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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.
| 251. |
In order to obtain diethyl ether from ethanol, the latter is taken in-A. In equal amount of sulphuri acidB. In slightly lesser amount of sulphuric acidC. In excess amount of sulphuric acidD. in far lesser amount of sulphuric acid |
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Answer» Correct Answer - C `CH_(3)-CH_(2)-OH underset("Excess amount")overset(H_(2)SO_(4)//Delta)toCH_(3)-CH_(2)-O-CH_(2)-CH_(3)` |
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| 252. |
Dimethyl ether and ethanol has same molecular weight but boiling point of ethanol is greater than dimethyl ether, cause of this is that dimethyl ether-A. Having less no. of branchesB. Arrangemnt of hydrogen is differentC. Due to hydrogen bonding in alcoholD. None of these |
| Answer» Correct Answer - C | |
| 253. |
The electrophile involved in the following reaciton is A. formyl cation `(overset(+)(C)HO)`B. Dichlorocarbene `( :C Cl_(2))`C. Dichloromethul cation `(overset(+)(C)HCl_(2))`D. Trichloromethyl cation `( :overset(-)(C)Cl_(3))` |
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Answer» Correct Answer - B The Reimer-Tiemann reaction involves electrophilic substitution on the highly reactive phenoxide ring. The electrophilic reagent is dichlorocarbene `( :C Cl_(2))` generated from chloroform by the aciton of base: `CHCI_(3) +OH^(-)overset(rarr)underset(larr). :barC CI_(3) +H_(2)O` `: C CI_(3)^(-)overset(rarr)underset(larr). CI^(-) + : C CI_(2)` |
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| 254. |
Chlorine reacts with ethanol to giveA. EthylchlorideB. chloroformC. chloralD. acetaldehyde. |
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Answer» Correct Answer - C `CH_(3)-overset(OH)overset(|)(C)H_(2)overset(Cl_(@)//overset(ө)(OH))toCH_(3)-CHOoverset(Cl_(2)//overset(ө)(OH))toCl_(3)C-CHO` |
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| 255. |
Ethyl alcohol is heated with conc.`H_(2)SO_(4)`.The product formed isA. `C_(2)H_(6)`B. `C_(2)H_(2)`C. `H_(3)C-underset(O)underset(||)C-OC_(2)H_(5)`D. `C_(2)H_(4)` |
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Answer» Correct Answer - D It is dehydration of ethyl alcohol. `CH_(3)CH_(2)OH underset(Delta)overset(conc.H_(2)SO_(4))rarrH_(2)O + CH_(2)underset("ethene")=CH_(2)` |
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| 256. |
Ethyl alcohol is heated with conc. `H_(2)SO_(4)` . The product formed is:A. `H_(3)C-underset(O)underset(||)C-OC_(2)H_(5)`B. `C_(2)H_(2)`C. `C_(2)H_(4)`D. `(C_(2)H_(6)` |
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Answer» Correct Answer - C `C_(2)H_(5)OH overset(Conc.)underset(H_(2)SO_(4))rarr CH_(2)=CH_(2)+H_(2)O`. |
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| 257. |
The`-OH` group of Methyl alcohol cannot be replaced by chlorine by the the action ofA. ChlorineB. Hydrogen chlorideC. Phosphorus trichlorideD. Phosphorus pentachloride |
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Answer» Correct Answer - A `PCl_(3),PCl_(5),SOCl_(2),HCl` can replace `-OH` group but not `Cl_(2)`. |
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| 258. |
Ethyl alcohol (in excess) is heated with concentrated `H_(2)SO_(4)` at `40^(@)C`. On distillation, the major product that separates out isA. diethyl sulphateB. ethyl hydrogen sulphateC. etheneD. ethoxyethane |
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Answer» Correct Answer - D When a mixture of ethyl alcohol (in excess) and conc. `H_(2)SO_(4)` is heated to a tempreture to a temperature below that required to form ethene, intermolecular dehydration occurs instead of intramolecular dehydration. `CH_(3)CH_(2)-OH+H-OCH_(2)CH_(3)overset(Conc. H_(2)SO_(4))(rarr)CH_(3)CH_(2)-O-CH_(2)CH_(3)+H_(2)O` The ether always has a lower boiling point than the parent alcohol and is distilled off as it forms. |
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| 259. |
Under suitable conditions `C_(6)H_(5)CH_(2)OH(A)C_(6)H_(5)OH(B) and C_(6)H_(5)COOH(C)` can act as acids. The increasing order of their acidic strength is-A. AltBltCB. AltCltBC. BltAltCD. CltBltA |
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Answer» Correct Answer - A Acidic nature of `Ph-COOH` is more than `Ph-OH` than because the stability of conjugate base of Ph-COOH is more stable tha Ph-OH and that Ph-OH is more than benzyl alcohol `Pb-CH_(2)-OH`. |
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| 260. |
How can you convert `PhCH=CHCOCH_(3)` to (i). `PhCH=CHCO_(2)H` (ii). `PhCH=CHCH_(2)CH_(3)` (iii). `PhCH_(2)CH_(2)CH_(2)CH_(3)` (iv). `PhCH=CHCH(OH)CH_(3)` (v) `PhCH_(2)CH_(2)COCH_(3)` |
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Answer» (i). `I_(2)+NaOH` (ii). `N_(2)H_(4)+OH^(ө),Delta` (iii). `Zn(Hg)//HCl` (iv). `9BBN` (v). `N_(2)H_(4),H_(2)O_(2)//Delta` |
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| 261. |
What reagents could you use for te following conversions. (a). `MeCO(CH_(2))_(2)CO_(2)EttoMeCHOH(CH_(2))_(2)CO_(2)Et` (b). `HO_(2)C(CH_(2))_(4)COCl to HO_(2)C-(CH_(2))_(4)CH_(2)OH` (c). `O_(2)N(CH_(2))_(2)CNtoO_(2)N(CH_(2))_(2)CH_(2)NH_(2)` (d). `O_(2)N(CH_(2))_(2)CH=CH_(2)toH_(2)N(CH_(2))_(2)CH=CH_(2)` (e). `Me_(2)CHCOCltoMe_(2)CHCHO` (f). `O_(2)N(CH_(2))_(3)CHOtoO_(2)N(CH_(2))_(3)CH_(2)OH` (g). `O_(2)N(CH_(2))_(2)CH=CH_(2)toO_(2)N(CH_(2))_(3)CH_(3)` |
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Answer» (a) `NaBH_(4)` (b). `NaBH_(4)` (c). `Na+C_(2)+C_(2)H_(5)OH` (d). `LiAlH_(4)` (e). `H_(2)-Pd//BaSO_(4)` (f). `NaBH_(4)` (g). `N_(2)H_(4)+H_(2)O_(2),Delta` |
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| 262. |
Carbylamine test is performed in alc . ` KOH` by heating a mixture of :A. Chloroform and silver powderB. Trihalogen methane and primary amineC. Alkyl halide and priamry amineD. Alkyl cyanide and priamry amine |
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Answer» Correct Answer - B Carbylamine reaction `CHCl_(3)+CH_(3)NH_(2) + underset("alc.")(3KOH) to underset({:("Methyl "),("isocyanide"):})(CH_(3)N)overset(to)(=)C+3KCl+3H_(2)O` |
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| 263. |
`CH_(3)CH_(2)CH_(2)OHoverset(PBr_(5))rarr(A)overset(KOH(Alc))rarr(B)overset(HBr)rarr(C)overset(NH_(3))rarr(D)` |
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Answer» (A) `C_(3)H_(7)Br` (B). `CH_(3)CH=CH_(2)` (C). `CH_(3)CHBrCH_(3)` (D). `CH_(3)CHNH_(2)CH_(3)` |
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| 264. |
The `IUPAC` name of `CH_(3)OCH_(2)CH_(2)OCH_(2)CH_(2)OCH_(2)CH_(3)` isA. `3,6,9-`trioxadecaneB. ethoxy methoxy diethyl etherC. ethoxymethyl methoxyethyl etherD. `2,5,8-`trioxdecane |
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Answer» Correct Answer - D The oxa method pretends that the oxygen atom of the longest chain or ring. Its presence is indicated by the prefix oxa-and a number to designate its position in the chain or ring. `underset(2,5,8-"Trioxadecane")(overset(1)(C )H_(3)overset(2)(O)overset(3)(C )H_(2)overset(4)(C )H_(2)overset(5)(O)overset(6)(C )H_(2)overset(8)(O)overset(9)(C )H_(2)overset(10)(C )H_(3))` |
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| 265. |
`CH_(3)OCH_(3)` is a gas at room temperature while its isomer `CH_(3)CH_(2)OH` is a liquid of boiling point `78^(@)C` this is due to the fact thatA. the `CH_(3)-`group has weaker `+1`effect than the `CH_(3)CH_(2)^(-)` group.B. lone pair of electrons of `CH_(3)OCH_(3)` participates in resonance but that in `CH_(3)CH_(2)OH` does not.C. `CH_(3)OCH_(3)` cannot undergo molecular association as its hydrogens are all attached to carbon while `-OH` of `CH_(3)CH_(2)OH` permits association of a alcohol molecules.D. `C_(2)H_(5)OH` forms intramolecular hydrogen bonds while `C_(2)H_(5)OH` forms intermolecular hydrogen bonds. |
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Answer» Correct Answer - C `RHO` molecules have strong intermolecular attractive forces because of the `H-`bonding that is absent in ether molecules. Thus ethers have much lower boiling points. However, both from `H-`bonds with water and their solubility are comparable. In both cases as the `R` portion (the hydrophobic moiety) increases, the solubility in water decreases. |
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| 266. |
Consider the following reaction :s ethonal `overset(PBr_(3))to X overset(alc. KOH)to Yunderset((ii)H_(2)O, "heat")overset((i) H_(2)SO_(4) " room temperature")to Z,` product Z isA. `2CO_(2)`B. `2HCOOH`C. `underset(CHO)underset(|)CHO`D. |
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Answer» Correct Answer - D `{:(CH_(2)OH),(" |"" "overset(HIO_(4))toCH_(2)O+CH_(2)O),(CH_(2)OH):}` |
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| 267. |
Anisole `underset(AlCl_(3))overset((Ch_(3))_(3)"CC"l)tooverset(Cl_(2)//FeCl_(3))to underset("heat")overset(HBr)to X`The product X in the above series of reaction isA. B. C. D. |
| Answer» Correct Answer - D | |
| 268. |
Consider the following reactions `CH_(3)CH=CH_(2)overset(1.(CH_(3)COOH)_(2)Hg.CH_(3)OH)underset(2.NaBH_(4))rarr`A. `{:(CH_(3)CH-CH),(" | |"),(CH_(3)COO " "OCOCH_(3)):}`B. `CH_(3)-underset(CH_(3))underset(|)(C )H-O-overset(O)overset(||)(C )-CH_(3)`C. `CH_(3)underset(CH_(3))underset(|)(C )H-O-CH_(3)`D. `{:(CH_(3)CH-CH_(2)OCOCH_(3)),(" "|),(" "OCH_(3)):}` |
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Answer» Correct Answer - C This is alkoxymercuration-demercuration `CH_(3)CH=CH_(2)-overset((CH_(3)COO)_(2)Hg)underset(CH_(3)OH)(rarr)` `{:(CH_(3)CH-CH_(2)overset(NaBH_(4))rarrCH_(3)CHCH_(3) ),(" | | |"),(""OCH_(3)" "HgOOC CH_(3)" "OCH_(3)):}` |
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| 269. |
The major product formed in the reaction `CH_(3)CH = CH - overset(O)overset(||)(C ) - CH_(3)underset(H_(2)O,CH_(3)OH)overset(NaBH_(4))rarr` isA. `CH_(3)CH = CHCH(OH)CH_(3)`B. `CH_(3)CH_(2)CH(OH)CH_(3)`C. `CH_(3)CH_(2)overset(OH)overset(|)(CH)COCH_(3)`D. `CH_(3)CH_(2)CH_(2)COCH_(3)` |
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Answer» Correct Answer - A Sodium borohydride does not reduce the carbon-carbon double bond but reduces the ketone to secondary alcohol `CH_(3)CH = CHCH(OH)CH_(3) underset(H_(2)O,CH_(3)OH) overset(NaBH_(4))larr` `CH_(3)CH = CH -overset(O) overset(||)(C)-CH_(3)` |
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| 270. |
The `IUPAC` name of `CH_(3)-Ounderset(CH_(3))underset(|)overset(CH_(3))overset(|)(C )-CH_(2)CH_(3)` isA. `2-`ethyl`-2-`methoxypropaneB. methyl `t-`pentyl etherC. `2-`methoxy`-2-`methylbutaneD. `1-`methoxy`-1`, `1-`dimethylpropane |
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Answer» Correct Answer - C In `IUPAC` system, the ethers are regarded as hydrocarbons in which a hydrogen atom is replaced by an alcocyl group, `-OR`, the larger group being chosen as the parent alkane. `underset(2-"Methoxy-2-methylbutane")(CH_(3)-O-underset(CH_(3))underset(|)overset(1CH_(3))overset(2|)(C )-overset(3)(C )H_(2)overset(4)(C )H_(3))` |
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| 271. |
The role of conc. `H_(2)SO_(4)` in the esterification process isA. CatalystB. Dehydrating agentC. Hydrolysing agentD. Dehydrating agent & catalyst |
| Answer» Correct Answer - D | |
| 272. |
Reaction : `CH_(3)OH+O_(2) underset(Ag)overset(600^(@))to` product The product isA. `CH_(2)=C=O`B. `H_(2)C=O`C. `C_(2)H_(4)`D. `C_(2)H_(2)` |
| Answer» Correct Answer - B | |
| 273. |
`CH_(2)=CH_(2)+B_(2)H_(6) underset(NaOH)overset(H_(2)SO_(4))to` Product Product in above reaction isA. `CH_(3)CH_(2)CHO`B. `CH_(3)CH_(2)OH`C. `CH_(3)CHO`D. None of above |
| Answer» Correct Answer - B | |
| 274. |
Acid catalyzed hydration of alkenes except ethene leads to the formation ofA. Primary alcoholB. Secondary and tertiary alcoholC. Mixture of primary and secondary alcoholsD. Mixture of secondary and tertiary alcohols |
| Answer» Correct Answer - B | |
| 275. |
Cresol hasA. Alcoholic -OHB. Phenolic -OHC. `-COOH`D. `-CHO` |
| Answer» Correct Answer - C | |
| 276. |
Match the list I and list II and pick the correct matching from the codes given below A. A-1,B-2,C-3,D-4,E-5B. A-1,B-3,C-5,D-4,E-2C. A-3,B-2,C-4,D-5, E-1D. A-3,B-5,C-1,D-2,E-1 |
| Answer» Correct Answer - D | |
| 277. |
Which of the following are a general group with an `OH` attached to a carbocyclic aromatic ring ?A. AlcoholsB. EnolsC. PhenolsD. Napthols |
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Answer» Correct Answer - C `ArOH`. Specifically, `Ar` is a phenyl ring for phenols . The compound with the specific name phenol is `C_(6)H_(5)OH`.Naphthols are phenolic -type compounds where `Ar` is a naphthyl ring `(NapOH)`. Alcohols have an `OH` bonded to an `sp^(3)` hybridized carbon `(-underset(|)overset(|)(C)-OH)`.Enols have an `OH` bonded to a vinyl group `(-overset(|)(C)=overset(|)(C)-OH)`. |
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| 278. |
Explain how does the `(---OH)` group attached to a carbon of benzene ring activate it towards electophililc substitution. |
| Answer» Phenol may be regarded as a resonance hybrid of structures, I-V as shown in Section `12.10` (b). As a result of `+R` effect of the `(OH)` group, the electron density in the benzene ring increases, thereby facilitating the attack by an electophile. In other words, the presence of `(OH)` group activates the benzene ring towards electrophilic substitution reactions. Further, since the electron density is relatively higher at the two o- and p-position, therefore, electrophilic substitution occurs mainly at o-and p-position. | |
| 279. |
An oxygen containing organic compound upon oxidation forms a carboxylic acid as the only organic product with its molecular mass higher by 14 units. The organic compound isA. An aldehydeB. A primary alcoholC. A secondary alcoholD. A ketone |
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Answer» Correct Answer - B `underset(46 g)(CH_(3)CH_(2)OH)overset([O])to underset(60g)(CH_(3)COOH)` |
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| 280. |
Fats, on alkaline hydrolysis , givesA. OilsB. SoapsC. DetergentsD. Glycol + acid |
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Answer» Correct Answer - B Fats are esters of higher fatty acids with glycerol , hence on alkaline hydrolysis they give back glycerol and sodium or potassium salt of acid (this is called soap). `{:(CH_(2)OCOR" "CH_(2)OH),(|" "|),(CHOCOR+3NaOH to CHOH + underset("Soap")(3RCOONa)),(|" "|),(underset("Fat")(CH_(2)OCOR)" "CH_(2)OH):}` |
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| 281. |
Which alcohol reacts with fatty acids to form fatsA. EthanolB. GlycerolsC. MethanolD. Isopropanol |
| Answer» Correct Answer - B | |
| 282. |
Which of the following react with benzoic acid to form ethyl benzoateA. Ethyl alcoholB. Cinnamic acidC. Sodium ethoxideD. Ethyl chloride |
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Answer» Correct Answer - B When benzoic acid reacts with ethyl alcohol in the presence of sulphuric acid ethyl benzoate is formed. This is known as esterfication. `underset("Benzoicacid")(C_(6)H_(5)COOH)+underset("Ethylalcohol")(C_(2)H_(5)OH)overset(H_(2)SO_(4))to underset("Ethyl benzoate ")(C_(6)H_(5)COOC_(2)H_(5))+ underset("Water")(H_(2)O)` |
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| 283. |
The reaction between an ester and excess of Grignard reagent shall finally result in aA. Primary alcoholB. Secondary alcoholC. Tertiary alcoholD. Ketone |
| Answer» Correct Answer - C | |
| 284. |
HBr reacts faster with:A. 2-Methyl propan-2-olB. propaan-1-olC. Propan-2-olD. 2-Methyl propan-1-ol |
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Answer» Correct Answer - A Reactivity of alcohol with HBr is `3^(@)gt2^(@)gt1^(@)` , (a) is `3^(@)` alcohol. |
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| 285. |
Hydrogen bonding is maximum in:A. EthanolB. Diethyl etherC. Ethyl chlorideD. Triethyl amine |
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Answer» Correct Answer - A H-bonding is maximum in ethanol because H is bonded to high EN element, i.e., O atom. |
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| 286. |
A compound with the formula `C_(4)H_(10)O` yields another compound `C_(4)H_(8)O`, on heating with `K_(2)Cr_(2)O_(7)` and `H_(2)SO_(4)`. The compound `C_(4)H_(10)O` is expected to beA. `CH_(3)CH_(2)CHOHCH_(3)`B. `CH_(3)CH_(2)CH_(2)CH_(2)OH`C. `(CH_(3))_(2)CHCH_(2)OH`D. `(CH_(3))_(3)C-OH` |
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Answer» Correct Answer - A `underset((C_(n)H_(2n+2)O))(C_(4)H_(10)O)overset([O])(rarr)underset((C_(n)H_(2n)O))(C_(4)H_(8)O)` The general formula, `C_(n)H_(2n+2)O`, corresponds to a monohydric alcohol. A `1^(@)` alcohol is oxidized to a carboxylic acid `(C_(n)H_(2n)O_(2)),2^(@)` alcohol is oxidized to a keton e`(C_(n)H_(2n)O)` while `3^(@)` alcohol is oxidized to a mixture of ketone and acid, each contaning fewer carbon atoms than the original alcohol `CH_(3)CH_(2)underset((C_(4)H_(10)O))(CH)(OH)CH_(3)overset([o])(rarr)underset((C_(4)H_(8)O))(CH_(3)CH_(2)COCH_(3))` |
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| 287. |
The maximum number of moles of isopropyl alcohol that can be oxidized to acetone by one mole of `K_(2)Cr_(2)O_(7)` in the presence of `H_(2)SO_(4)` isA. fourB. oneC. twoD. three |
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Answer» Correct Answer - D `CH_(3)-underset(OH)underset(|)overset(O)(CH)-CH_(3) rarr CH_(3)-underset(O)underset(||)overset(+2)(C)-CH_(3)` `overset(+6)(C)underset((+12))(r_(2)O_(7)^(2-))rarr2underset((+6))overset(+3)(C)r^(3+)` Since `1 ` mole of `K_(2)Cr_(2)O_(7)` can accept `6` moles of `e^(-)s` (as `O.N`. of `Cr`changes by `6` units from `+12` to `+6`), three moles of isopropyl alcohol can be oxidized to acetone as each mole loses `2e^(-)` (as `O.N. of C` changes by `2` units). |
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| 288. |
A tetrahydric alcohol with the formula `C_(5)H_(12)O_(4)` has all of its alcoholic functions primary. The `IUPAC` name of the alcohol isA. `2,2`-bis(hydroxmethyl) propane -`1,3`-diolB. `1,2,3,4,5`-pentaneterolC. `2`-methyl-`1,2,3,4`-butanetetraolD. `1,2,3,4`-pentanetraol |
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Answer» Correct Answer - A A tetrahydric alcohol with the formula `C_(5)H_(12)O_(4)` having all of its alcoholic functions primary has the following structure : `HOH_(2)overset(1)(C)-underset(2,2-"Bis"("hydroxymethyl")"propane")(underset(CH_(2)OH)underset(|)overset(CH_(2)OH)overset(|2)(C)-overset(3)(CH_(2)OH))` |
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| 289. |
An alcohol , `C_(3)H_(8)O_(3)` , which is used as a humectant (moistening agent) for domestic purposes , isA. glycerolB. ethylene glycolC. trimethylene glycolD. propylene glycol |
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Answer» Correct Answer - A Because of its hygroscopic properties , glycerol is used as a moistening agent for tobacco , shaving soaps , etc. |
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| 290. |
Which of the following is a very good ethylating agent for converting `R-OH` into `R-Oet`?A. `Et-(3)overset(+)(O)bar(B)F_(4)`B. `Et_(2)O`C. `Et_(2)overset(+)(O)-bar(B)F_(3)`D. `C_(2)H_(5)OH` |
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Answer» Correct Answer - A Trialyloxonium fluoroborates, `R_(3)overset(+)(O)bar(B)F_(2)` are powerful alkylating reagents for nucleophilic substrates such as alcohol. `RO-H overset(Et_(3)overset(+)(Obar(B)F_(4)))rarr RO - Et` |
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| 291. |
The alcohol which gives the most stable carbocation during dehydration isA. `2-`methylpropan`-2-ol`B. `2-`methylpropan`-1-ol`C. butan`-1-ol`D. butan`-2-ol` |
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Answer» Correct Answer - A The most stable carbocation comes from `3^(@)` alcohol. `CH_(3)-underset(3^(@)alcohol)underset(OH)underset(|)overset(CH_(3))overset(|)(C )-CH_(3)overset((1)H^(+))underset((2)-H_(2)O)(rarr)underset(3^(@)"carbocation")(CH_(3)-overset(CH_(3))overset(|)underset(+)(C)-CH_(3))` |
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| 292. |
The reagent most suitable for converting a primary alcohol into an aldeyde isA. `HNO_(3)`B. `KMnO_(4)` and `NaOH`C. D. `K_(2)Cr_(2)O_(7)` and `H_(2)SO_(4)` |
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Answer» Correct Answer - C The oxidant pyridinium chlorochromate `(PC C)` , made by mixing equimolar amounts of `CrO_(3),HCl` and pyridine , is used to oxididize a `1^(@)` alcohol to an aldehyde. It is soluble in `CH_(2)Cl_(2)` and other stable to further oxidation. |
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| 293. |
Assertion (A): The major products formed by heating with HI are: Reason (R ): Benzyl carbocation is more stable.A. If both (A) and (R ) are true and (R ) is the correct explanation of (A).B. If both (A) and (R ) are true but (R ) is not the correct explanation of (A).C. If (A) is true but (R ) is false.D. If both (A) and (R ) are false. |
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Answer» Correct Answer - A Both (A) and (R ) are correct. |
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| 294. |
Which of the following reagent is the most suitable for converting benzyl alcohol into benzaldehydeA. `KMnO_(4),NaOH`B. `K_(2)Cr_(2)O_(7),H_(2)SO_(4)`C. `CrO_(3),CH_(3)COOH`D. `MnO_(2)` |
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Answer» Correct Answer - D `MnO_(2)` selectively oxidizes the `OH` group of allylic and benzlic `1^(@)` and `2^(@)` alcohols to give aldehydes and ketones : `C_(6)H_(5)CH_(2)OH overset(MnO_(2))rarr C_(6)H_(5)CHO` |
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| 295. |
Benzyl alcohol and phenol can be distinguished by usingA. `CH_(3)MgI//`etherB. `Na`C. `CH_(3)COCl//`pyridineD. `FeCl_(3)` solution |
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Answer» Correct Answer - D Only phenol gives violet color with neutral `FeCl_(3)` solution. `underset("phenol")(3C_(6)H_(5)OH+FeCl_(3))"-----------"underset(("Violet"))underset("Ferric phenoxid")((C_(6)H_(5)O)_(3)Fe+3HCl)` Both react with `Na` to to librate `H_(2)`, with `CH_(3)COCl//`pyridine to form ester and with `CH_(3)MgI//`ether to form `CH_(4)`. `c_(6)H_(5)OH overset(CH_(3)COCl)underset("pyridine")(rarr)underset("phenylacetate")(C_(6)H_(5)O-overset(O)overset(||)(C )-CH_(3))` |
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| 296. |
The crow ether is a heterocyclic polyether, usually with at least "___________" oxygen atoms.A. fourB. threeC. sixD. five |
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Answer» Correct Answer - A Crown ethers are cyclic polyethers containing four or more ether linkage in a ring of twelve or more atoms. Crown ethers are given this name because their molecular models resemble crowns. |
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| 297. |
Absolute ether isA. dimethyl etherB. ethyl methyl etherC. diethyl etherD. diphenyl ether |
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Answer» Correct Answer - C Diethyl ether is often just called ether. Absolute means it is absolutly free of water i.e., it is anhydrous. To keep an opened container of ether from absorbing water, a sodium wire is introduced. On opening the container, any entering water valpour will react with the `Na` metal. |
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| 298. |
The ether in which all atoms exist in one plane isA. B. C. D. |
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Answer» Correct Answer - B `{:(sp^(2),sp^(2),sp^(2),sp^(2)),(CH_(2)=,CH-O-,CH,=CH_(2)):}` Since every carbon atom is `sp^(2)` hybridized (planar hybridization), all atoms exist in one plane. In other ethers, at least one atom is `sp^(3)` hybridized (tetrahedral hybridization). |
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| 299. |
Mojar product is :A. B. C. D. |
| Answer» Correct Answer - d | |
| 300. |
Glycerol `underset(/_)overset(KHSO_(4))rarr A` A is :A. acroleinB. glycery sulphateC. allyl alcoholD. acrylic acid |
| Answer» Correct Answer - a | |