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.
| 451. |
Acidic nature is more forA. `o-`amino phenolB. `m`-amino phenolC. `p-`amino phenolD. All have equal `K_(a)s` |
|
Answer» Correct Answer - B `-NH_(2)` is electron donating group, at meta position the donation fo electron will be least. |
|
| 452. |
The alcohols, propan-1ol and propan-2-ol are distinguished byA. oxidation with conc. `H_(2)SO_(4)` followed by reaction with Fehling solutionB. oxidation with alkaline `KMnO_(4)` followed by reaction with Fehling solutionC. reaction with iodine and aqueous NaOHD. reaction with Lucas reagent |
|
Answer» Correct Answer - C The compounds cotaining `CH_(3)-underset(OH)underset("| ")"CH"-` group are distinguished from other alcohols through iodoform test (reaction of alcohol with `I_(2)` and aq. NaOH.) `underset("Propanol")(CH_(3)-CH_(2)-CH_(2)OH)+I_(2)+NaOH overset(Delta)rarr "No reaction"` `underset("2-Propanol")(CH_(3)-underset(OH)underset("| ")"CH"-CH_(3))+4I_(2)+6NaOH overset(Delta)rarr underset("lodoform")(CHI_(3)darr)+underset("Sodium acetate")(CH_(3)COoverset(-)(O)overset(+)Na+5overset(+)(Na)overset(-)I+5H_(2)O` |
|
| 453. |
The alcohol with highest boiling point isA. `CH_(3)CH_(2)CH_(2)CH_(2)OH`B. `CH_(3)CH_(2)CH(OH)CH_(3)`C. `CH_(3)CH_(2)C(CH_(3))_(2)OH`D. `CH_(3)C(CH_(3))_(2)CH_(2)OH` |
|
Answer» Correct Answer - A Among isomeric alcohols, the boiling point decreases with increase in branching. Therefore, the alcohol with highest boiling point is `CH_(3)CH_(2)CH_(2)CH_(2)OH` |
|
| 454. |
Consider the following reaction, `Aoverset(K_(2)Cr_(2)O_(7))underset(H_(2)SO_(4))rarr"acetone"` Identify A in the above reaction.A. propan-1-olB. propan-2-olC. butan-2-olD. ethanol |
|
Answer» Correct Answer - B The given reaction can be written as `underset("(A)")underset("Propanol - 2 - ol")(CH_(3)-underset(OH)underset("| ")"CH"-CH_(3))overset(K_(2)Cr_(2)O_(7))underset(H_(2)SO_(4))rarrunderset("Acetone")(CH_(3)-underset(O)underset(||)C-CH_(3))` |
|
| 455. |
Rate of dehydration of alcohols follows the orderA. `2^(@) gt 1^(@) gt CH_(3)OH gt 3^(@)`B. `3^(@) gt 2^(@) gt 1^(@) gt CH_(3)OH`C. `2^(@) gt 3^(@) gt 1^(@) gt CH_(3)OH`D. `CH_(3)OH gt 1^(@) gt 2^(@) gt 3^(@)` |
|
Answer» Correct Answer - B The order of dehydration of alcohols is `3^(@) gt 2^(@) gt 1^(@) gt CH_(3)OH` |
|
| 456. |
Order of esterification of alcohol is `:`A. `T gt S gt P`B. `S gt T gt P`C. `P gt S gt T`D. none of these |
| Answer» Correct Answer - C | |
| 457. |
Number of isomers represented by molecular formula `C_(4)H_(10)O` is `:`A. 3B. 4C. 7D. 10 |
| Answer» Correct Answer - C | |
| 458. |
1 mole alcohol reacts with Na to give what weight of hydrogen?A. 1 gB. 2 gC. 3 gD. 3.5 g |
|
Answer» Correct Answer - A `{:(2C_(2)H_(5)OH+2Na rarr 2C_(2)H_(5)ONa+H_(2)),(" 2 mol 1 mol"),(" 1 mol "(1)/(2)"mol"):}` The weight of `(1)/(2)` mol `H_(2)=(2)/(2)g=1g` Thus, 1 g `H_(2)` is produced when 1 mole of alcohol reacts with Na. |
|
| 459. |
The hydroxyl compound that gives a precipitate immediately when treated with concentrated HCl and anhydrous `ZnCl_(2)` is `:`A. 3- methyl-2-butanolB. 3-methyl -1-butanolC. 1-butanolD. 2-methyl-2-butanol |
| Answer» Correct Answer - D | |
| 460. |
When six mole of alcohol reacts with aluminium metal. How many gram of hydrogen is liberated?A. 2B. 4C. 5D. 6 |
| Answer» Correct Answer - D | |
| 461. |
An alcohol contains `60%` carbon and `13.3%` hydrogen and givens positive idoform test. The alcohol isA. `2-`propanolB. `1-`propanolC. `2-`butanolD. `1-`butanol |
|
Answer» Correct Answer - A `C:H:O = (60)/(12):(13.3)/(1):(26.7)/(16) = (5)/(1.67):(13.3)/(1.67):(1.67)/(1.67) = 3:8:1` The formula of the compound is `CH_(3)H_(8)O`. Since the alcohol gives positive iodoform test. It has `CH_(3)-underset(H)underset(|)overset(|)C-OH`, hence it is `2`-propanol. `(underset(OH)underset(|)(CH_(3)CHCH_(3)))` |
|
| 462. |
Methoxy benzene is prepared from `CH_3-Cl` and what?A. phenolB. sodium benzoateC. sodium phenoxideD. benzyl chloride |
| Answer» Correct Answer - C | |
| 463. |
Picric acid isA. a volatile liquidB. trinitroanilineC. 2, 4, 6-trinitrophenolD. butyric acid |
| Answer» Correct Answer - C | |
| 464. |
Under different conditions nitration of phenol yieldsA. o-nitrophenolB. p-nitrophenolC. 2, 4, 6-trinitro phenolD. all of these |
| Answer» Correct Answer - D | |
| 465. |
Nitration of phenol isA. nucleophilic substitutionB. electrophilic substitutionC. eliminationD. none of these |
| Answer» Correct Answer - B | |
| 466. |
The mechanism followed when the alcoholes given below reacts with conc. HCl/anhydrous `ZnCl_(2)` `underset("(I)")(CH_(3)OH)," "underset("(II)")(CH_(3)CH_(2)OH)," "underset("(III)")(CH_(3)underset(OH)underset("| ")"CH"CH_(3))`A. `S_(N)1,S_(N)2, S_(N)2`B. `S_(N)2, S_(N)2, S_(N)1`C. `S_(N)2, S_(N)1, S_(N)1`D. `S_(N)1, S_(N)1, S_(N)2` |
|
Answer» Correct Answer - B `1^(@)` alcohol react with `S_(N)2` mechanism while `2^(@) and 3^(@)` alcohol tend to react by `S_(N)2` mechanism `S_(N)1` mechanism, respectively. |
|
| 467. |
Dimethyl ether is associated with which one of the isomer?A. EthanolB. MethanolC. Formic acidD. Methyl formate |
| Answer» Correct Answer - A | |
| 468. |
1-methoxy propane and 2-methoxy propane areA. position isomersB. chain isomersC. metamersD. functional isomers |
| Answer» Correct Answer - C | |
| 469. |
What will be the product of the following reaction ? `{:(" "CH_(3)),(" |"),(H_(3)C-C-Br+Na-O-CH_(3)rarr),(" |"),(" "CH_(3)):}`A. `{:(CH_(3)-C=CH_(2)),(" |"),(" "CH_(3)):}`B. `{:(" "CH_(3)),(" |"),(CH_(3)-O-C-CH_(3)),(" |"),(" "CH_(3)):}`C. `CH_(3)-CH_(2)-CH_(2)-CH_(3)`D. `{:(CH_(3)-CH-CH_(3)),(" |"),(" "CH_(3)):}` |
|
Answer» Correct Answer - A When tertiary alkyl halide is treated with sodium alkoxide then elimination reaction completes over substitution reaction because alkoxides are not only nucleophiles but strong base as well. Therefore, alkenes are formed instead of ethers. |
|
| 470. |
In the reaction Which of the following compound will be formed ?A. B. C. D. |
| Answer» Correct Answer - C | |
| 471. |
The compound that reacts faster with Lucas reacgent (conc.`HCl +ZnCl_(2))` at room temperature isA. butan`-1-ol`B. butan`-2-ol`C. `2-`methal`1`propan`-1-ol`D. `2-`Methylpropan`-2-ol` |
|
Answer» Correct Answer - D Tertiary alcohols rest faster with Lucas regent followed by `2^(@)` and `1^(@)` alcohols. |
|
| 472. |
A fruity smell is obtined by the reaction of ethanol withA. `CH_(3)COCH_(3)`B. `PCl_(5)`C. `CH_(3)COOH`D. `CH_(3)CHO` |
|
Answer» Correct Answer - C `"Alcohol"+"Acid" hArr" Ester (fruity smelling)"` Alcohol `(C_(2)H_(5)OH)` when reacts with acid they produce ester which have fruity smell. `underset("Ethyl alcohol")(C_(2)H_(4)OH)+underset("Acetic acid")(CH_(3)COOH)rarr underset("Fruity smell of ester")(C_(2)H_(5)COOCH_(3))+H_(2)O` |
|
| 473. |
Diethyl ether can be regarded as unhydride ofA. `CH_3-OH`B. `C_2H_5-OH`C. `C_2H_5-COOH`D. `CH_3COOH` |
| Answer» Correct Answer - B | |
| 474. |
Ethers form co-ordination complexes withA. `BF_3`B. `AlCl_3`C. `ZnCl_2`D. all of these |
| Answer» Correct Answer - D | |
| 475. |
In which of the following reaction product is t-butyl methyl etherA. `C_2H_5-OH+C_2H_5-OH overset("conc." H_2SO_4)to `B. `(CH_3)_3C-Br + CH_3O Na to`C. `CH_3-Br + (CH_3)_3C-O Na to`D. `(CH_3)_3C-Br + CH_3 - OH to ` |
| Answer» Correct Answer - C | |
| 476. |
Which of the following compound when heated with HI gives two mole of different alkyl iodide?A. `C_2H_5-OH`B. `C_2H_5-O-C_2H_5`C. `CH_3-O-C_2H_5`D. `CH_3-O-CH_3` |
| Answer» Correct Answer - C | |
| 477. |
The compound with highest boiling point isA. `CH_4`B. `CH_3OH`C. `CH_3Cl`D. `CH_3Br` |
|
Answer» Correct Answer - B Alcohols have higher boiling points than nonpolar hydrocarbon and polar haloalkane of comparable molecular masses, because alcohol molecules are associated thiough intermolecular hydrogen bonding. More the number of alkyl groups attached to the positively charged carbon, more the dispersal of positive charge and therefore, the greater is the stability of the carbonium ion. `CH_3^(+) lt R_2CH^(+) lt R_3C^+` |
|
| 478. |
The most stable carbonium ion is,A. methyl carbonium ionB. primary carbonium ionC. secondary carbonium ionD. tertiary carbonium ion. |
|
Answer» Correct Answer - D The stability of carbonium ion depends on the nature of groups attached to the positively charged caibon atom. If the alkyl groups are attached to the Positively charged carbon, the charge is dispersed by electron-donating inductive effect of alkyl group |
|
| 479. |
Which of the following is most acidic ?A. `H_2O`B. `CH_3OCH_3`C. `CH_3OH`D. `C_6H_5OH` |
|
Answer» Correct Answer - D Phenol is more acidic than all, because phenoxide ion is more stabilise by resonance than phenol |
|
| 480. |
Which of the following is less acidic ?A. B. C. D. |
| Answer» Correct Answer - B | |
| 481. |
How many alcohols with molecular formula `C_(4)H_(10)O` are chiral in nature ?A. 1B. 2C. 3D. 4 |
|
Answer» Correct Answer - A The three isomers of butanol are possible. Structural formula of these isomers are given below (i) `underset("Butan-1-ol")(CH_(3)CH_(2)-CH_(2)-CH_(2)OH)` No carbon is chiral in this compound as none of the four carbon is bonded to four different substituents. (ii) `underset("Butan-2-ol")(CH_(3)-CH_(2)-underset(OH)underset(|)overset(**)(CH)-CH_(3))` In this compound, asterisk marked carbon is chiral carbon as all four substituents, attached to it are different. (iii) `underset("2-methylpropan-2-ol")(H_(3)C-underset(OH)underset(|)overset(CH_(3))overset(|)(C)-CH_(3))` Here, again carbon is not chiral in nature. So, only one alcohol is chiral in nature and the correct option is (a). |
|
| 482. |
When t-butyl alcohol is heated with Cu at 573 K, it formsA. butanalB. propanalC. ethyl methyl ketoneD. 2-methyl prop-1-ene |
|
Answer» Correct Answer - D `(CH_3)_3COH underset"dehydration"overset"Cu 573 K"to (CH_3)_2C=CH_2+H_2O` |
|
| 483. |
Which of the following is not a characteristic of alcohol ?A. They are lighter than waterB. Their boiling points rise fairly and uniformly with rising molecular weightC. Lower members are insoluble in water and in organic solvents but the solubility regularly increases with molecular massD. Lower members have a pleasant smell and burning taste, higher members are colourless and tasteless |
|
Answer» Correct Answer - C Lower members are soluble in water as they form H-bonding with water molecular. Solubillity of alcohols in water decreases with increases in molecular masses. |
|
| 484. |
The compound which reacts faster with Lucas reagent at room temperature isA. butan-1-olB. butan-2-olC. 2-methyl propan-1-olD. 2-methyl propan-2-ol |
|
Answer» Correct Answer - D It is a tertiary alcohol and hence, is most basic. Consequently, it reacts faster with HCI in presence of `ZnCl_2` (Lucas reagent). |
|
| 485. |
Which of the following compound given yellow precipiate with `I_(2)` and `NaOH`?A. `CH_(3)CH_(2)OH`B. `CH_(3)CH_(2)CH_(2)OH`C. `C_(2)H_(5)OC_(2)H_(5)`D. `CH_(3)OH` |
|
Answer» Correct Answer - A Ethyl alcohol gives positive iodoform test (i.e. yellow ppt. with `I_(2)`and `NaOH)` `CH_(3)CH_(2)OH +4I_(2) +6NaOH rarr underset("yellow ppt.")(CHI_(3)) +5NaICOONa +3H_(2)O` |
|
| 486. |
In which of the following reactions of alcohol there is no cleavage of C-O bond ?A. Dehydration reaction of alcoholB. Oxidation reaction of alcoholC. Reduction reaction of alcoholD. Reaction of alcohol with phosphorus tribromide |
|
Answer» Correct Answer - B `3^(@)` alcohols generally do not undergo oxidation however in the presence of `KMnO_(4)`, cleavage of `C-C` bond takes place to give two acids in which `C-O` bond remains uncleaved. |
|
| 487. |
When primary alcohol is oxidised with chlorine, it producesA. `HCHO`B. `C CI_(3)CHO`C. `CH_(3)CHO`D. `C_(3)H_(7)CHO` |
|
Answer» Correct Answer - B `CH_(3)CH_(2) -OH +2CI_(2) rarr C CI_(3) - CHO` Oxidation will occur with chlorination of Methyl group. |
|
| 488. |
Which of the following statements is correct ?A. The reaction of methyl magnesium iodide with acetone followed by hydrolysis gives secondary butanol .B. Primary alcohols are dehydrated easily than secondary and tertiary alcohols .C. Tertiary alcohol is more acidic than primary alcohol .D. Tertiary butyl alcohol gives turbidity fastest with Lucas reagent . |
| Answer» Correct Answer - D | |
| 489. |
Which of the following will give benzoic acid on oxidation?A. Benzyl alcoholB. BenzaldehydeC. AcetophenoneD. All of these |
| Answer» Correct Answer - D | |
| 490. |
In the reaction the intermediate(s) is/are:A. B. C. D. |
| Answer» Correct Answer - A,C | |
| 491. |
Correct order of acidic nature is A. 2 gt 1 gt 4 gt3B. 3 gt 4 gt 2 gt 1C. 2 gt 1 gt 3 gt 4D. 3 gt 4 gt 1 gt 2 |
| Answer» Correct Answer - C | |
| 492. |
Benzoquinone is prepared by reaction of phenol withA. `Na_(2)Cr_(2)O_(7) , H_(2)SO_(4)`B. `KMnO_(4) , H_(2)SO_(4)`C. `Na_(2)CrO_(4) , HCl`D. `K_(2)MnO_(4) , H_(2)SO_(4)` |
| Answer» Correct Answer - C | |
| 493. |
P-benzoquinone is obtained from phenol byA. reductionB. oxidationC. acidic hydrolysisD. alkaline hydrolysis |
| Answer» Correct Answer - B | |
| 494. |
Decreasing order of acidic nature of following compound is A. 1 gt 2 gt 4 gt 3B. 1 gt 4 gt 3 gt 2C. 2 gt 3 gt 1 gt 4D. 2 gt 4 gt 3 gt 1 |
| Answer» Correct Answer - C | |
| 495. |
`1,2,3-`trihydroxybenzene is also known asA. phloroglucinolB. pyrogallolC. hydroxy quinolD. resorcinol |
| Answer» Correct Answer - B | |
| 496. |
Which of the following is more acidic ?A. B. C. D. |
| Answer» Correct Answer - C | |
| 497. |
Correct order of acidity of halogeneted phenol is where X-F, Cl, Br-I A. 1 gt 2gt 3 gt 4B. 4 gt 3 gt 2 gt 1C. 2 gt 3 gt 4gt 1D. 2 gt 4 gt 3 gt 1 |
| Answer» Correct Answer - C | |
| 498. |
Acidity of phenol is due toA. hydrogen bondingB. phenolic groupC. benzene ringD. resonance stabilisation of its anion |
|
Answer» Correct Answer - D All the reaction proceed by stable ions. After the losing `H^(+)` ions, phenol forms phenoxide ion. The phenoxide ions is resonance stabilised, thus makes the phenol more acidic. |
|
| 499. |
Which one of the following properties is exhibited by phenol ?A. It is soluble in aq. NaOH and evolves `CO_(2)`with aq. `NaHCO_(3)`B. It is soluble in aq. NaOH and does not evolves `CO_(2` with aq. `NaHCO_(3)`C. It is not soluble in aq. NaOH but evolves `CO_(2)` with aq. `NaHCO_(3)`D. It is insoluble in aq. NaOH and does not evolve `CO_(2)` with aq. `NaHCO_(3)` |
| Answer» Correct Answer - B | |
| 500. |
The product of the following reaction is `:` A. o-nitrophenolB. m-nitrophenolC. 2,4-dinitrophenolD. 2,4,6-trinitrophenol |
| Answer» Correct Answer - D | |