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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.
| 851. |
When `H_(2)C=CH-O-CH_(2)CH_(3)` reacts with one molre of HI, one of the product formed is `,`A. ethaneB. ethanolC. iodoethaneD. ethanal |
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Answer» Correct Answer - C Allyl ethyl ether on reaction with HI produces ethanal and ethyl iodide by nucleophilic substitution reaction as shown below `CH_(2)=CH-O-CH_(2)-CH_(3)overset(H^(+)I^(-))rarr CH_(3)CH_(2)l+CH_(3)CHO` |
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| 852. |
List the hydrogen halide acids in decreasing order of reactivity in the following reaction `R-OH + HX to RX + H_2O`A. HBr gtHI gtHClgtHFB. HIgtHBrgtHClgtHFC. HIgt HFgt HBr gt HClD. HIgt HCI gt HBr gt HF |
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Answer» Correct Answer - B The relative rate follows same order as of acidity (HI gt HBr gtHClgt HF) and the nucleophilicity of their coniugate anion, X- `(I^(-) gt Br^(-) gt Cl^(-) gt F^(-))` |
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| 853. |
Assertion: equimolar mixture of conc. `HCI` and anhydrous zinc chloride is called Lucas reagent. Reason: Lucas reeagent can be used to distinguish between methanol and ethanol.A. If both assertion and reason are true and the reason is the correct explanantion of the assertion.B. If both assertion and reason are true but reason is not the correct explanantion of the asseriton.C. If assertion is true but reason is false.D. If assertion if false but reason is ture. |
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Answer» Correct Answer - C Correct Reason: Both methanol and ethanol are `1^(@)` alcohol and hence cannot be distinhuished by Lucas reagnet. |
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| 854. |
Assertion: Alcohols have higher boiling points than ethers of comparable molecular masses. Reason: Alcohols and ethers are isomerism in nature.A. If both assertion and reason are true and the reason is the correct explanantion of the assertion.B. If both assertion and reason are true but reason is not the correct explanantion of the asseriton.C. If assertion is true but reason is false.D. If assertion if false but reason is ture. |
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Answer» Correct Answer - B Correct explantion. Alcohols have higher boiling point than isomeric ethers due to presence of intermolecular `H-`bonding in alcohols but not in ethers. |
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| 855. |
Which of the following alcohol reacts with HI by `SN^1` reaction ?A. t-butyl alcoholB. methyl alcoholC. n-propyl alcoholD. ethyl alcohol |
| Answer» Correct Answer - A | |
| 856. |
When `H_(2)C=CH-O-CH_(2)CH_(3)` reacts with one molre of HI, one of the product formed is `,`A. ethaneB. ethanolC. iodoetheneD. ethanal |
| Answer» Correct Answer - D | |
| 857. |
(A) Glycol reacts with HI to give ethylene. (R ) Initially ethylene di-iodide is formed which being unstable loses a molecule of `I_(2)` and forms ethylee.A. If both (A) and (R ) are correct and (R ) is correct explanation of (A ).B. If both (A ) and (R ) are correct but (R ) is not correct explanation of (A ).C. If (A) is correct but (R ) is incorrectD. If (A) is incorrect but (R ) is correct. |
| Answer» Correct Answer - A | |
| 858. |
The reactivity of halogen acids with ether follos the order `:`A. `HI gt HBrgt HCl`B. `HClgtHBrgtHI`C. `HBrgtHIgtHCl`D. `HClgtHIgtHBr` |
| Answer» Correct Answer - A | |
| 859. |
Assertion: Anisole undergoes eletctrophilic substitution at `o-`and `p-`positions. Reason: Anisole is less reactive than phenol towards electrohphilic substitution reactions.A. If both assertion and reason are true and the reason is the correct explanantion of the assertion.B. If both assertion and reason are true but reason is not the correct explanantion of the asseriton.C. If assertion is true but reason is false.D. If assertion if false but reason is ture. |
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Answer» Correct Answer - B Correct explanation. `OCH_(3)` group is `o,p-`directing. |
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| 860. |
Assertion: Anisole undergoes eletctrophilic substitution at `o-`and `p-`positions. Reason: Anisole is less reactive than phenol towards electrohphilic substitution reactions.A. if both assertioon and reason are true and reason is the corrct explanation of assertion.B. If both assertion and reason are ture but reason is not the corrcet explanation of assertion.C. If assertion is true but reason is false .D. if both assertion and reason are false. |
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Answer» Correct Answer - C Methoxy group in anisole is orhto, pra directing and activates athe aromatic ring towards electrophilic substitution in the same way as in phenol. |
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| 861. |
Phenol is more reactive than benzene towards electrophilic substitution reaction. In case of Phenol, the intermediate carbocation is more resonance stabilised.A. If both assertion and reason are true and the reason is the correct explanantion of the assertion.B. If both assertion and reason are true but reason is not the correct explanantion of the asseriton.C. If assertion is true but reason is false.D. If assertion if false but reason is ture. |
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Answer» Correct Answer - A It is correct that phenol is more reactive than benzene. |
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| 862. |
Ethyl bromide can be converted into diethyl ether by `:`A. reacting with sodium ethoxideB. heating with moist silver oxideC. heating with dry silver oxideD. treating with `C_(2)H_(5)MgBr` |
| Answer» Correct Answer - A::C | |
| 863. |
Major product of following reaction is A. B. C. D. |
| Answer» Correct Answer - C | |
| 864. |
Phenetole reacts with HI to produce `:`A. `C_(6)H_(5)I+CH_(3)CH_(2)OH`B. `CH_(3)CH_(2)I+C_(6)H_(5)OH`C. `C_(6)H_(5)CH_(2)+CH_(3)CH_(2)I`D. `C_(6)H_(5)OH+CH_(3)CH_(2)OH` |
| Answer» Correct Answer - B | |
| 865. |
Phenetole react with cold HI givesA. `C_6H_5-I+C_2H_5-OH`B. `C_2H_5-I+C_6H_5-OH`C. `C_6H_5CH_2-OH+C_2H_5-I`D. `C_6H_5-OH + CH_3-CH_2-CH_2OH` |
| Answer» Correct Answer - B | |
| 866. |
Assertion: Anisole undergoes eletctrophilic substitution at `o-`and `p-`positions. Reason: Anisole is less reactive than phenol towards electrohphilic substitution reactions.A. If both (A) and (R ) are correct and (R ) is correct explanation of (A ).B. If both (A ) and (R ) are correct but (R ) is not correct explanation of (A ).C. If (A) is correct but (R ) is incorrectD. If (A) is incorrect but (R ) is correct. |
| Answer» Correct Answer - B | |
| 867. |
IUPAC name of ethyl isopropyl etherA. 2-ethoxypropaneB. 1-ethoxypropaneC. 2-methyl- 2-ethoxypropaneD. 1-methyl- 2-ethoxypropane |
| Answer» Correct Answer - A | |
| 868. |
IUPAC name of ethyl t-butyl ether isA. 2-ethoxypropaneB. 2-ethoxy -2-methylpropaneC. 2-ethoxy -2, 2-dimethylethaneD. 2-ethoxy -1-methylpropane |
| Answer» Correct Answer - B | |
| 869. |
The Williamson ether synthesis follows the following mechanism-A. Nucleophilic substitutionB. Nucleophilic additionC. Electrophilic additionD. Electrophilic substitution |
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Answer» Correct Answer - D Factual |
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| 870. |
Rectified spirit can be dried with `:`A. conc. `H_(2)SO_(4)`B. CaOC. anhydrous `CaCl_(2)`D. slaked lime |
| Answer» Correct Answer - B | |
| 871. |
(A) Phenetole on clearvage with HI yields phenol and ethyl iodide (R ) Phenetole is a mixed aromatic ether.A. If both (A) and (R ) are correct and (R ) is correct explanation of (A ).B. If both (A ) and (R ) are correct but (R ) is not correct explanation of (A ).C. If (A) is correct but (R ) is incorrectD. If (A) is incorrect but (R ) is correct. |
| Answer» Correct Answer - B | |
| 872. |
IUPAC name of ether isA. alkyl alkanoateB. alkoxy alkaneC. alkanamineD. alkyl acetate |
| Answer» Correct Answer - B | |
| 873. |
In Williamson reaction intermediate formed isA. carbocationB. free radicalC. carbanionD. T.S |
| Answer» Correct Answer - D | |
| 874. |
Which is the most stable ion is formed in the protonation of `(CH_3)_3C-O-CH_2CH_3`A. `(CH_3)_3C-undersetunderset(H)|overset(o+)O-CH_2CH_3`B. `(CH_3)_3C^+`C. `CH_3-CH_2^+`D. None of these |
| Answer» Correct Answer - B | |
| 875. |
IUPAC name of methyl n-propyl ether isA. propoxymethylB. 2-methoxy propaneC. 1-methoxypropaneD. methylpropaonate |
| Answer» Correct Answer - C | |
| 876. |
Rectified spirit contains `:`A. `75%` alcoholB. `95.5%` alcoholC. `56%` alcoholD. `100%` alcohol |
| Answer» Correct Answer - B | |
| 877. |
Which one of the following statement is not true regarding ether ?A. These are Lewis basesB. They are highly inflammable.C. They on acid hydrolysis gives alcohol.D. These are Lewis acid |
| Answer» Correct Answer - D | |
| 878. |
Consider following reactions : III.`(CH_3)_3C-Cl + CH_3ONa to` IV. `(CH_3)_3C-O Na + CH_3Cl to ` Which of the above methods cannot be used in the synthesis of either ?A. I, IVB. I, IIIC. II, IVD. II, III |
| Answer» Correct Answer - D | |
| 879. |
IUPAC name of `CH_3-O-C_2H_5` isA. ethoxymethaneB. methoxymethaneC. methoxyethaneD. ethylmethylether |
| Answer» Correct Answer - C | |
| 880. |
Which of the following is an alkoxide ?A. `H_(2)C=CH_(2)`B. `CH_(3)MgI`C. `(CH_(3)CO)_(2)O`D. `CH_(3)CH_(2)CH_(2)ONa` |
| Answer» Correct Answer - D | |
| 881. |
Consider the following reaction `A + CH_3ONa overset(Delta)to B overset"cold HI"to C_2H_5-OH + CH_3-I`. The compound A isA. `C_2H_5-OH`B. `C_2H_5-CHO`C. `C_2H_5-Br`D. `C_2H_5` |
| Answer» Correct Answer - C | |
| 882. |
When an alkyl halide is allowed to react with a sodium alkoxide the product most likely ?A. An aldehydeB. A ketoneC. An etherD. A carboxylic acid |
| Answer» Correct Answer - C | |
| 883. |
An alkyl halide `CH_3-oversetoverset(CH_3)|C Cl-C_2H_5` can be obtained by the action of HCl on which alcoholA. `(CH_3)_2CH-CH(OH)CH_3`B. `(CH_3)_2CH-CH_2-CH_2-OH`C. `CH_3-oversetoverset(CH_3)|COH-C_2H_5`D. all of these |
| Answer» Correct Answer - D | |
| 884. |
`+C_(2)H(5)I underset("Anhyde."C_(2)H_(5)OH)overset(.^(-)OC_(2)H_(5))(rarr)?`A. `C_(2)H_(5)-O-C_(2)H_(5)`B. `C_(6)H_(5)-O-C_(2)H_(5)`C. `C_(6)H_(5)-O-C_(6)H_(5)`D. `C_(6)H_(5)I` |
| Answer» Correct Answer - B | |
| 885. |
What are the products in the following reaction ? `C_(2)H_(5)OC_(2)H_(5)overset("Hl")underset("cold")rarr X+Y`A. `CH_(3)COOH,CH_(2)=CH_(2)`B. `CH_(3)CHO, CH_(2)=CH_(2)`C. `C_(2)H_(5)OH, C_(2)H_(5)l`D. None of the above |
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Answer» Correct Answer - C `C_(2)H_(5)OC_(2)H_(5)+HI rarr C_(2)H_(5)OH+C_(2)H_(5)I` |
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| 886. |
In the following reaction `C_(2)H_(5)OC_(2)H_(5)+4Hoverset(Red P+HI)(rarr)2X+H_(2)O` `X` isA. EthaneB. EthyleneC. ButaneD. Propane |
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Answer» Correct Answer - A `C_(2)H_(5)OC_(2)H_(5)overset(RedP//HI)underset("Cleavage of ethers")rarr 2C_(2)H_(5)I overset(RedP//HI)underset(Reduction)rarr underset("Ethane")(2C_(2)H_(6))` |
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| 887. |
The compound which liberates `H^2` gas with sodium metal is ,A. aldehydeB. ethanolC. etherD. ketone |
| Answer» Correct Answer - B | |
| 888. |
Ethanol reacts with diazomethane to produce `:`A. `CH_(3)-O-CH_(3)`B. `C_(2)H_(5)-O-CH_(3)`C. `C_(2)H_(65)-O-C_(2)H_(5)`D. none of these |
| Answer» Correct Answer - B | |
| 889. |
When `3,3-`dimethyl`-2-`butanol is heated with `H_(2)SO_(4)` the major product obtained isA. 2,3-dimethylbut-1-eneB. 3,3-dimethylbut-1-eneC. 2,3-dimethylbut-2-eneD. cis and trans isomers of 2,3-dimethylbut-2-ene |
| Answer» Correct Answer - C | |
| 890. |
1-butanol is reacted with diazomethane to give,A. 1-methoxy butaneB. 2-methoxy butaneC. 1-ethoxy butaneD. 2-ethoxy butane |
| Answer» Correct Answer - A | |
| 891. |
Correct statement (s) in cases of n-butanol and t-butanol is (are) `:`A. both are having equal solubility in waterB. t-butanol is more soluble in water than n-butanolC. boiling point of t-butanol is lower than n-butanolD. boiling point of n-butanol is lower than t-butanol |
| Answer» Correct Answer - B,C | |
| 892. |
For the reaction, Phenol `rarr` Cyclohexanol, the `s:p` ratio of the carbon attached to `-OH`group change from….to….A. `((1)/(3):(2)/(3))((1)/(4):(3)/(4))`B. `((1)/(3):(2)/(3))((1)/(2):(1)/(2))`C. `((1)/(2):(1)/(2))((1)/(3):(2)/(3))`D. None of these |
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Answer» Correct Answer - A Carbon changes its hybridisation state from `sp^(2)` to `sp^(3)`, i.e., `((1)/(3):(2)/(3))"to" ((1)/(4):(3)/(4))` |
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| 893. |
The reaction of glycerol with `HIO_(4)` givesA. formaldehydeB. formic acidC. iodic acidD. oxalic acid |
| Answer» Correct Answer - A,B,C | |
| 894. |
An industrial method of preparation of methanol isA. cathalytic reduciton of carbon monoxide in presence of `ZnO-Cr_(2)O_(3)`B. by reacting methane with steam at `900^(@)C` with a nickel cataystC. by reducing formaldehyde with lithium aluminium hydrideD. by reacting formaldehyde with aqueous sodium hydroxides solution |
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Answer» Correct Answer - A `ubrace(CO+H_(2))_("water gas")+H_(2)overset(Cr_(2)O_(3)-ZnO)underset(300^(@)C)rarrunderset(Methanol)(CH_(3)OH)` |
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| 895. |
Explain a process in which a biocatalyst is used industrial preparation of a compound known to you. |
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Answer» Enzymes are biocatalyst. These biocatalysts (enzymes) are used in the industrial preparation of ethanol. Ethanol is prepared by the fermentation of molasses -a dark brown coloured syrup left after crystallisation of sugar which still contains about 40% of sugar. The process of fermentation actually involves breaking down of large molecules into simple ones in the presence of enzymes. The source of these enzymes is yeast. The various reaction taking place during fermentation of carbohydrates are `underset("Sucrose")(C_(12)H_(22)O_(11))+H_(2)O overset("Invertase")rarr underset("Glucose")(C_(6)H_(12)O_(6))+underset("Fructose")(C_(6)H_(12)O_(6))` `underset("Glucose")(C_(6)H_(12)O_(6)) overset("Zymase")rarr underset("Ethyl alcohol")(2C_(2)H_(5)OH)+2CO_(2)` In wine making, grapes are the source and yeast. As grapes ripen, the quantity of sugar increases and yeast grows on the outer skin. When grapes are crushed, sugar and the enzyme come in contact and fermentation starts. Fermentation takes place in anaerobic conditions i.e., in absence of air. `CO_(2)` gas is released during fermentation. The action of zymase is inhibited once the percentage of alcohol formed exceeds 14 percent. If air gets into fermentation mixture, the oxygen of air oxidises ethanol to ethanoic acid which in turn destroys the taste of alcoholic drinks. |
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| 896. |
HBr reacts fastest withA. 2-methyl propan-2-olB. propan-1-olC. propan-2-olD. 2-methyl propan-1-ol |
| Answer» Correct Answer - A | |
| 897. |
What is formed when glycerol reacts with `HIO_(4)` ?A. Two molecules of formic acid and one molecule of formaldehydeB. Two molecules of formaldehyde and one molecule of formic acidC. Three molecules of formic acidD. Three molecules of formaldehyde |
| Answer» Correct Answer - B | |
| 898. |
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. `II gt III gt IV gt I`B. `II gt III gt I gt IV`C. `II gt II gt IV gt I`D. `III gt IV gt II gt I` |
| Answer» Correct Answer - C | |
| 899. |
Product of the following reaction will be A. B. C. D. |
| Answer» Correct Answer - B | |
| 900. |
An industrial method of the preparation of methanol is `:`A. by reacting `CH_(4)` with steam at 1173K with a nickel catalystB. by reduction of HCHO with `LiAlH_(4)`C. by catalytic reduction of CO in presence ZnO `-Cr_(2)O_(3)`D. by reaction of HCHO with `NaOH (aq.)` |
| Answer» Correct Answer - C | |