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. |
Glycerol was distilled with oxalic and crystals and the products were led into fehling solution and warmed . Cuprous oxide was precipitated . It is due toA. COB. HCHOC. `CH_(3)CHO`D. `HCOOH` |
|
Answer» Correct Answer - D `HOOC-COOH underset("Decarboxylation")overset("Glycerol")to HCOOH + CO_(2)` `HCOOH +` Fehlingsolution `to underset("red ppt.")(Cu_(2))O+CO_(2)+H_(2)O` |
|
| 52. |
`(CH_(3))_(3)C-OH` on treatment with NaCl in aqueous medium givesA. No reactionB. `(CH_(3))_(3)C^(-)Na^(+)`C. `(CH_(3))_(3)C^(-)Cl^(-)`D. Isobutylene |
| Answer» Correct Answer - A | |
| 53. |
The compound which is not isomeric with diethyl ether is :A. n-prophylmethyl etherB. Butane-1-olC. 2-methylpropane-2-olD. Butanone |
| Answer» Correct Answer - D | |
| 54. |
Ethylene gylcol gives oxalic acid on oxidation withA. Acidified `K_(2)Cr_(2)O_(7)`B. Acidified `KMnO_(4)`C. Alkaline `KMnO_(4)`D. Periodic acid |
|
Answer» Correct Answer - A Oxalic acid is formed by oxidation of ethylene glycol with acidified potassium dichromate. `{:(CH_(2)OH " "COOH),(|" "+4[O]underset(H_(2)SO_(4))overset(K_(2)Cr_(2)O_(7))to |" "+2H_(2)O),(underset("Ethylene glycol")(CH_(2)OH)" "underset("Oxalic acid")(COOH)):}` |
|
| 55. |
The main product of the following reaction is `C_(6)H_(5)CH_(2)CH(OH)CH(CH_(3))_(2)overset("conc. H_(2)SO_(4))to `A. B. C. D. |
|
Answer» Correct Answer - B `C_(6)H_(5)-CH_(2)-underset(OH)underset(|)CH-overset(CH_(3))overset(|)CH-CH_(3)underset(-H_(2)O)overset("conc." H_(2)SO_(4)(H^(+)))to C_(6)H_(5)-CH_(2)-overset(o+)CH-overset(CH_(3))overset(|)CH-CH_(3)underset("(rearrangement)")overset(1,2H(Ө)"shift")to C_(6)H_(5)-overset(+)CH-CH_(2)-overset(CH_(3))overset(|)CH-CH_(3)to ` trans + cis. Trans is major product due to thermodynamically more stable as well as carbocation show anti elimination. |
|
| 56. |
Decreasing order of reactivity in Williamson synthesis orf the following . `Me_(3)C CH_(2)Br` `CH_(3)CH_(2)CH_(2)Br` `CH_(2)=CHCH_(2)CI` `CH_(3)CH_(2)CH_(2)CI` .A. `III gt II gt IV gt I`B. `I gt II gt IV gt III`C. `III gt II gt IV gt I`D. `I gt III gt II gt IV` |
| Answer» Correct Answer - C | |
| 57. |
Which of the following is industrially prepared by passing ethylene into hyp[ochlorous acidA. Ethylene glycolB. Ethylene oxideC. Ethylene dinitrateD. Grignard synthesis |
|
Answer» Correct Answer - A `underset("Ethylene")(H_(2)C=CH_(2))+underset("(hypochlorous)")(HOCl)to underset("Ethylene chlorohydrine")underset(Cl)underset(|)(H_(2)C-O-MgI)overset([NaHCO_(3)])tounderset("(Ethylene glycol)")(underset(OH)underset(|)(H_(2)C)-underset(OH)underset(|)(CH_(2)))+NaCl+CO_(2)` |
|
| 58. |
`C_(6)H_(5)-CH=CHCHO overset(x)to C_(6)H_(5)CH=CHCH_(2)OH`. In the above sequence X can beA. `H_(2)`/NiB. `NaBH_(4)`C. `K_(2)Cr_(2)O_(7)//H^(+)`D. Both (a) and (b) |
|
Answer» Correct Answer - B `NaBH_(4)` and `LiAIH_(4)` attacks only carbonyl group and reduce it into alcohol group. They do not attack on double bond. `underset("cinnamic aldehyde")(C_(6)H_(5)-CH=CHCHO)overset(NaBH_(4))to C_(6)H_(5)-underset("cinnamicalcohol")(CH=CH.CH_(2)OH)` |
|
| 59. |
Ethyl methyl ether on heating with `PCl_(5)` producesA. ethyldence dichloride and methylene dichlorideB. acetyl chloride and methyl chlorideC. ethyl chloride and methyl alcoholD. ethyl chloride and methyl chloride |
|
Answer» Correct Answer - D Phosphorus pentanchloride brings about the cleavage of carbon-oxygen bond of ethers leading to the formation of alkyl halides. `CH_(3)CH_(2)OCH_(3)overset(PCl_(5))(rarr)CH_(3)CH_(2)Cl+CH_(3)Cl+POCl_(3)` |
|
| 60. |
Which of the following is not an isomer of diethyl ether?A. EthoxyethaneB. `2-`MethoxypropaneC. `2-`Methylpropan`-1-ol`D. `2-`Methylpropan`-2-ol` |
|
Answer» Correct Answer - A Diethylether and ethoxyethane are the same compounds `CH_(3)CH_(2)-O-CH_(2)CH_(3)` Other are isomers ltbRgt `2impliesCH_(3)CH_(2)CHOCH_(3)` `3impliesHOCH_(2)overset(CH_(3))overset(|)(C )HCH_(3)` `4impliesCH_(3)overset(OH)overset(|)underset(CH_(3))underset(|)(C )CH_(3)` |
|
| 61. |
Explain briefly the formation of the product giving structures of the intermediates. |
| Answer» Reaction proceeds benzyne mechanism (elimination-addition ArSN reaction). | |
| 62. |
Dehydration of 2-butanol yieldA. 1-buteneB. 2-buteneC. 2-butyneD. Both (a) and (b) |
|
Answer» Correct Answer - D `underset("2-butanol")(CH_(3)-CH_(2)-overset(OH)overset(|)CH-CH_(3))overset("dehydration")to underset("1-butene")(CH_(3)-CH_(2)-CH)=underset("2-butene Major product")(CH_(2)+CH_(3)-CH=CH-CH_(3))` |
|
| 63. |
Which reahent is useful in coverting 1-butanol to 1-bromobutaneA. `CHBr_(3)`B. `Br_(2)`C. `CH_(3)Br`D. `PBr_(3)` |
|
Answer» Correct Answer - D `3CH_(3)CH_(2)CH_(2)CH_(2)-OH + PBr_(3) to 3CH_(3)CH_(2)CH_(2)CH_(2)-Br+H_(3)PO_(3)` |
|
| 64. |
A compound X of formula `C_(3)H_(8)O` yields a compund `C_(3)H_(6)O`, on oxidation . To which of the followig classes of compounds could X belongA. Secondary alcoholB. AlkeneC. AldehydeD. Tertiary alcohol |
| Answer» Correct Answer - A | |
| 65. |
Which statement is not correct about alcoholA. Alcohol is lighter than waterB. Alcohol evaporates quicklyC. Alcohol of less no. of carbon atoms is less soluble in water than alcohol of high no. of carbon atomsD. All of these |
|
Answer» Correct Answer - B Alcohols having less number of carbon atoms are more soluble in water. |
|
| 66. |
Which of the following is not characteristic of alcoholsA. Lower alcohols are stronger and have bitter tasteB. Higher alcohols are stronger and have bitter tasteC. The boiling points of alcohols increase with increasing molecular massD. The lower alcohols are soluble in water |
|
Answer» Correct Answer - B Higher alcohols are stronger and have bitter taste. |
|
| 67. |
In which case the product is neither a cyclic ether nor open chain symmetrical ether-A. `CH_(3)-CH=CH-CH_(3)overset(C_(6)H_(5)CO_(3)H)to`B. `CH_(3)CH_(2)ON a+C_(2)H_(5)Brto`C. `KCN+(CH_(3))_(3)Cbrto`D. `C_(2)H_(5)OH("Excess")+H_(2)SO_(4)overset(140^(@))to` |
|
Answer» Correct Answer - C Reaction of R-X with KCN does not produce ether. |
|
| 68. |
In which case ether is formed-A. `(CH_(3))_(3)C-Br+overset(ө)(CN)`B. `CH_(3)CH_(2)Br+(CH_(3))_(3)CO^(-)`C. `(CH_(3))_(3)C-Cl+overset(ө)(OC)_(2)H_(5)`D. None of the above. |
| Answer» Correct Answer - B | |
| 69. |
Main constituent of dynamite isA. NitrobenzeneB. NitroglycerineC. Picric acidD. TNT |
|
Answer» Correct Answer - B A mixture of glyceryl trinitrate and glyceryl dinitrate when absorbed on kieselgurh is called dynamite. |
|
| 70. |
The shock-sensitive substance present in dynamite isA. B. C. D. |
|
Answer» Correct Answer - C Dynamite is a mixture of nitroglycerine `[CH_(2)ONO_(2)CHONO_(2)CH_(2)ONO_(2)]` with other substance to make the explosive safer to handle and to have specific explosive properties. |
|
| 71. |
The smallest alcohol that shows optical activity isA. `t`-butyl alcoholB. isopentyl alcoholC. isobutyl alcoholD. sec-butyl alcohol |
|
Answer» Correct Answer - D It has just one chiral carbon atom `CH_(3)CH_(2) - underset("sec -Butyl alcohol") (underset(CH_(3))underset(|)overset(H) overset(|)(C^**)-OH)` |
|
| 72. |
Which of the following is a secondary alcohol ?A. Neopentyl alcoholB. Isobutyl alcoholC. Isopetyl alcoholD. Isopropyl alcohol |
|
Answer» Correct Answer - D In a secondary alcohol , the `-OH` functional group is bonded to the secondary carbon atom of an alkyl group. `CH_(3)-underset("Isopropyl alcohol")underset(2^(@))overset(OH)overset(|)(CH-CH_(3)` Other alcohols are pimary alcohols `H_(3)C-underset("Neopentyl alcohol")(underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-overset(1^(@))(CH_(2))OH), H_(3)C-underset("Isobutyl alcohol")(overset(CH_(3))overset(|)(CH))-overset(1^(@))CH_(2)OH` `H_(3)C-underset("Isopentyl alcohol")overset(CH_(3))overset(|)(CH)-CH_(2)overset(1^(@))CH_(2)OH` |
|
| 73. |
Open-chain saturated monochydric alcohols have the general formulaA. `C_(n)H_(2n + 1)O`B. `C_(n)H_(2n + 2)O`C. `C_(n)H_(2n)O_(2)`D. `C_(n)H_(2n)O_(2)` |
|
Answer» Correct Answer - B Open-chain saturated monohydric alcohols are hydroxyl derivatives of alkanes `underset(C_(n)H_(2n+2))(R-H)overset(-H)underset(+OH)rarr underset(C_(n)H_(2n+2^(O)))underset(or)underset(C_(n)H_(2n+1)OH)(R-OH)` The general formula `C_(n)H_(2n+2)O_(2)` is applicable to alkanediols. |
|
| 74. |
Match the following colums : |
| Answer» Correct Answer - a-q; b-q,s; c-q,r; d-r,s | |
| 75. |
Column -Iand Column -II contains four entries each. Entry of column-I are to be uniquely matched with only one entry of column-II |
|
Answer» Correct Answer - a-q; b-s; c-p; d-r (a) Surface area more`" "`(b) Low M.W. (c ) H-bonding`" "` (d) Comparatively |
|
| 76. |
P is :A. B. C. D. |
| Answer» Correct Answer - c | |
| 77. |
Match the folowing columns : |
| Answer» Correct Answer - a-q,s; b-p,r; c-s,t; d-r | |
| 78. |
Match the folowing columns : |
| Answer» Correct Answer - a-p,r; b-q,t; c-p,s; d-q,t | |
| 79. |
Match the following columns : |
| Answer» Correct Answer - a-r,s; b-q; c-t; d-t | |
| 80. |
Match the foolwing columns : |
| Answer» Correct Answer - a-r; b-q; c-s; d-p | |
| 81. |
X is :A. B. C. D. |
| Answer» Correct Answer - a | |
| 82. |
Select the correct statement about oroducts A, B and C.A. A is a secondary alcoholB. B is a tertiary alcoholC. C is a primary alcoholD. A and C are tertiary alcohol |
| Answer» Correct Answer - c | |
| 83. |
Match the folowing columns : |
| Answer» Correct Answer - a-r,s; b-q; c-t; d-p,r | |
| 84. |
The compound which gives positive iodoform test is :A. 1-pentanolB. 2-pentanoneC. 3-pentanoneD. pentanal |
| Answer» Correct Answer - b | |
| 85. |
End-product of which of following reaction give positive Iodoform test.A. `H-overset(O)overset(||)C-Clunderset((ii)H^(o+))overset((i)CH_(3)MgBr("excess"))rarr`B. `H-overset(O)overset(||)C-Etunderset((ii)H^(o+))overset((i)CH_(3)MgBr("excess"))rarr`C. `H-overset(O)overset(||)C-O-Etunderset((ii)H^(o+))overset((i)CH_(3)MgBr("excess"))rarr`D. `H-overset(O)overset(||)C-Hunderset((ii)H^(o+))overset((i)CH_(3)MgBr("excess"))rarr` |
| Answer» Correct Answer - a,b,c,d | |
| 86. |
On oxidation of alcohol with `H^(o+) K_(2)Cr_(2)O_(7)`, maximum yield of compound will be obtained in :A. `i^(@)` alcoholB. `2^(@)` alcoholC. `3^(@)` alcoholD. equal in `1^(@)"and" 2^(@)` alcohol |
|
Answer» Correct Answer - b `1^(@)` give acid, `3^(@)` do not oxidize in such solution. |
|
| 87. |
Dehydration of alcohol take place more rapidlywith `POCL_(3)`then with `H_(2)SO_(4)`. Select the correct statements about the following dehydration reaction :A. It does not involve carbocation .B. It involves R-`OPOCl_(2)" with " -OPOCl_(2)`as a better leaving group.C. It involves E2 mechanism as pyridine base abstracts proton from the adjacent carbon as the same time at which -`OPOCl_(2)` is leaving .D. It is E1 reaction without formation of carboction. |
| Answer» Correct Answer - a,b,c | |
| 88. |
Match the chemical conversions in List -I with the appropriate reagents in List-II and select the correct answer using the code given below and lists. |
| Answer» Correct Answer - a-q; b-r; c-p; d-s | |
| 89. |
How many out of the following reagents will change 1- propanol into propanaldehyde? (a ) `H^(+)//KMnO_(4)//(/_)` (b )TsCl / DMSO + `NaHCO_(3)` (c ) P.C.C(pyridinium chloro chromate) (d ) Bendict solution (e )Red hot Cu tube ( f) `H^(+)//K_(2)Cr_(2)O_(7)//(/_)` ( g) `NBS//(/_)` ( h)` SeO_(2)//(/_)` |
| Answer» Correct Answer - 4 | |
| 90. |
Acetaldehyde racts with `CH_(3)MgBr`. The compound formed will be-A. `CH_(3)CH_(2)OH`B. `CH_(3)CHOHCH_(3)`C. `CH_(3)CH_(2)CH_(2)OH`D. None of these |
|
Answer» Correct Answer - B `CH_(3)-overset(O)overset(||)(C)-H+CH_(3)-MgBroverset(HOH)toCH_(3)-underset(CH_(3))underset(|)overset(OH)overset(|)(C)-H` |
|
| 91. |
Nitrobezene is formed as the major product along with a minor product in the reaction of benzene with a hot mixture of nitric acid and sulphuric acid. The minor product consists of carbon: `42.86%`, hydrogen: `2.40%`, nitrogen: `16.67%`, and oxygen: `38.07%` (i) Calculate the empirical formula of the minor product, (ii) when `5.5` gm of the minor product is dissolved in 45 gm of benzene, the boioling point of the solution is `1.84^(@)C` higher than that of pure benzene. Calculate the molar mass of the minor product and determine its molecular its molecular and structural formula. (Molal boiling point elevation constant of benzene is `2.53 K kg mol^(-1)`.) |
|
Answer» The rations of atoms in the minor products are : `C:H:N:O` `{:( ::(42.86)/(12):(2.40)/(1):(16.67)/(14):(38.07)/(16)),( ::3.57 : 2.40 : 1.19 : 2.38), ( :: 3 : 2 : 1 : 2):}` Empirical formula of the minor product: `C_(3)H_(2)NO_(2)` Molar empirical formula mass of the minor product is `(3xx12+2xx1+1xx14+2xx16)` gm `mol6(-1)` `= 84 gm mol^(-1)` Let M be the molar mass of the minor product. For `5.5` gm of the minor product dissloved in 45 gm benzene, the molality of solution is given by `m = (55gm//M)/0.045 kg)` Subsituting this in the expression of elevation of boiling point, we get `Delta T_(a) = K_(b)m` `1.84 K = (2.53K kg mol^(-1))` `((55gm//M)/(0.045kg))` `M = ((2.53xx55)/(1.84xx0.045))gm mol^(-1)` `=168gm mol^(-1)` Number of unit of empirical formula in the moleculat formula `= (168gm mol^(-1))/(84gm mol^(-1))=2` Hence, the molecular formula of the minor product is `2(C_(3)H_(2)NO_(2))`, i.e., `C_(6)H_(4)(NO_(2))` . The product is m-dinitrobenzene. |
|
| 92. |
A compound `C_(6)H_(14)O_(2)` has two tertiary groups. The `IUPAC` name of the compound isA. `2,3`-dimethylbutane -`1,2`-diolB. `2,3`-dimethylbutane -`2,3`-diolC. `3,3`-dimethylbutane-`1,2`-diolD. `2`-methylpantene-`2,3`-diol |
|
Answer» Correct Answer - B Tertiary alcoholic group is `- underset(|) overset(|)(C )- OH`. The compound , `C_(6)H_(14)O_(2)` , having two tertiary alcoholic groups has the structure : `H_(3)overset(1)(C) - underset(OH) underset(|) overset(CH_(3)) overset(|2) (C) - underset(2 , 3-"Dimethylbutane - 2, 3-diol")(underset(OH) underset(|) overset(CH_(3)) overset(|3) (C) - overset(4)(CH_(3))` |
|
| 93. |
Which of the following is soluble in water?A. `CHCl_(3)`B. `C_(2)H_(5)OH`C. `CS_(2)`D. `C Cl_(4)` |
|
Answer» Correct Answer - B `C_(2)H_(5)OH` is soluble in water because (unlike others) it can form hydrogen bonds with water: `CH_(3)CH_(2)-underset(H)underset(|)(ddotO: )----overset(delta+)(H)-underset(H)underset(|)(ddotO: )` |
|
| 94. |
The total number of alcohols (including stereoisomers) possible with the formula `C_(5)H_(12)O` isA. `8`B. `10`C. `11`D. `9` |
|
Answer» Correct Answer - C Draw the five carbon atoms in sequence and then positions the `OH` giving three structural isomers. `underset(underset(underset("Diethylcarbinol")(n-"Pentylalchol"))(Pentan-1-ol(1^(@))))(CH_(3)CH_(2)CH_(2)CH_(2)CH_(2)OH) underset(C^(2)"is chiral"(+,-))underset("methylpropylcarbinol")underset("Pentan-2-ol(2^(@)))(CH_(3)overset(**)CH(OH)CH_(2)CH_(2)CH)` `underset("Diethylcarbinol")underset("Pentan-3-ol")(CH_(3)CH_(2)CH(OH)CH_(2)CH_(3))` Draw four carbon atoms in sequence and then position `CH_(3)` and `OH` to give four structural isomers. `underset("Isobutylcarbinol")underset(3-"Methylbutan-1-ol"(1^(@)))(CH_(3)overset(CH_(3))overset(|)(CH)CH_(2)CH_(2)OH) underset(C^(2) "is chiral"(+,-))underset("Methylisopropylcarbinol")underset(3-"Methylbutane-2-ol(2^(@)))(CH_(3)overset(CH_(3))overset(|)(CH)underset(OH)underset(|)overset(**)(CH)CH_(3))` `CH_(3) underset("Dimethylethylcarbinol") underset (t -"Pentylalcohol") underset(3-"Methylbutan"-2-ol(3^(@))) (underset(OH)underset(|) overset(CH_(3))overset(|)(C)CH_(2)CH_(3)) , underset("C^(2) is chiral(+ ,-)") underset("Sec-Butylcarbinal") underset(2-"Methylbutan"-1-ol(1^(@)))(HOCH_(2)overset(CH_(3))overset(|**)(CH)CH_(2)CH_(3))` With three sequential carbon atoms, there is just one structural isomer : `CH_(3) - underset(t-"Butylcarbinol") underset("Neopentylalcohol") underset(2 ,2-"Dimethylpropan"-1-ol(1^(@)))(underset(CH_(3)) underset(|) overset(CH_(3)) overset(|)(C)-CH_(2)-OH)` Thus, a total of eleven alcohols (including stereoisomers) is possible |
|
| 95. |
The 'proof' of an alcoholic beverage is simply"_________" the percentage of ethanol (by volume).A. twiceB. halfC. thriceD. One third |
|
Answer» Correct Answer - A One hundred proof whisky is `50%` ethanol. |
|
| 96. |
Fermentation alone does not produce beverages with an ethanol content greater thanA. `10%`B. `15%`C. `12%`D. `17%` |
|
Answer» Correct Answer - B Because the enzymes of the yeast are deactivated at higher concentrations. To produce beverages of higher alcohol content the aqueous solution must be distilled.Brandy, whiskey, and vodka are produced in this way. The flavours of the various distilled liquors result from other organic compounds that distill with the alcohol and water. |
|
| 97. |
Which of the following gases is released during fermentation ?A. `O_(2)`B. `H_(2)`C. `CO_(2)`D. `CO` |
|
Answer» Correct Answer - C `C_(6)H_(12)O_(6) overset(Zymase)rarr2C_(2)H_(5)OH + 2CO_(2)` |
|
| 98. |
Which of the following is commonly employed for removing water from ethanol ?A. `Na`B. `H_(2)SO_(4)`C. `CaCl_(2)`D. `CaO` |
|
Answer» Correct Answer - D `C_(2)H_(5)OH + Na rarr C_(2)H_(5)overset(-)ONa^(+) + (1)/(2)H_(2)` When ethyl alcohol is treated with concentrated sulphuric acid , the ester ethyl hydrogen sulphate , `C_(2)H_(5)HSO_(4)`, is formed . `CH_(3)CH_(2)O-H+HO-SO_(2)-OHrarrCH_(3)CH_(2)OSO_(2)OH+H_(2)O` If excess of alcohol is present, ester reacts forming diethyl ether : `CH_(3)CH_(2)OSO_(2)OH + CH_(3)CH_(2)OH rarr CH_(3)CH_(2)OCH_(2)CH_(3) + H_(2)SO_(4)` If the sulphuric acid is in excess and the temperature is raised above `170^(@)C` , the ester decomposes yielding ethylene: `CH_(3)CH_(2)OSO_(2)OH rarr C_(2)H_(4) + H_(2)SO_(4)` Ethanol cannot be dried by means of calcium chloride , since a compound (an alcoholate) is formed , `CaCl_(2).3C_(2)H_(5)OH`.Distillation of rectified spirit over calcium oxide , and then over calcium , gives absolute alcohol. |
|
| 99. |
Which of the following is commonly used in anhydrous condition for the detection of an alcohol in the laboratory?A. `CH_(3)MgI`B. `ZnCl_(2)//HCl`C. `Na`D. `NaOH` |
|
Answer» Correct Answer - C Alcohol is acidic enough to react with Na to liberate `H_(2)` with brisk effervescence: `2ROH +2Na rarr 2RO^(-) Na^(+) +H_(2)` |
|
| 100. |
Identify product when (R) - and (S) -2 - butanol reacts with (R, R) tartaric acid in acidic medium.A. RacemicB. DiastereomerC. MesoD. Pure enantiomer |
|
Answer» Correct Answer - B `underset("(Diastereomer ) "[R R+RS])underset(darr)("(R) & (S)" - 2 -" butanol "+ (R, R-)" tartaric acid")` |
|