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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. |
Ethylene reacts with 1% cold alkaline `KMnO_(4)` to giveA. Oxalic acidB. AcetoneC. Ethylene glycolD. Formaldehyde |
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Answer» Correct Answer - C `CH_(2)=CH_(2)underset(KMnO_(4))overset(H_(2)O,[O])rarr overset(OH)overset(|)(CH_(2))-overset(OH)overset(|)(CH_(2))` |
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| 202. |
Ethy alcohol is...... to litmus :A. AcidicB. BasicC. NeutralD. None of these |
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Answer» Correct Answer - C Neutral |
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| 203. |
Ethanol cannot be dried by anhyd. `MgCl_(2)` becauseA. ethanol is soluble in waterB. explosion takes placeC. ethanol reacts with `MgCl_(2)`D. All the above |
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Answer» Correct Answer - C It forms addition compoud of formula `MgCl_(2).6C_(2)H_(5)OH` |
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| 204. |
Which of the following is most acidic?A. PhenolB. Benzyl alcoholC. m-ChlorophenolD. Cyclohexanol |
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Answer» Correct Answer - C Phenols are better acid than alcohols. So choice (A) and (C) is more probable. When electron attracting group is attached to phenol at m-position, then H-loss becomes further easier. |
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| 205. |
The reaction of neopentyl alcohol with concentrated HCl givesA. neopentyl chlorideB. 2-chloro-2-methylbutaneC. 2-methyl-2-buteneD. a mixture of neopentyl chloride and 2-methyl-2-butene |
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Answer» Correct Answer - B `CH_(3)-underset(CH_(2)OH)underset(|)overset(CH_(3))overset(|)(C)-CH_(3)-overset(H^(+))rarr CH_(3)-underset(CH_(2)^(+))underset(|)overset(CH_(3))overset(|)(C)-CH_(3) overset("Alkyl shift")rarr CH_(3)-underset(+)overset(CH_(3))overset(|)(C)-CH_(2)CH_(3) overset(Cl^(-))rarr CH_(3)-underset(Cl)underset(|)overset(CH_(3))overset(|)(Cl)-CH_(2)CH_(3)` |
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| 206. |
The solubility of methanol in water is due to the fact thatA. both have bent shapeB. both have `sp^(3)` hybridised oxygen atomsC. both form H-bonds with one anotherD. all the reasons are correct |
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Answer» Correct Answer - C Both form H-bonds with one another. |
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| 207. |
The reaction of Ethanol with `H_(2)SO_(4)` does not giveA. EthyleneB. Diethyl etherC. AcetyleneD. Ethyl hydrogen sulphate |
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Answer» Correct Answer - C Acetylene cannpt be produced from ethanol and `H_(2)SO_(4)`. |
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| 208. |
Which of the following will not be soluble in sodium carbonate soluton?A. B. C. D. |
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Answer» Correct Answer - C o-Nitrophenol is not sufficiently strong acid so as to react with `NaHCO_(3)`. |
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| 209. |
Which of the following alcohols has the highest boiling point ?A. MethanolB. 2-ButanolC. Butan-1-olD. 2-Methyl-2-propanol |
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Answer» Correct Answer - C `underset("Butanol-1")(H_(3)C-CH_(2)-CH_(2))-CH_(2)-OH` |
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| 210. |
Phenol is treated with bromine water and shaken well to get white precipitate is:A. 1-BromophenolB. 2,4,6-TribromophenolC. 2,4-DibromophenolD. Mixture of o-, p-bromophenol |
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Answer» Correct Answer - B Bromination of phenol in aqueous medium gives 2,4,6-tribromophenol. |
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| 211. |
Salol isA. Acetyl salicylic acidB. Phenol benzoateC. Acetyl salicylateD. Phenyl salicylate |
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Answer» Correct Answer - D Salol is phenyl salicylate. |
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| 212. |
Salol can be used asA. AnsepticB. AntipyreticC. BothD. None |
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Answer» Correct Answer - A As internal antiseptic |
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| 213. |
Which of the following give positive iodoform test ? (1) Ethanol, (2) Ethanal (3) Butan-1-ol, (4) Butan-2-ol (5) Phenyl ethanol.A. 1, 2 and 5B. 1, 3 and 4C. 1, 2 and 3D. 1, 2 and 4 |
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Answer» Correct Answer - D All the three give positive iodoform test. |
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| 214. |
Which of the following reagents will produce salicyldehyde on reaction with phenol?A. `CHCl_(3)+NaOH`B. `SiO_(2)+NaOH`C. `CHBr_(3)+KBrO_(3)`D. `KClO+HClO_(4)` |
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Answer» Correct Answer - A It is the correct answer. The reaction is called Reminer Tiemann Reaction. |
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| 215. |
Phenol is heated with a solution of mixture of `KBr` and `KBrO_(3)`. The major product obtained in the above reaction isA. 2-BromophenolB. 3-BromophenolC. 4-BromophenolD. 2, 4, 6-Tribromophenol. |
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Answer» Correct Answer - D Bromine `(Br_(2))` released in the reaction carries the bromination of phenol to form 2, 4, 6-tribromophenol. |
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| 216. |
Consider the following `"Ethanol" overset(PBr_(3))rarr X overset("alc.KOH")rarr underset((i) "Heat")overset((i) H_(2)SO_(4) "at room temp.")rarrZ` The product Z isA. `CH_(3)CH_(2)OH`B. `CH_(2) = CH_(2)`C. `CH_(3)CH_(2)-OCH_(2)CH_(3)`D. `CH_(3)CH_(2)OSO_(3)H` |
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Answer» Correct Answer - A `underset("ethanol")(C_(2)H_(5)OH)overset(PBr_(3))rarr C_(2)H_(5)Br overset("alc. KOH")rarr underset("ethene")(CH_(2)=CH_(2)) underset(underset((ii) H_(2)O, "boil")("room temperature"))overset((i) H_(2)SO_(4))rarr C_(2)H_(5)OH` |
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| 217. |
Consider the following reaction ethanol `overset(PBr_(3))(rarr)Xoverset(alc.KOH)(rarr)Yoverset((i)H_(2)SO_(4),"room temp".)underset((ii)H_(2)O,heat)(rarr)Z` the product `Z` isA. `CH_(3)CH_(2)OCH_(2)CH_(3)`B. `CH_(3)CH_(2)O SO_(3)H`C. `CH_(3)CH_(2)OH`D. `CH_(2)=CH_(2)` |
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Answer» Correct Answer - C `{:(underset("Ethanol")(C_(2)H_(5)OH),overset(PBr_(3))(rarr),underset((X))(C_(2)H_(5)Br),overset("alC "KOH)(rarr),underset((Y))(CH_(2)=CH_(2))),(,,,," "darr H_(2)SO_(4)),(,,underset((Z))(C_(2)H_(5)OH),overset(H_(2)O)(larr),CH_(3)CH_(2)HSO_(4)):}` |
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| 218. |
Write the IUPAC names of : (i) Crototyl alcohol (ii) Cinnanyl alcohol (iii) Isobutyl alcohol. |
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Answer» (i) But-2-en-1-ol (ii) 3-Phenylprop-2-en-1-ol. (iii) 2-Methylpropan-1-ol (iv) 1-Phenylethanol |
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| 219. |
Give the IUPAC names of the following : (i) `CH_(3)-underset(OH)underset(|)(CH)-CH_(2)-Cl` (ii) `CH_(3)-CH_(2)-CH_(2)-underset(C_(6)H_(5))underset(|)overset(OH)overset(|)(C)-CH_(2)-CH_(3)` (iii) `CH_(3)-overset(OH)overset(|)(CH)-underset(CH_(3))underset(|)(CH)-CH_(3)` (iv) `CH_(3)-CH_(2)-overset(CH_(2)Cl)overset(|)(CH)-CH_(2)-OH` (v) `CH_(3)-CH_(2)-overset(CH_(2)OH)overset(|)(CH)-CH_(2)-CH_(3)` (vi) `CH_(3)-underset(OH)underset(|)(CH)-CH=CH_(2)` (vii) `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH_(2)-CH_(2)-OH` (viii) `CH_(3)-underset(Br)underset(|)overset(CH_(3))overset(|)(C)-underset(Br)underset(|)overset(CH_(3))overset(|)(C)-CH_(2)-CH_(2)-OH` (ix) `CH_(3)-CH=CH-underset(OH)underset(|)(CH)-CH_(2)-CH_(3)` (x) `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH_(2)-underset(OH)underset(|)(CH)-CH_(3)` (xi) `CH_(3)-O-underset(CH_(3))underset(|)(CH)-CH_(3)` (xii) `CH_(3)-underset(CH_(3))underset(|)(CH)-CH_(2)-OH` |
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Answer» (i) 1-Chloropropan-2-ol (ii) 3-Phenylhexan-3-ol (iii) 3-Methylbutan-2-ol (iv) 2-Chloromethylbutan-1-ol (v) 2-Ethylbutan-1-ol (vi) But-3-en-2-ol. (vii) 3, 3-Dimethylbutan-1-ol (viii) 3, 4-Dibromo 3, 4-dimethylpentan-1-ol (ix) Hex-4-en-2-ol. (x) 4, 4-dimethylpentan-2-ol (xi) 2-Methoxypropane (xii) 2-Methylpropan-1-ol |
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| 220. |
Give the IUPAC names of : (i) `CH_(3)O-CH_(2)-CH_(2)-OCH_(3)" "(ii) CH_(3)-underset(OH)underset(|)(CH)-CH=CH_(2)` |
| Answer» (i) 1, 2-Dimethoxyethane (ii) But-3-en-2-ol. | |
| 221. |
Write IUPAC names of the following compouns : |
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Answer» (i) 2, 2, 4-Trimethylpentan-3-ol, (ii) 5-Ethylheptan-2, 4-diol (iii) Butane-2, 3, diol, (iv) Propane-1, 2, 3-triol (v) 2-Methylphenol, (vi) 4-Methylphenol (vii) 2, 5-Dimethylphenol, (viii) 2, 6-Dimethylphenol (ix) 1-Methoxy-2-methylpropane, (x) Ethoxybenzene (xi) 1-Phenoxyheptane, (xii) 2-Ethoxybutane. |
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| 222. |
Alcoholic beverages are made ofA. EthanolB. Acetic acidC. Formic acidD. None of these |
| Answer» Correct Answer - A | |
| 223. |
3 moles of ethanol reacts with one mole of phosphorous tribromide to form 3 moles of bromoethane and one mole of X. Which of the following is X?A. `H_(3)PO_(4)`B. `H_(3)PO_(2)`C. `HPO_(3)`D. `H_(3)PO_(3)` |
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Answer» Correct Answer - D `3CH_(3)CH_(2)OH+PBr_(3) rarr 3CH_(3)CH_(2)Br+H_(3)PO_(3)(X)` |
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| 224. |
o-nitrophenol (x) and p-nitrophenol (y) are two compounds. The melting point relationship between the two isA. `x gt y`B. `x = y`C. `x lt y`D. `x gt gt y` |
| Answer» Correct Answer - C | |
| 225. |
Grignard reagent on reaction with a ketone formsA. Tertiary alcoholB. Secondary alcoholC. Primary alcoholD. Carboxylic acid |
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Answer» Correct Answer - A Tertiary alcohol. |
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| 226. |
An unknown alcohol is treated with the "Lucas reagent" to determine whether the alcohol is primary, secondary or tertiary. Which alcohol reacts fastest and by what mechanims :A. secondary alcohol by `S_(N^(2))`B. teritary alcohol by `S_(N^(2))`C. secondary alcohol by `S_(N^(1))`D. teritary alcohol by `S_(N^(1))` |
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Answer» Correct Answer - D In Lucas test, a `3^(@)` alcohol react fastest. The mechanism followed is `S_(N^(1))`. It is due to the formation of stable carbocation. |
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| 227. |
Isopropyl benzene on air oxidation on the presence of dilute acid givesA. `C_(6)H_(5)COOH`B. `C_(6)H_(5)COOCH_(3)`C. `C_(6)H_(5)CHO`D. `C_(6)H_(5)OH` |
| Answer» Correct Answer - D | |
| 228. |
Ethylene oxide when treated with Grignard reagent yields.A. primary alcoholB. secondary alcoholC. tertiary alcoholD. cyclo propyl alcohol |
| Answer» Correct Answer - A | |
| 229. |
Ethylene glycol when heated in the presence of `H_(3)PO_(4)` yieldsA. EthanalB. Ethylene oxideC. DioxaneD. Diethylene glycol |
| Answer» Correct Answer - D | |
| 230. |
Coconut oil on alkaline hydrolysis givesA. GlycolB. AlcoholC. GlycerolD. Glucose |
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Answer» Correct Answer - C Glycerol (by saponification) |
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| 231. |
Saponification means hydrolysis of an ester withA. dil. NaOHB. `dil.H_(2)SO_(4)`C. enzymesD. none of the above |
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Answer» Correct Answer - A dil. NaOH. |
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| 232. |
The following compound on hydrolysis in aqueous acetone will give A. Mixture of (K) and (L)B. Mixture of (K) and (M)C. Only (M)D. Only (K) |
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Answer» Correct Answer - A Product (K) is formed through simple nucleophilic substitution `(S_(N)^(1))` while product `(L)` is formed through hydride shift `(H^(-))` through `S_(N^(1))` and `CH_(3)O^(-)` (methoxy) group stabilises the carbocation of product (L). |
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| 233. |
How will you convert propanone to tertiary butyl alcohol ? |
| Answer» `underset("Propanone")(CH_(3)-overset(O)overset(||)(C)-CH_(3)+CH_(3)MgBr) rarr underset("Addition compound")([CH_(3)underset(CH_(3))underset(|)overset(OMgBr)overset(|)(C)-CH_(3)]) overset(H_(2)O //H^(+))(rarr) underset("Tert-butyl alcohol")((CH_(3))_(3)COH+Mg(OH)Br)` | |
| 234. |
Complete the following : (i) `R-OH + PCl_(5) rarr` (ii) `R-OH+PCl_(3) rarr` |
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Answer» (i) `R-OH+PCl_(5) rarr R-Cl+POCl_(3)+HCl` (ii) `3R-OH+PCl_(3) rarr 3R-Cl+H_(3)PO_(3)` |
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| 235. |
(a) Write a short note on Reimer Tiemann reaction. (b) Complete the following : |
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Answer» (b) (i) Cyclohexanol is formed. (ii) A white precipitate of 2, 4, 6-tribromophenol is formed. |
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| 236. |
What happens when sodium salicylate is heated with sodalime ? |
| Answer» Correct Answer - Phenol is formed. | |
| 237. |
How many optically stereoisomers are possible for butene-2,3-diol ?A. 1B. 2C. 3D. 4 |
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Answer» Correct Answer - B Butane-2,3-diol has two asymmetric carbon atoms. `underset("Butane-2,3-diol")(CH_(3)-overset(OH)overset(|**)(CH)-overset(OH)overset(|**)(CH)-CH_(3))` Optically active stereoisomers are I and III `{:(" "CH_(3) " "CH_(3)" "CH_(3)),(" | ""| "" | "),(" "OH-C-H" "H-C-OH" "H-C-OH), ( " | "" | "" |" ),(" "H-C-OH" "OH-C-H" "H-C-OH),(" |"" |"" |"),(" "CH_(3)" "CH_(3)" "CH_(3) ),(" (I) (II) (III)"):}` III is meso form and is not optically active. |
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| 238. |
3-Methyl-1-butene on oxymercuration demercuration yields............as the major productA. 3-Methyl-2-butanolB. 2-Methyl-2-butanolC. 3-Methyl-1-butanolD. 2-Methyl-1-butanol |
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Answer» Correct Answer - A `underset("2-Methyl-1-butene")(CH_(3)-underset(CH_(3))underset(|)(CH)-CH-CH_(2)) underset((ii) "Demercuration")overset((i) "Oxymercuration")rarr underset("3-Methyl-1-butanol")(CH_(3)-underset(CH_(3))underset(|)(CH)-underset(OH)underset(|)(CH)-CH_(3))` The addition of water is in accordance with Markownikoff rule. |
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| 239. |
Compare the relative acidic strength of the following: (i) `CH_(3)OH` (ii) `CH_(3)CH_(2)OH` (iii) `CH_(3)CH(OH)CH_(3)` (iv) `(CH_(3))_(3)COH`. |
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Answer» The realtive acidic strengths of the alcohols in an increasing order is: `(CH_(3))_(3)COH lt CH_(3)CH(OH)CH_(3) lt CH_(3)CH_(2)OH lt CH_(3)OH` The acidic strength of alcohol is due to the cleavage of `O-H` bond. The alkyl group with `+I` effect tends to decreases the acidic strength. Greater the number of alkyl groups present or more the size of such groups, difficult will be the bond cleavage and thus, lesser will be the acidic strength. The order of relative acidic strength is justified. |
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| 240. |
A compound [A] gives positive iodoform test in 5 minutes. When 6.0 g of [A] is treated with sodium metal, 1120 mL of hydrogen gas is evolved at `NTP`. It is assumed that [A] contains one atom of oxygen per molecule. Further when [A] reacts with `PBr_(3)`, a compound [B] is formed which on reacting with benzene in the presence of anhydrous `AlCl_(3)` gives a compound [C]. the compound [C] is a well known industrial compound and is used in the commercial preparation of phenol. The molar mass of compound [A] is :A. `60.0" g mol"^(-1)`B. `90.0" g mol"^(-1)`C. `100.0" g mol"^(-1)`D. `120.0" g mol"^(-1)` |
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Answer» Correct Answer - A The data suggests that the compound [A] is an alcohol. `underset("2 moles")(2 ROH)+2Na rarr2RONa+underset(22400 mL)(H_(2))` 22400 mL of `H_(2)` is evolved from alcohol `=2` mol 1120 mL of `H_(2)` is evolved from alcohol `=1120/22400xx2=0.1` mol. Now, 0.1 mole of `ROH=` 6g `:.` 1.0 mole of `ROH =` 60 g |
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| 241. |
Reaction of phenol with chloroform in presence of dilute sodium hydroxide finally introduces which one of the following functional group ?A. `- COOH`B. `- CHCl_(2)`C. `- CHO`D. `- CH_(2)Cl` |
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Answer» Correct Answer - C It is the correct answer. |
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| 242. |
Phenol on heating with alc. KOH and chloroform undergoesA. Kolbe reactionB. Rosenmund reactionC. Reimer Tiemann reactionD. Cannizzaro reaction |
| Answer» Correct Answer - C | |
| 243. |
Which of the following alcohols will give iodoform test?A. MethanolB. 1-ButanolC. 1-PropanolD. 2-Butanol |
| Answer» Correct Answer - D | |
| 244. |
Which compound is predominantly formed when phenol is allowed to react with bromine in aqueous medium?A. Picric acidB. Salicylic acidC. 2,4,6-TribromophenolD. p-Bromophenol |
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Answer» Correct Answer - C 2,4,6-Tribromophenol. |
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| 245. |
Upon heating phthalic anhydride with phenol in the presence of a little conc. `H_(2)SO_(4)`........is formedA. Phthalic acidB. Phenyl acetateC. PhenolphthaleinD. Phenylphthalate |
| Answer» Correct Answer - C | |
| 246. |
Which of the following functional group can not be reduced to alcohol using sodium borohydride in the anolic solution ?A. RCHOB. `R-CO-R`C. RCOOHD. RCOCl |
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Answer» Correct Answer - C `NaBH_(4)` does not reduce `-COOH` group. |
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| 247. |
Absolute alcohol (100% alcohol) is prepared by distilling rectified spirit overA. NaB. `CaCl_(2)`C. `Mg`D. `Mg(OC_(2)H_(5))_(2)` |
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Answer» Correct Answer - D The water present in the rectified spirit is removed by `Mg(OC_(2)H_(5))_(2)` |
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| 248. |
Absolute alcohol can not be prepared from rectified spirit by simple distillation becauseA. The boiling points of water and alcohol are very closeB. Water and alcohol form a constant boiling azeotropic mixtureC. `C_(2)H_(5)OH` forms H-bonds with waterD. Alcohols molecules are highly hydrated |
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Answer» Correct Answer - B The ratio of water and alcohol in both phases (ie., vapour & liquid) is the same of the same and hence can be separated by fractional distillation. |
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| 249. |
Absolute alcohol can be obtained from rectified spirit byA. Fractional distillationB. Azeotropic distillationC. Vacuum distillationD. Steam distillation |
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Answer» Correct Answer - B Absolute alcohol can be obtained from reactified spirit by azeoptropic distillation. |
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| 250. |
Assertion : Order of reactivity of alcohols involving cleavage of `O-H` bond is, primary `gt` secondary `gt` tertiary. Reason : This is due to `+ I` effect of the alkyl group (R).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. |
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Answer» Correct Answer - A Reason is the correct explanation for assertion. |
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