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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.
| 351. |
Following conversion can be done in four steps using four reagents one after the other. These four reagents are listed below with some other reagents. Write the number of must suited reagent, in order you want to use them and present the four digit number in OMR sheet.For example if you want to use (1) than (2) than (3) than (4) fill 1234 in OMR sheet. (1) `O_(3)//Zn//H_(2)O` (2) `O_(3)//H_(2)O` (3)`conc.H_(2)SO_(4)//Delta` (4) `aq. KOH //Delta`(5) `H_(2)//Ni` (6)Zn-Hg//HCl (7) `NH_(2)-NH_(2)//EtOK` (8)`H_(3)O^(o+)` (9) `NaOH//CaO"/"triangle` |
| Answer» Correct Answer - 3145 | |
| 352. |
Select reaction with correct majoe product :A. B. C. D. |
| Answer» Correct Answer - a,b | |
| 353. |
In which of the following reaction `3^(@)` alcohol will be obtained as a product ?A. MgBr(excess)+`H-overset(O)overset(||)C-Clrarrunderset(H^(+))rarr`B. PhMgBr(excess)+`CH_(3)-overset(O)overset(||)C-Clrarrunderset(H^(+))rarr`C. `CH_(3)MgBr("excess")+CH_(3)-overset(O)overset(||)C-O-overset(O)overset(||)C-CH_(3)rarrunderset(H^(+))rarr`D. `CH_(3)MgBr("excess")+CL-overset(O)overset(||)C-O-Etrarrunderset(H^(+))rarr` |
| Answer» Correct Answer - b,c,d | |
| 354. |
Which of the folowing reaction proceeds via formation of carbacation ?A. Dehydration of alcoholsB. Pinacol-Pinacolcne rearrangementC. Diazotisetion of aliphatic aminesD. Photo halogenation of alkanes |
| Answer» Correct Answer - a,b,c | |
| 355. |
Which of the following reactions(s) follow the same pattern of energy graph for the formation of major product only ? A. B. C. D. |
| Answer» Correct Answer - a,b,c,d | |
| 356. |
major product is :A. B. C. D. |
| Answer» Correct Answer - d | |
| 357. |
Select reaction with correct major product :A. B. `PhMgBr+NH_(2)ClrarrPhNH_(2)`C. `PhMgBr+NH_(2)-O MerarrPhO Me`D. `PhMgBr+NH_(2)-OHrarrPhOH` |
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Answer» Correct Answer - b,d (a)will give `PhNH_(2)` and (c ) will gives `PhNH_(2)` |
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| 358. |
Select incorrect major product(s) :A. B. C. D. |
| Answer» Correct Answer - d | |
| 359. |
Which of the following will produce methylcyclopentanol on heating with conc. `H_(2)SO_(4)`?A. 2-cyclopentylethanolB. methylcyclohexanolC. ethylcyclopentanolD. cycclohexylmethanol |
| Answer» Correct Answer - a,b,d | |
| 360. |
In the following reaction : The major compound Y is :A. B. C. D. |
| Answer» Correct Answer - d | |
| 361. |
Match the following columns : |
| Answer» Correct Answer - a-p; b-q;c-r | |
| 362. |
Which of the following reaction (s) are correctly matched with major product ?A. `H_(3)C-O-CH_(2)-CH_(3)+PCl_(5)rarrH_(3)C-Cl+Et-Cl`B. `CH_(3)COOH+PCl_(5)rarrCH_(3)COCl`C. `MeCOMe+PCl_(5)rarrMeCH(Cl)Me`D. cyclohexanol +`PCl_(5)rarr`Cyclohexylcholoride |
| Answer» Correct Answer - a,b,d | |
| 363. |
Match the maximum number of `CH_(3)MgX` consumed, per mole, given in Column -II, when the substrates given in Column -I reacts with it. |
| Answer» Correct Answer - a-r; b-q; c-s; d-p | |
| 364. |
For substrates in column- I match the number of mol of `CH_(3)MgX` required per mol. |
| Answer» Correct Answer - a-q; b-q; c-s; d-r | |
| 365. |
Column -Iand Column -II contains four entries each. Entry of column-I are to be uniquely matched with only one entry of column-II |
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Answer» Correct Answer - a-r; b-p; c-s; d-q Size of the non-polar hydrogen part. |
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| 366. |
`CH_(3)-underset(CH_(3))underset(|)CH-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-CH_(2)-NH_(2)overset(HNO_(2))rarrX`(major) Major product of above reaction is :A. B. C. D. |
| Answer» Correct Answer - c | |
| 367. |
Solubility order in `H_(2)O` for compounds(P)`H_(2)underset(OH)underset(|)C-underset(OH)underset(|)CH-underset(OH)underset(|)CH-underset(OH)underset(|)CH_(2)` (Q)`H_(2)underset(OH)underset(|)C-CH_(2)-CH_(2)-underset(OH)underset(|)CH_(2)` (R) `H_(3)C-CH_(2)-CH_(2)-CH_(2)-OH` will be :A. P gt R gtQB. P gt Q gt RC. Q gtR gt PD. R gt Q gt P |
| Answer» Correct Answer - b | |
| 368. |
How would you get recemic mixtureof 1,2 butane siol from cis 2-butane? `CH_(3)CH=CHCH_(3)underset((ii)B)overset((i)A)rarrCH_(3)-underset(OH)underset(|)CH-overset(OH)overset(|)CH-CH_(3)` A and B are :A. `A=KMnO_(4)//OH^(-),B=H_(2)`B. `A = CF_(3)CO_(3)H,B=H_(2)O`C. `A=OsO_(4)//OH^(-),B=H_(2)O`D. `A=O_(3)//H_(2)O,B=Ph_(3)P` |
| Answer» Correct Answer - d | |
| 369. |
Wood spirit is known asA. MethanolB. EthanolC. AcetoneD. Benzene |
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Answer» Correct Answer - A Methanol is also referred to as wood alcohol or wood spirit or wood naphtha as the earliest method for its preparation was by destructive distillation of wood. |
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| 370. |
Which of the following are known as mercaptansA. Thio-alcoholsB. Thio-ethersC. Thio-acidsD. Thio-aldehydes |
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Answer» Correct Answer - A Thio alcohol is known as mercaptans. |
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| 371. |
Carbinol isA. `C_(2)H_(5)OH`B. `CH_(3)OH`C. `(CH_(3) )_(2)CHOH`D. `CH_(3)CH_(2)CH(OH)CH_(3)` |
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Answer» Correct Answer - B Carbinol is `CH_(3)OH` (Methanol). |
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| 372. |
Glycerol is aA. Primary alcoholB. Monohydric alcoholC. Secodary alcoholD. Trihydric alcohol |
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Answer» Correct Answer - D `underset(OH)underset(|)CH_(2)-underset(OH)underset(|)CH-underset(OH)underset(|)CH_(2)` Glycerol |
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| 373. |
In the reaction given below, X is Neo-pentyl alcohol `overset(H_(2)SO_(4))to X`A. 2-methypentaneB. 2-methylpent-2-eneC. 2-methylbut-2-eneD. Neo-pentane |
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Answer» Correct Answer - C `H_(3)C-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-CH_(2)-OH underset(-H_(2)O)overset(H^(+))toH_(3)C-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-overset(+)CH_(2)overset(CH_(3)^(-)"shift")toCH_(3)underset(+)overset(CH_(3))overset(|)C-CH_(2)-CH_(3)overset(-H^(+))to underset({:(2-"methyl-2-butene"),("(major product)"):})(CH_(3)-overset(CH_(3))overset(|)C=CH-CH_(3))` |
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| 374. |
Which of the following represents neo-pentyl alcoholA. `CH_(3)CH(CH_(3))CH_(2)CH_(2)OH`B. `(CH_(3))_(3)C-CH_(2)OH`C. `CH_(3)(CH_(2))_(3)OH`D. `CH_(3)CH_(2)CH(OH)C_(2)H_(5)` |
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Answer» Correct Answer - B `H_(3)C-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-CH_(2)-OH` |
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| 375. |
Rank the transition states that occur during the following reaction steps in order of increasing stability (least `rarr` stable) 1. `H_(3)C-overset(+)(O)H_(2) rarr CH_(3)^(+)+H_(2)O` 2. `(CH_(3))_(3)C-overset(+)(O)H_(2) rarr (CH_(3))_(3) C^(+) +H_(2)O` 3. `(CH_(3))_(2) CH- overset(+)(O)H_(2) rarr (CH_(3))_(2)CH^(+) +H_(2)O`A. `1 lt 2 lt 3`B. `2 lt 3 lt 1`C. `1 lt 3 lt 2`D. `2 lt 1 lt 3` |
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Answer» Correct Answer - C Rate can be explained by stability of carbocation. |
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| 376. |
In which of the following reaction hydrogen gas will not be evolved?A. `CH_(3)-CH_(2)-OH overset(Na)(rarr)`B. `CH_(3)-CH_(2)-OH overset(K)(rarr)`C. `CH_(3)-underset(CH_(3))underset(|)(CH)-OH overset(Al)(rarr)`D. `CH_(3)-underset(CH_(3))underset(|)(CH)-OH overset(CH_(3)MgBr)(rarr)` |
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Answer» Correct Answer - D `CH_(3)-underset(CH_(3))underset(|)(CH)-overset(ɵ)(O)-overset(o+)(H) overset(overset(ɵ)(CH_(3)) overset(o+)(M)gBr)(rarr)CH_(4)` (Major product) Acid -base reaction takes place. |
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| 377. |
Number of RMgX consumed per molecule with the following reactant : (a ) PhCHO ( b) `Cl-overset(O)overset(||)C-overset(O)overset(||)C-O Et` ( c) (d) `PbCl_(2)` Wright answer of part a, b, c, and d in the same order and present the four digit number as answer in OMR sheet. For example : If all these answer are 9 then fill 9999 in OMR sheet. |
| Answer» Correct Answer - 1434 | |
| 378. |
The compound that will react most readily with NaOH to form methanol is :A. `(CH_(3))_(4)N^(+)I^(-)`B. `CH_(3)OCH_(3)`C. `(CH_(3))_(3)S^(+)I^(-)`D. `(CH_(3))_(3)C Cl` |
| Answer» Correct Answer - a | |
| 379. |
How many ketones having molecular weight = 100 will react with `LiAlH_(4)` to given a product with significant optical activity ? |
| Answer» Correct Answer - 2 | |
| 380. |
4.6 g of a polydric alcohol was treated with an excess of methyl magnesium bromide to produce 3.36 liter of `CH_(4)` at STP. Calculate number of -OH(molecular weight of alcohol = 92) |
| Answer» Correct Answer - 3 | |
| 381. |
Compound which gives alcohol on reduction with `LiAlH_(4)` is/are :A. `Me-underset(O)underset(||)C-Cl`B. `Me-underset(O)underset(||)C-NH_(2)`C. D. `Me-overset(O)overset(||)C-O-overset(O)overset(||)C-Me` |
| Answer» Correct Answer - a,c,d | |
| 382. |
STATEMENT - 1 : gives turbidity with `ZnCl_(2)//HCl` in 5 minutes. STATEMENT - 2 : `2^(@)` alcohol usually gives turbidily in 5 minutes.A. Statement - 1 is true, Statement - 2 is Ture, Statement-2 is a correct explanation for Statement-1.B. Statement -1 is True , Statement -2 is False.C. Statement -1 is False , Statement -2 is True.D. Statement -1 and Statement -2 both are False. |
| Answer» Correct Answer - d | |
| 383. |
Which of the following alcohols gives the best yield of dialkyl ether on being heated with a trace of sulpuric acidA. 2-pentanolB. CyclopentanolC. 2-methyl-2-butanolD. 1-pentanol |
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Answer» 1-Pentanol Primary alcohols readily form ether when heated with conc. `H_(2)SO_(4)`. |
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| 384. |
Given are cyclohexanol `(I)`, acetic acid `(II),2,4,6-`trinitrophenol `(III)` and phenol `(IV)`. In these the order of decreasing acidic character will be:A. `III gt IV gt II gt I`B. `III gt II gt IV gt I`C. `II gt III gt I gt IV`D. `II gt III gt IV gt I` |
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Answer» Correct Answer - B Carboxylic acids are stronger acids relative to phenols which are stronger acids than aliphatic alcohols. But we can increase the acidic strength of phenols by introducing electron withdrawing groups. On account of the presence of three electron withdrawing groups. `NO_(2)` groups, the `2,4,6-`trinitrophenol is a very strong acid characterzed by a very large dissociation constant `(K_(a))`. Thus, the correct order of acidic strength is `2,4,6-`trinitrophenol `(III)` `gt` acetic acid `(II)` `gt` phenol (IV) `gt` cyclohexanol |
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| 385. |
How many `pi` electrons are there in a planar ring of phenolA. 4B. 6C. 8D. 10 |
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Answer» Correct Answer - C Electron in `pi` bonds are `pi` electrons & lone pair electrons which delocalises in the process of resonance are also counted as `pi` electrons |
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| 386. |
Ether is not formed in this reaction-A. `2C_(2)H_(5)Ohunderset(140^(@))overset(Conc.H_(2)SO_(4))to`B. `(CH_(3))_(3)C-Cl+C_(2)H_(5)ON a to`C. `C_(2)H_(5)Cl+(CH_(3))_(3)C-ON ato`D. Oxygen of ether can be replaced by chlorine when treated with `PCl_(5)` |
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Answer» Correct Answer - B `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-Cl+C_(2)H_(5)overset(ө)(O)overset(o+)(Na)toH_(3)C-underset(CH_(3))underset(||)overset(CH_(3))overset(|)(C)+C_(2)H_(5)OH+NaCl` |
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| 387. |
The acidic hydroysis of ether (X)shown below is fastest when : A. one phenyl group is replaced by a methyl groupB. one phenyl group is replaced by a paramethoxyphenyl groupC. two phenyl groups are replaced by two paramethoxyphyenyl groupsD. no structural change is made to X |
| Answer» Correct Answer - c | |
| 388. |
Diethyl ether reacts with `PCI_(5)` to fromA. ethyl chorideB. phosphorous oxy trichlorideC. 1,2-dichloro ethaneD. ethene |
| Answer» Correct Answer - a,b | |
| 389. |
How many monochloro compounds will give 1-butene on treatment with Mg/ether followed by `H_(2)O`? |
| Answer» Correct Answer - 6 | |
| 390. |
Rectified spirit obtained by fermentation contains4.5% of water. So in order to remove it, rectified spirit is mixed with suitable quantity of benzene and heated, Benzene hepls becauseA. It is dehydrating agent and so removes waterB. If forms the lower layer which retains all the water so that alcohol can be distilled offC. If forms an azeotropic mixture hivaing high boiling point and thus allows the alcohol to distill overD. It forms low boiling azeotropic mixtures wich distill over, leaving behind pure alcohol which can then be distilled |
| Answer» Correct Answer - D | |
| 391. |
Methylated spirit isA. MethanolB. Methanol+ ethanolC. Methanoic alcoholD. Methanamide |
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Answer» Correct Answer - B 5-10% methyl alcohol and remaining ethanol is called methylated spirit. It is also known as denatured alcohol because it is unfit for drinking . |
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| 392. |
Which enzyme converts glucose and fructose both into ethanolA. DiastaseB. InvertaseC. ZymaseD. Maltase |
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Answer» Correct Answer - C `underset("Glucose or Fructose")(C_(6)H_(12)O_(6))overset("Zymase")to underset("Ethyl alcohol")(2C_(2)H_(5)OH+2CO_(2))` |
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| 393. |
Which of the following is called grain alcohol ?A. EthanolB. Ethyl alcoholC. Methyl carbinolD. All of these |
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Answer» Correct Answer - D Sugars from a wide variety of sources can be used in the preparation of alcoholic beverages . Often , these sugars are form grains (such as wheat , barley, etc.)and it is this derivation that accounts for ethanol having the synonym "grain alcohol". |
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| 394. |
A mixture of benzoic acid and phenol may be separated by treatment with aquenousA. `NaaHSO_(3)` solutionB. `NaOH` solutionC. `NH_(3)` solutionD. `NaHCO_(3)` solution |
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Answer» Correct Answer - D Because phenol (weaker acid than carbonic acid) does not react with `NaHCO_(3)`. `C_(6)H_(5)OH+NaHCO_(3)rarrNO` forward reaction `C_(6)H_(5)COOH+NaHCO_(3)rarrC_(6)H_(5)COONa+H_(2)O` |
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| 395. |
The enzyme that converts cane sugar into invert sugar (a mixture of glucose and fructose) isA. maltaseB. diastaseC. invertaseD. zymase |
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Answer» Correct Answer - C The sugar in mlasses , sugarcane or fruits such as grapes is converted to glucose and fructose (both of which have the formula `C_(6)H_(12)O_(6)` ) in the presence of an enzyme, invertase. `underset("Sucrose")(C_(12))H_(22)O_(11)+H_(2)O overset("Invertase")rarrunderset("Glucose")(C_(6)H_(12)O_(6)) + underset("Fructose")(C_(6)H_(12)O_(6))` |
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| 396. |
Compound which gives alcohol on reduction is/areA. `Me-underset(O)underset(||)(C)-Cl`B. `Me-underset(O)underset(||)(C)-NH_(2)`D. `Me-overset(O)overset(||)(C)-O-overset(O)overset(||)(C)-Me` |
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Answer» Correct Answer - A::C::D `-`Alcohols have `-OH` group - Amide `(-overset(O)overset(||)(C)-NH_(2))` does not give alcohol on reduction. |
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| 397. |
Consumption of which of the following even in small dose causes blindness and may prove fall ?A. Methyl alcoholB. MethanolC. CarbinolD. All of these |
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Answer» Correct Answer - D Biological oxidation of methanol and ethanol in the body produces the corresponding aldehyde followed by the acid. At times the alcoholics , by mistake , drink ethanol, mixed with methanol also called denatured alcohol. In the body , methanol is oxidized first to methanol and then to methanoic acid, which may cause blindness and death. A methanol poisoned patient is treated by giving intravenous infusions of diluted ethanol. The enzyme responsible for oxidation of `HCHO to HCO_(2)H` is swamped allowing time for kidneys to excrete methanol. |
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| 398. |
Crushed germinated barley solution is called-A. MeshB. MaltC. WortD. Was |
| Answer» Correct Answer - B | |
| 399. |
When methane is passed in copper tube at `200^(@)C` with air, it gives.A. MethanolB. EthanolC. AcetyleneD. Ethene |
| Answer» Correct Answer - A | |
| 400. |
Which of the following alkyl halides undergoes hydrolysis with aqueous `KOH` at the fastest rate ?A. `CH_(3)overset(Cl)overset(|)(CH)CH_(3)`B. `(CH_(3))_(2)CHCH_(2)Cl`C. `CH_(3)CH_(2)CH_(2)Cl`D. `CH_(3)CH_(2)Br` |
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Answer» Correct Answer - D All are primary halides undergoing `S_(N)1` mechanism . During hydrolysis (a nucleophilic displacement) , the `C-X` bond is broken in the rate controlling step. Thus the order of reactivity (which depends upon the strength of `C-X` bond) is `R-I gt R - Br gt R - Cl gt R - F` |
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