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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.
| 201. |
The boiling point of alcohol are…… than corresponding thiolsA. MoreB. SameC. Either of theseD. Less |
| Answer» Correct Answer - A | |
| 202. |
An alcohol on oxidation is found to give `CH_(3)COOH` and `CH_(3)CH_(2)COOH`. The structure to the alcohol isA. `CH_(3)CH_(2)CH_(2)OH`B. `(CH_(3))_(3)C(OH)CH_(2)CH_(3)`C. `CH_(3)CH_(2)CHOHCH_(3)`D. `CH_(3)CH(OH)CH_(2)CH_(2)CH_(3)` |
| Answer» Correct Answer - A | |
| 203. |
The reaction between an alcohol and an acid with the elimination of water molecules is calledA. EsterficationB. SaponificationC. EtherificationD. Elimination |
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Answer» Correct Answer - A `(CH_(3)COOH+CH_(3)OH underset("esterification")to CH_(3)COOCH_(3)+H_(2)O` |
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| 204. |
Alcohols of low molecular weight areA. Soluble in waterB. Soluble in all solventsC. Insoluble in all solventsD. Soluble in water on heating |
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Answer» Correct Answer - B Lower alcohols are soluble in all solvents |
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| 205. |
When ethyl alcohol reacts with acetic acid, the products formed areA. Sodium ethoxide + hydrogenB. Ethyl acetate + waterC. Ethyl acetate + soapD. Ethyl alcohol + water |
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Answer» Correct Answer - B `C_(2)H_(5)OH + CH_(3)COOH underset("Esterfication")overset(H_(2)SO_(4))to underset("Ethyl acetate")(CH_(3)COOC_(2)H_(5))+ H_(2)O` |
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| 206. |
What is the product obtained when chlorine reacts with ethyl alcohol in the presence of NaOHA. `CH_(3)Cl`B. `C_(2)H_(5)Cl`C. `"CC"l_(3)CHO`D. `CHCl_(3)` |
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Answer» Correct Answer - D When chlorine reacts with ethyl alcohol in the presence of NaOH, chloroform is obtained as a final product. `CH_(3)CH_(2)OH + Cl_(2) overset("Oxidation")to underset("Acetaldehyde")(CH_(3)CHO)+2HCl` `CH_(3)CHO+3Cl_(2) overset("Chlorination") to underset("Chloral")("CC"l_(3)CHO)+3HCl` `"CC"l_(3)CHO + NaOH overset("Hydrolysis")to underset("Chloroform")(CHCl_(3))+ HCOONa` |
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| 207. |
The -OH group of methyl alcohol cannot be replaced by chlorine by the action ofA. ChlorineB. Hydrogen chlorideC. Phosphorus trichlorideD. Phosphorus pentachloride |
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Answer» Correct Answer - A `CH_(3)OH+Cl_(2) to ` No reaction `CH_(3)OH + HCl overset(ZnCl_(2))to CH_(3)Cl + H_(2)O` `3CH_(3)OH+PCl_(3) to 3CH_(3)Cl + H_(3)PO_(3)` `CH_(3)OH+PCl_(5) to CH_(3)CL + POCl_(3)+HCl` |
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| 208. |
Reaction of phenol with chloroform/sodium hydroxide to give o- hydroxy benzaldehyde involves the formation ofA. Dichloro carbeneB. Trichloro carbeneC. Chlorine atomsD. Chlorine melcules |
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Answer» Correct Answer - A This is Reimer-Tiemann reaction where the electrophile is dichlorocarbene `(:"CC"l_(2))` generated from chloroform by the action of a base. `OH^(-)+CHCl_(3) hArr HOH+:"CC"l_(2)^(-) to Cl^(-)+:"CC"l_(2)` |
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| 209. |
Formation of methyl tertiary butyl ether by the reaction of sodium tertiary butoxide and methyl bromide involvesA. Elimination reactionB. Electrophilic addition reactionC. Nucleophilic addition reactionD. Nucleophilic substitution reaction |
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Answer» Correct Answer - D The formation of methyl t-butyl ether by the reaction of sodium tertiary butoxide and methyl bromide involves nucleophilic substitution `(S_(N^(2)))` reaction of alkyl halides in which halogen is replaced by alkoxy group. |
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| 210. |
Assertion :Etherates are coordinates complexes of ethers with Lewis acids. Reason : Ethers are easily cleaved by mineral acids such as HCl and `H_(2)SO_(4)` at 373 K.A. if both assertion and reason are true and the reason is the correct explanation of the assertionB. If both assertion and reason are true but reason is not the correct explanation of the assertion.C. If assertion is true but reason is falseD. If the assertion and reason both are false |
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Answer» Correct Answer - C Ethers being Lewis bases from etherates with Lewis acids. |
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| 211. |
Ethyl lcohol on oxidation with `K_(2)Cr_(2)O_(7)` givesA. Acetic acidB. AcetaldehydeC. FormaldehydeD. Formic acid |
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Answer» Correct Answer - A `CH_(3)CH_(2)OH overset(k_(2)Cr_(2)O_(7))to CH_(3)COOH` |
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| 212. |
The reagent which easily reacts with ethanol and propanol isA. Fehling solutionB. Grignard reagentC. Schiff reagentD. Tollen reagent |
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Answer» Correct Answer - B `C_(2)H_(5)OH + R-Mg-Xto underset("Alkane")(RH)+ C_(2)H_(5)OMgX` `C_(3)H_(7)OH + R - Mg -X to RH + C_(3)H_(7)OMgX` |
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| 213. |
2-propanol `+ NaBr overset("reflux")to X`. What is XA. 2-bromopropaneB. PropaneC. PropeneD. Propanone |
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Answer» Correct Answer - A `CH_(3)-underset(OH)underset(|)CH-CH_(3)+NaBr underset(Delta)overset("conc." H_(2)SO_(4))to underset("2-bromo propane")(CH_(3)-underset(Br)underset(|)CH-CH_(3)+H_(2)O` |
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| 214. |
Statement-1 Resorcinol turns `FeCI_(3)` solution purple Statement - 2 Resorcinol is a dihydric phenolA. if both assertion and reason are true and the reason is the correct explanation of the assertionB. If both assertion and reason are true but reason is not the correct explanation of the assertion.C. If assertion is true but reason is falseD. If the assertion and reason both are false |
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Answer» Correct Answer - A Phenols on treatment with neutral `FeCl_(3)` solution produce purple colour, resorcinol contains phenolic group hence in treatement with `FeCl_(3)` solution it gives purple colour. Here both assertion and reason are correct and reason is a correct explanation of assertion. |
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| 215. |
Which of the following reagents convert the propene to `1`-propanol?A. `H_(2)O,H_(2)SO_(4)`B. Aqueous KOHC. `MgSO_(4),NaBH_(4)//H_(2)O`D. `B_(2)H_(6),H_(2)O_(2),OH^(-)` |
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Answer» Correct Answer - D `6CH_(3)-underset("Prop-I-en")(CH)=CH_(2)+ B_(2)H_(6)to 2(CH_(3)-CH_(2)-CH_(2))_(3)B overset(6H_(2)O_(2))to 6CH_(3)-underset(Propan-I-ol)(CH_(2)-CH_(2))-OH+2H_(3)BO_(3)` |
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| 216. |
Asserion: Lucas reagent is a micture of anhydrous `ZnCI_(2)` and concentrate `HCI`. Reaon: Primary alcohol produces ppt. with Lucas reagents.A. if both assertion and reason are true and the reason is the correct explanation of the assertionB. If both assertion and reason are true but reason is not the correct explanation of the assertion.C. If assertion is true but reason is falseD. If the assertion and reason both are false |
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Answer» Correct Answer - C Lucas reagent is a mixture of anhydrous `ZnCl_(2)` and conc. HCl is used for the distinction of monohydric alcohol. Tertiary alcohols on addition produce a precipitate immediately while secondary alcohol do not produce any precipitate . Therefore, assertion is true but reason is false. |
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| 217. |
The desired product X can be prepared reacting the major product of the reactions in list-I with one or more appropriate reagents in list-II . Match each reaction in List-I with one or more appropriate reagents in List-II. (Given , order of migratory aptitude : aryl `gt` alkyl `gt` hydrogen) |
| Answer» Correct Answer - `P to 1, 5; Q to 2,3; R to 1,5; S to 2,3` | |
| 218. |
The reaction in the conversion of (B) and (C) is calledA. Dakin reactionB. Baeyer-Villiger reactionC. Pinacol-Pinacolone reactionD. Oppenauer oxidation |
| Answer» Correct Answer - B | |
| 219. |
The compound (D) isA. B. C. D. |
| Answer» Correct Answer - C | |
| 220. |
Tonics in general containA. EtherB. MethanolC. EthanolD. Rectified spirit |
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Answer» Correct Answer - C Tonics contain ethyl alcohol |
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| 221. |
`(A) overset(LiAlH_(4))(rarr)underset("(Chiral alcohol only)")(2(B))`, structure of (A) is :A. `CH_(3)-underset(Et)underset(|)(CH)-overset(O)overset(||)(C)-O-underset(Et)underset(|)(CH)-CH_(3)`B. `CH_(3)-underset(Et)underset(|)(CH)-overset(O)overset(||)(C)-O-CH_(2)-underset(Et)underset(|)(CH)-CH_(3)`C. D. |
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Answer» Correct Answer - B (B) is `underset("(Chiral)")(CH_(3)-underset(Et)underset(|)(CH)-CH_(2)-OH)` |
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| 222. |
In the given pair of alcohol, in which pair second alcohol is more reactive than first towards hydrogen bromide?A. B. C. `CH_(3)-underset(OH)underset(|)(CH)-CH_(2)-CH_(3)` and `CH_(3)-CH_(2)-underset(CH_(3))underset(|)(CH)-CH_(2)-OH`D. `CH_(3)-underset(OH)underset(|)(CH)-CH_(2)-CH_(3)` and `(CH_(3))_(2)underset(OH)underset(|)(C)-CH_(2)-CH_(3)` |
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Answer» Correct Answer - D `CH_(3)-underset(OH)underset(|)(CH)-CH_(2)CH_(3) overset(H^(+))(rarr) CH_(3)-underset(o+)(C)H-CH_(2)CH_(3)" "2^(@)` carbocation `CH_(3)-underset(OH)underset(|)overset(CH_(3))overset(|)(C)-CH_(2)CH_(3) overset(H^(+))(rarr)CH_(3)-underset(o+)overset(CH_(3))overset(|)(C)-CH_(2)CH_(3)" "3^(@)` carbocation Stability order of carbocation `3^(@) gt 2^(@)` |
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| 223. |
Based on the above isomer answer the following (A to F). Which isomer is most reactive towards dehydration by conc. `H_(2)SO_(4)`? |
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Answer» Correct Answer - d d (due to formation of most stable carbocation) |
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| 224. |
`{:(CHO),("|"),(CH-OH" "overset(2HIO_(4))(rarr)),("|"),(CH_(2)-OH):}` Products obtained in the above reaction are :A. `HCHO, HCO_(2)H`B. `HCHO, 2HCO_(2)H`C. `CO_(2), 2HCO_(2)H`D. `CO_(2), HCHO, HCO_(2)H` |
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Answer» Correct Answer - B `{:(CHO),("|"),(CH-OH" " overset(2HIO_(4))(rarr)2HCO_(2)H+HCHO),("|"),(CH_(2)-OH):}` |
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| 225. |
Match the Column (I) and (II). |
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Answer» Correct Answer - a-s, b-r, c-q, d-p (a) `S_(N^(1))" "`(b) `S_(N^(2))" "`(c) `S_(N^(1))` then `S_(N^(2))" "`(d) `S_(N^(2))` |
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| 226. |
Di-tert-glycols rearrange in the presence of acid to give `alpha`-trtiary ketones. The trivial name of the simplest glycol of this type is pinacol, and this type of reaction therefore is named pinacol rearrangement (in this specific case, the reaction is called a pinacol-pinacolone rearrangement). The rearrangement involves 4 steps. one of the hydroxyl group is protonated in the first step. A molecule of water is eliminated in the second step and a tertiary carbocation is formed. the carbocation rearranges in the third step into a more stable carboxonium ion via a [1, 2] rearrangement. In the last step, the carboxonium ion is deprotonated and the product ketone is obtained. What is R.D.S. of pinacol-pinacolone rearrangement ?A. I stepB. II stepC. III stepD. IV step |
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Answer» Correct Answer - B (A) `II^(nd)` step (R.D.S.) |
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| 227. |
Conversion `R-CHO rarr R-CH_(2)-OH` can be done by :A. `LiAlH_(4)`B. `NaBH_(4)`C. `H_(2)//Ni`D. All of these |
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Answer» Correct Answer - D `LAH, NBH` and `H_(2)//N` reduces ald. to alcohol. |
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| 228. |
Reduction of `R-CH_(2)OH-RCH_(3)` can be carried out by:A. `LiAlH_(4)`B. `NaBH_(4)-AlCl_(3)`C. `H_(2)-Ni`D. `Red P+HI` |
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Answer» Correct Answer - D Red `P + HI` converted alcohol in to alkene. |
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| 229. |
Amongst the following compounds, the compound having the lowest boiling point isA. B. C. D. |
| Answer» Correct Answer - C | |
| 230. |
Moles of `HCHO` formed are :A. `1, 1`B. `2, 2`C. `1, 2`D. `2, 1` |
| Answer» Correct Answer - A::C | |
| 231. |
Glycerine contains one ………. Hydroxyl group. |
| Answer» Correct Answer - Secondary | |
| 232. |
Which of the following reagents is not able to reduce an ester into an alcohol?A. `NaBH_(4)`B. `LiAlH_(4)`C. `Na,C_(2)H_(5)OH`D. `H_(2),Pt` |
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Answer» Correct Answer - A Sodium borohydride cannot reduce carboxylic acids and esters but can reduce aldehydes and ketones. |
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| 233. |
The yield of ketone when a secondary alcohol is oxidised is more than the yeild of aldehyde when a primary alcohol is oxidised. |
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Answer» Correct Answer - 1 Since `1^(@)` alcohol on oxidation first gives aldehyde and then acid. But `2^(@)` alcohol on oxidation gives ketone. |
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| 234. |
Which of the following reagents can distinguish between `t-`butyl alcohol and `n-`butyl alcohol?A. sodiumB. `ZnCl_(2) and Conc. HCl`C. `AgNO_(3) and NH_(4)^(+)OH^(-)`D. `CuCl_(2) and NH_(4)^(+)OH^(-)` |
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Answer» Correct Answer - B The difference in reactivity of three classes of alcohols with `HCl` distinguishes them from one another (Lucas test). Alcohols are soluble in Lucas reagent (conc. HCl and anhydrous `ZnCl_(2))` while their halides are immicible and produce turbidity is produced immediately as they form the halides easily. primary alcohols (such as `n-`butyl alcohol), do not produce turbidity at room temperature. |
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| 235. |
Name the reagents used in the following reactions: i. Oxidation of a primary alcohol to carboxylic acid. ii. Oxidation of a primary alchol to aldehyde. iii. Bromination of phenol to 2,4,6-tribromonophenol. iv. Benzyl alcohol to benzoic acid. v. Dehydration of propan-2-ol to propene. vi. Butan-2-one to butan-2-ol. |
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Answer» i. Acidified postassium dichromate or netural, acidic, or alkaline potassium permanganate. ii. Pyridinium chlorochromate (PCC). `overset (C_(5)H_(5)N^(o+)HCICrCO_(3)^(-)) underset (dichromate(PDC))`, in `CH_(2)CI_(2)` or Pyridinium `(C_(5)H_(5)N^(o+)H)_(2)Cr_(2)O_(7)^(2-)` in `CH_(2)CI_(2)` . iii. Aqueous bromine, i.e., `Br_(2)//H_(2)O`. iv. Acidifield or alkaline potassium permanganate. v. Conc. `H_(2)SO_(4)` at `433-443` K or `85%` phosphoric acid at 443K. vi. `Ni//H_(2)` or `NaBH_(4)` or `LiAIH_(4)` |
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| 236. |
Salol can be used as anA. antisepticB. `antipyreticC. both of theseD. none of these |
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Answer» Correct Answer - A Salol (phenyl salicylate) is used as an enteric coating for pills and as a paint for throat ailments. |
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| 237. |
Which of the following reactions is not correctly reported?A. `PhCH(OH)CH_(3)underset(H_(2)//Pd)overset(HClO_(4))rarrPhCH_(2)CH_(3)`B. `PhCH_(2)underset(H_(2)//Pd)overset(HClO_(4))rarrphCH_(3)`C. `Ph_(2)C(OH)CH_(2)CH_(2)OHoverset(HClO_(4))underset(H_(2)//Pd)rarrPH_(2)CHCH_(2)CH_(3)`D. `PhCOCH_(2)CH_(3)overset(HClO_(4))underset(H_(2)//Pd)rarrPhCH_(2)CH_(2)CH_(3)` |
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Answer» Correct Answer - C The process whereby `H_(2)` breaks sigma bonds is called hydrogenolysis. It is carried out by treating the alcohol with `H_(2)//Pd` containing some `HClO_(4)`. Hydrogenolysis product of `Ph_(2)C(OH)CH_(2)CH_(2)OH` is `Ph_(2)CHCH_(2)CH_(2)OH` because the nonbenzylic `OH` is not affeted. In the fourth case, the ketone is first reduced to the alcohol with this reagent. note that in the fifth case, the ring `OH` is not reduced. |
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| 238. |
Which among the following compounds will not give effervescence with sodium bicarbonate ?A. `C_(6)H_(5)CO_(2)H`B. `C_(6)H_(5)SO_(3)H`C. `C_(6)H_(5)OH`D. Picric acid |
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Answer» Correct Answer - C Phenol does not react with `NaHCO_(3)` or `NaCO_(3)`. Although picric acid is a phenolic compound (2,4,6-trinitrophenol), due to the presence of `3 NaO_(2)` groups (EWG), it is highly acidic and reacts with `NaHCO_(3)` or `NaCO_(3)`. |
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| 239. |
The intestinal antiseptic Salol is correctly represented as:A. B. C. D. |
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Answer» Correct Answer - B Salol is phenyl salicylate. |
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| 240. |
Which of the following will form a yellow precipitate of iodoform on heating with `I_(2)` and dilute `NaOH`?A. `CH_(3)CH_(2)CH_(2)OH`B. `CH_(2)CHOHCH_(3)`C. `PhCH_(2)CH_(2)OH`D. `PhCH_(2)CHOHCH_(2)CH_(3)` |
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Answer» Correct Answer - B An alcohol of the structure `R-underset(OH)underset(|)overset(H)overset(|)(C )-CH_(3)` where `R` is `H` or any alkyl or any aryl group is oxidized to acetaldehyde or a methyl ketone, and hence gives a positive iodoform test `CH_(3)-underset(OH)underset(|)overset(H)overset(|)(C )-CH_(3)underset("yellow precipitate")(overset(I_(2))underset(NaOH)(rarr)CHI_(3))` |
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| 241. |
Ethanol has higher boiling point than ethanol becauseA. ethanol is a polar compound but ethanol is notB. ethanol forms intermolecular hydrogen bond but ethanal does notC. ethanol has higher molecular mass than ethanolD. ethanol forms stronger intermolecular hydrogen bonds than does ethanol |
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Answer» Correct Answer - B Both ethanol and ethanol are polar compounds and have comparable molecular masses . The high melting point of ethanol is mainly due to the presence of intermolecular hydrogen bonding between its molecules which is lacking in ethanol. `C_(2)H_(5)-overset(delta-)ddotunderset(H)underset(|)(O)overset(.).---overset(delta+)(H)-overset(C_(2)H_(5))underset(delta+)underset(..)(O)overset(.)(.)---overset(delta+)(H)---overset(delta-)ddotunderset(C_(2)H_(5))underset(|)(O)overset(.)(.)---` |
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| 242. |
Which of the following alcohols has the highest boiling point ?A. MethanolB. 2-ButanolC. 1-ButanolD. 2-Methyl-2-propanol |
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Answer» Correct Answer - C All are alcohols and form H-bonding. Options (b), (c ), and (d) have four C atoms. Only (c ) is a straight-chain alcohol having a larger surface area, and thus high boiling point. |
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| 243. |
Among the following alcohols, which has the highest solubility in water?A. `(CH_(3))_(3)C-OH`B. `(CH_(3))_(2)CHCH_(2)CH_(2)CH_(2)OH`C. `CH_(3)(CH_(2))_(4)CH_(2)OH`D. `CH_(3)CH_(2)CH_(2)CH_(2)OH` |
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Answer» Correct Answer - A Solubility of alcohols in water is hindered by the hydrophobic nature of alkyl groups. `t-`Butyl alcohol has the highest sollubility in water as its alkyl group (being spherical) has the least surface area and hence the least hydrophobic interaction with water. |
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| 244. |
In the reaction the product isA. B. C. D. |
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Answer» Correct Answer - B The given reducing agent is aluminium isopropoxide in isopropanol solution (Meerwein -Ponndrof-Verely reduction). It is specific for the carbonyl group and does not reduce the carbon -carbon double bond. |
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| 245. |
Which of the following is expected to produce an alcohol on reaction with `NaNO_(2)` and dilute `H_(2)SO_(4)` at a temperature ranging from `0^(@)C` to `5^(@)C` ?A. TriethylamineB. EthylmethylamineC. DiethylamineD. sec-Butylamine |
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Answer» Correct Answer - D Only primary amines produce alcohols `underset("sec-Butylamine")(CH_(3)overset(NH_(2))overset(|)(CH)CH_(2)CH_(3)) underset(0-5^(@)C)overset(NaNO_(2)//H_(2)SO_(4))rarrCH_(3)overset(OH)overset(|)(CH)CH_(2)CH_(3)` |
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| 246. |
Give the decreasing order of reactivity of the following compounds with HBr. (I) A. `III gt IV gt II gt I`B. `III gt II gt IV gt I`C. `III gt II gt I gt IV`D. `II gt III gt IV gt I` |
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Answer» Correct Answer - C EDG favours `SN^(1)` reactivity with HBr. EWG retards `SN^(1)` reactivity with HBr. ED effect of `(-Me)` `(+R, -I)` is greater than (Me) group (+I and H.C.) So, reactivity of III gt II. In (IV), `(-OMe)` group is at m-position and exerts only -I effect and so reacitivity of (IV) is less than (I). So the reactivity order is: III gt II gt I gt IV. |
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| 247. |
Differentiate: (a). 1-Hexanol and 1-chlorohexane (b). Diethyl ether and n-butanol (c). Diethyl ether and n-pentane |
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Answer» (a) 1-hexanol reduces organ red `CrO_(3)` to green `Cr^(3+)`, while 1-chlorohexane gives white ppt. of AgCl on warming with ethanolic `AgNO_(3)` (b). `n`-butanol gives a positive test with `CrO_(3)` n acid and evolves `H_(2)` with sodium while dry ethyl ether is negative to both test. (c). Unlike `n`-pentane, diethyl ether is basic and dissolves in conc. `H_(2)SO_(4)` `(C_(2)H_(5))_(2)O+H_(2)SO_(4)to(C_(2)H_(5))_(2)OH^(+)+HSO_(4)^(-)` |
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| 248. |
`C-O-C` bond angle in diethyl ether is about-A. `180^(@)`B. `110^(@)`C. `150^(@)`D. `90^(@)` |
| Answer» Correct Answer - B | |
| 249. |
Diethyl ether absorbs oxygen to form-A. Red coloured sweety smelling compoundB. Acetic acidC. Ether sub oxideD. Ether peroxide. |
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Answer» Correct Answer - D `C_(2)H_(5)OC_(2)H_(5)overset("Oxygen")to"Ether peroxide"` |
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| 250. |
An organic compound A reacts with sodium metal and forms B. On heating with conc. `H_(2)SO_(4)`, A gives diethyl ether. So A and B areA. `C_(3)H_(7)OH and CH_(3)ON a`B. `CH_(3)OH and CH_(3)ON a`C. `C_(4)H_(9)OH and C_(4)H_(9)ON a`D. `C_(2)H_(5)OH and C_(2)H_(5)ON a` |
| Answer» Correct Answer - D | |