset("Peroxide")overset(HBr)rarrCH_(3)CH_(2)CH_(2)Br underset("ether")overset(Na)rarrunderset("n-Hexane")(CH_(3)CH_(2))CH_(2)CH_(2)CH_(2)CH_(3)` |
|
| 56. |
An aldehyde can not be reduced to a primary alcohol byA. `NaBH_(4)`B. `Ni//H_(2)`C. `Zn-Hg//HCl`D. `LiAlH_(4)` |
|
Answer» Correct Answer - C Zn-Hg/HCl reduces aldehydes and ketones to hydrocarbons. |
|
| 57. |
Which one of the following is a better reducing agent for the following reduction. `RCOOH rarr RCH_(2)OH`A. `SnCl_(2)//HCl`B. `NaBH_(4)`/etherC. `H_(2)//Pd`D. `N_(2)H_(4)//C_(2)H_(5)ONa` |
| Answer» Correct Answer - A | |
| 58. |
Scientific study of fermentation was first made byA. BuchnerB. LiebigC. BiotD. Pasteur |
|
Answer» Correct Answer - A Pasteur. |
|
| 59. |
Primary alcohol can best changed to aldehyde by using the reagentA. pyridinium chlorochromateB. potassium dichromateC. potassium permanganateD. hydrogen peroxide |
|
Answer» Correct Answer - A A primary alcohol first gets oxidised to an aldehyde which is further oxidised to an acid. The reaction can be stopped at aldehyde stage by using pyridinium chlorochromate `(C_(5)H_(5)NH^(+)CrO_(3)Cl^(-))`. |
|
| 60. |
The reaction of with HBr gives predominantlyA. B. C. D. |
| Answer» Correct Answer - A | |
| 61. |
Most favourable condition for the alcoholic fermentation of sugar isA. High concentration of solution, low temperature, plenty of air supplyB. Low concentration of sugar solution, moderate temperature, absence of airC. Low concentration of sugar solution, low temperature, plenty of airD. None |
| Answer» Correct Answer - B | |
| 62. |
In fermentation by zymase, ethyl alcohol and carbon dioxide are produced from which of the following sugars?A. GlucoseB. Invert sugarC. FructoseD. All of these |
|
Answer» Correct Answer - D Glucose + Fructose/Invert sugar `overset("Zymase")rarr C_(2)H_(5)OH+CO_(2)`. |
|
| 63. |
Fermentation is anA. EndothermicB. ExothermicC. Reversible ReactionD. None |
|
Answer» Correct Answer - B Exothermic Reaction. |
|
| 64. |
The most suitable reagent for the conversion of `RCH_(2)OH rarr RCHO` isA. `KMnO_(4)`B. `K_(2)Cr_(2)O_(7)`C. `CrO_(3)`D. PCC (pyridine chloro chromate) |
| Answer» Correct Answer - D | |
| 65. |
Argol a brown crust formed during the fermentation of grape juice containsA. `CO_(2)`B. Fusel oilC. Potassium hydrogen tartarateD. Lye |
|
Answer» Correct Answer - C Potassium hydrogen tartarate. |
|
| 66. |
The most suitable reagent for the conversion of primary alcohol into aldehyde with the same number of carbon atom isA. acidified `K_(2)Cr_(2)O_(7)`B. acidified `KMnO_(4)`C. alkaline `KMnO_(4)`D. pyridinium `KMnO_(4)` |
| Answer» Correct Answer - D | |
| 67. |
The factor which adversely affects the fermentation process isA. low conc. of sugarB. high conc. of sugarC. presence of airD. presence of ammonium sulphate |
|
Answer» Correct Answer - B Low conc. of sugar favours the fermentation process. |
|
| 68. |
Blasting galetin is prepared by mixing nitro-gylcerine withA. saw dust and ammonium nitrateB. cellulose nitrateC. saw dust aloneD. concentrated sulphuric acid |
| Answer» Correct Answer - B | |
| 69. |
In gylcerine,A. One primary `-OH` group is present onlyB. One tertiary `-OH` group is presentC. Two secondary `-OH` groups are presentD. One secondary `-OH` group is present |
| Answer» Correct Answer - D | |
| 70. |
When wine is put in air, it becomes sour due toA. BacteriaB. Oxidation of `C_(2)H_(5)OH` in to `CH_(3)COOH`C. VirusD. Formic acid formation |
| Answer» Correct Answer - B | |
| 71. |
Which of the following will give charcteristic colour with ferric chloride.A. Allyl alcoholB. Benzyl alcoholC. PhenolD. Vinyl alcohol |
|
Answer» Correct Answer - C::D Phenol any vinyl alcohol `(CH_(2)=CH-OH)` give characteristic colours with `FeCl_(3)` solution. |
|
| 72. |
Which of the following will dissolve in aqueous `Na_(2)CO_(3)` ?A. PhenolB. 2,4,6-TrimethylphenolC. 2,4,6-TrinitrophenolD. 2,4-Dinitrophenol |
|
Answer» Correct Answer - C::D Phenol is less acidic than `H_(2)CO_(3)`. As such phenol does not dissolve in aqueous `Na_(2)CO_(3)`. However, presence of electron withdrawing group `(-NO_(2))` makes it more acidic. Thus 2, 4-dinitrophenol and 2,4,6-trinitrophenol are more acidic than `H_(2)CO_(3)` and as such dissolve in `Na_(2)CO_(3)` to diaplce weaker acid `H_(2)CO_(3)`. |
|
| 73. |
The enzyme which can catalyse the conversion of glucose to ethanol isA. ZymaseB. InvertaseC. MaltaseD. Diastase |
|
Answer» Correct Answer - A Zymase |
|
| 74. |
Assertion: `o-`and `p`-nitrophenol can be separated by steam distillation. Reason: `o-`nitrophenols have intramolecular hydorgen bonding while `p`-nitrophenols exists as associated molecules.A. If both assertion and reason are correct and reason is correct explanation for assertion.B. If both assertion and reason are correct but reason is not correct explanation for assertion.C. If assertion is correct but reason is incorrect.D. If assertion and reason both are incorrect. |
|
Answer» Correct Answer - C Correct reason : Boiling point of ortho nitrophenol is less than that of para nitrophenol. |
|
| 75. |
Identify the binary mixture(s) that can be separated into individual compounds by differential extraction, as shown in the given scheme. A. `C_(6)H_(5)OH` and `C_(6)H_(5)COOH`B. `C_(6)H_(5)COOH` and `C_(6)H_(5)CH_(2)OH`C. `C_(6)H_(5)CH_(@)OH` and `C_(6)H_(5)OH`D. `C_(6)H_(5)CH_(2)OH` and `C_(6)H_(5)CH_(2)COOH`. |
|
Answer» Correct Answer - B::D (a) `C_(6)H_(5)OH` and `C_(6)H_(5)COOH` cannot be separated by `NaOH (aq)`. Therefore, this option is not possible. (b) `C_(6)H_(5)COOH` reacts with both `NaOH (aq)` and `NaHCO_(3) (aq)` whereas `C_(6)H_(5)CH_(2)OH` does not. This option is possible. (c) `C_(6)H_(5)CH_(2)OH` and `C_(6)H_(5)OH` both do not react with `NaHCO_(3) (aq)`. therefore, this option is not possible. (d) `C_(6)H_(5)CH_(2)COOH` reacts with both `NaHCO_(3) (aq)` and `NaOH (aq)` whereas `C_(6)H_(5)CH_(2)OH` does not. Therefore, this option is possible. |
|
| 76. |
Which of the following alcohols on dehydration with conc. `H_(2)SO_(4)` will yield But-2-ene ?A. 2-Methyl-2-butanolB. 2-PropanolC. 2-Methyl-2-propanolD. sec. Butyl alcohol |
|
Answer» Correct Answer - D `underset("sec-Butyl alcohol")(H_(3)- underset(OH)underset(|)(CH)-CH_(2)_CH_(3)) underset(-H_(2)O)overset(conc. H_(2)SO_(4))rarr underset("But-2-ene")(H_(3)C-CH=CH-CH_(3))` |
|
| 77. |
Assertion (A) : The dehydration of alcohols by conc. `H_(2)SO_(4)` involves the formation of carbocation. Reason (R) : The protonated alcohol molecule loses water molecule in the second step.A. Both A and R are true and R is the correct explanation of A.B. Both A and R are true and R is not a correct explanation of A.C. A is true but R is false.D. A is false but R is true. |
| Answer» Correct Answer - A | |
| 78. |
`A underset(H_(2)SO_(4))overset(K_(2)Cr_(2)O_(7))rarr Bunderset("Vigorous oxidation")overset([O])rarr CH_(3)COOH` If B in the given sequence is propanone, then A is:A. Ethyl alcoholB. Isopropyl alcoholC. Propyl alcoholD. tert-Pentyl alcohol |
|
Answer» Correct Answer - B `H_(3)C-underset((A))underset(OH)underset(|)(CH)-CH_(3)underset(H_(2)SO_(4))overset(K_(2)Cr_(2)O_(7))rarrH_(3)C-underset((B))underset(O)underset(||)(C)-CH_(3) underset(underset("oxidin")("Vigorous"))overset([O])rarrH_(3)C COOH` |
|
| 79. |
In the reaction the intermediate(s) is/are:A. B. C. D. |
|
Answer» Correct Answer - A::C Oxygen atom in phenoxide ion is activation in nature. It activates the ortho and para positions in the ring. As a result, both (a) and (c) can be formed. |
|
| 80. |
(I) 1,2-Dihydroxy benzene (II) 1,3-Dihydroxy benzene (III) 1,4-Dihydroxy benzene (IV) Hydroxy benzene The increasing order of boiling points of the above-mentioned alcohols is:A. `I lt II lt III lt IV`B. `I lt II lt IV lt III`C. `IV lt I lt II lt III`D. `IV lt II lt I lt III` |
|
Answer» Correct Answer - C The `OH` groups are involved in intermolecular H-bonding which influence the boiling points of the compounds. Based upon that, the correct order of boiling points is as given. |
|
| 81. |
Compounds which are used for the denaturation of alcohols are :A. NaphthaB. `CH_(3)OH`C. PyridineD. Anhyd. `CaCl_(2)` |
|
Answer» Correct Answer - B::C Both methyl alcohol and pyridine can cause denaturation of alcohols. |
|
| 82. |
Phenyl acetate on heating with anhy. `AlCl_(3)` givesA. o & p-HydroxyacetophenoneB. m-HydroxyacetophenoneC. Acetophenone onlyD. None of these |
|
Answer» Correct Answer - A Fries rearrangement. |
|
| 83. |
Write structure of phenyl isopentyl ether. Give its IUPAC name. |
| Answer» `C_(6)H_(5)-O-overset(1)(C)H_(2)-overset(2)(C)H_(2)-underset(CH_(3))underset(|)(overset(3)CH)-overset(4)(C)H_(3)` : 3-Methyl-1-phenoxybutane | |
| 84. |
Which one of the following when dissolved in water, gives a solution with pH less than seven at 298 K ?A. `CH_(3)COCH_(3)`B. `C_(6)H_(5)OH`C. `C_(6)H_(5)NH_(2)`D. `C_(2)H_(5)OH` |
|
Answer» Correct Answer - B `C_(6)H_(5)OH` |
|
| 85. |
Assertion : In acidic medium, phenolphthalein has a benzenoid structure while in basic medium, it has quinoid structure. Reason : Phenols donot react with phosphrous halids while alcohols do react.A. If both assertion and reason are correct and reason is correct explanation for assertion.B. If both assertion and reason are correct but reason is not correct explanation for assertion.C. If assertion is correct but reason is incorrect.D. If assertion and reason both are incorrect. |
|
Answer» Correct Answer - A Reason is the correct explanation for assertion. |
|
| 86. |
Assertion: Benzenediazonium chloride on boiling with water gives phenol. Reason: `C-N` bond is polar.A. If both assertion and reason are correct and reason is correct explanation for assertion.B. If both assertion and reason are correct but reason is not correct explanation for assertion.C. If assertion is correct but reason is incorrect.D. If assertion and reason both are incorrect. |
|
Answer» Correct Answer - B Correct explanation : Benzene diazonium is highlyreactive due to `-N_(2)X^(-)` group attached to the benzene ring. |
|
| 87. |
Which of the following molecules has sufficient `C bar(---)O` double bond character?A. PhenolB. o-CresolC. p-CresolD. all have `C bar(---)O` double bond character. |
|
Answer» Correct Answer - D All have `C bar(......)O` character. |
|
| 88. |
The most unlikely representation of resonance structure of `p`-nitrophenoxide ion is:A. B. C. D. |
|
Answer» Correct Answer - C is the most unstable structure as the N-atom gas five shared pairs of electrons. |
|
| 89. |
Tick the statement which is not true.A. Boiling point of ethanol is greater than that of ethoxyethane due to H-bonding.B. Ethoxyethane is soluble in water due to H-bonding.C. Ethanol is soluble in water due to H-bondingD. Ethoxyethane has nearly same boiling point as that of butanol. |
|
Answer» Correct Answer - D Ethoxyethane has less boiling point temperature than butanol. |
|
| 90. |
Amongst the following phenols which is most acidicA. PhenolB. o-nitrophenolC. p-nitrophenolD. m-nitrophenol |
| Answer» Correct Answer - C | |
| 91. |
Which of the following is a by product of alcohol industryA. ArgolB. `CO_(2)`C. Spent washD. All |
| Answer» Correct Answer - D | |
| 92. |
When phenol is made to react with `PCl_(5)` in presence of pyridine , the resulting product contains.A. `C_(6)H_(5)Cl` onlyB. `(C_(6)H_(5)O)_(3)P=O` onlyC. Both A & BD. None of the above |
| Answer» Correct Answer - C | |
| 93. |
Phenol condenses with formaldehyde in the presence of acid or base to formA. bakeliteB. teflonC. phenolphthaleinD. none of these |
| Answer» Correct Answer - A | |
| 94. |
Which compound is formed when a secondary alcohol is oxidized ? |
|
Answer» A ketone is formed as a result of oxidation. For example, `underset("Isopropyl alcohol")(CH_(3)-underset(OH)underset(|)(CH)-CH_(3)) underset("(oxidation)")overset(CrO_(3))(rarr) underset("Acetone")(CH_(3)-underset(O)underset(||)(C)-CH_(3))` |
|
| 95. |
Power alcohol is a mixture of petrol and alcohol in the ratio odA. `4:1`B. `1:4`C. `2:1`D. `1:2` |
|
Answer» Correct Answer - A `4:1 ((80% + 20%),("Petrol alcohol"))` |
|
| 96. |
Match the List I with List II and select the correct answer using the codes given below the lists : A. P = 3, Q = 4, R = 2, S = 1B. P = 3, Q = 4, R = 1, S = 2C. P = 4, Q = 3, R = 1, S = 2D. P = 2, Q = 3, R = 4, S = 1 |
| Answer» Correct Answer - Code (d) represents the correct answer. | |
| 97. |
Match the List I with List II and select the correct answer using the codes gives below the lists : A. P = 2, Q = 4, R = 1, S = 3B. P = 4, Q = 1, R = 2, S = 3C. P = 1, Q = 2, R = 3, S = 4D. P = 3, Q = 4, R = 1, S = 2 |
| Answer» Correct Answer - Code (d) represents the correct answer. | |
| 98. |
1-Phenylethanol can be prepared by reaction of benzaldehyde withA. Methyl iodide and MagnesiumB. Methyl bromideC. Methyl bromide and `AlBr_(3)`D. `C_(2)H_(5)I` and `Mg` |
|
Answer» Correct Answer - A `C_(6)H_(5)-overset(H)overset(|)(C)=O+CH_(3)MgI rarr C_(6)H_(5)-underset(CH_(3))underset(|)overset(H)overset(|)(C)-OMgI overset(H_(2)O //H^(+))rarr underset("1-Phenylethanol")(C_(6)H_(5)-underset(CH_(3))underset(|)overset(H)overset(|)(C)-OH)` |
|
| 99. |
Conversion of ethyl alcohol into acetaldehyde is an example ofA. ReductionB. Molecular rearrangementC. HydrolysisD. Oxidation |
|
Answer» Correct Answer - D `CH_(3)CH_(2)OH overset([O])rarrCH_(3)CHO+H_(2)O`. |
|
| 100. |
o- nitrophenol is steam volatile while p-nitrophenol is not. Discuss. |
| Answer» o-nitrophenl is more volatile due to the presence of intramolecular hydrogen bonding as compared to p-nitrophenol in which intermolecular hydrogen bonding is present. | |