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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.
| 451. |
Ethylidene chloride is a/an…..A. vic-dihalideB. gem-dihalideC. allylic halideD. vinylic halide |
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Answer» Correct Answer - B In vic-dihalides, halogen atoms are present on the adjacent carbon atoms. In gem-dihalides, halogen atoms are present on the same carbon atom. They are known as alkylidene halides. In allylic halides, halogen atom is bonded to `sp^(3)` hybridised carbon atom next to carbon-carbon double bond In vinylic halides, halogen atom is bonded to `sp^(2)` hybridised carbon atom of a carbon-carbon double bond. In ethylidene chloride `(H_(3)C-CHCI_(2))` both halogen atoms are present on same carbon atom so it is gem-dihalide. |
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| 452. |
Cholorobenzene is formed by reaction of chlorine with benzene in the presence of `AlCl_(3)`. Which of the following species attacks the benzene ring in this reaction?A. `Cl^(-)`B. `Cl^(+)`C. `AlCl_(3)`D. `[AlCl_(4)]^(-)`. |
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Answer» Correct Answer - B It is the correct answer. `Cl^(+)` ion acts as electrophile. |
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| 453. |
Anhydrous `AlCl_(3)` is used in Firedel-Craft reaction because it isA. electron richB. electron deficientC. soluble in etherD. ionise to Al and Cl ions |
| Answer» Correct Answer - B | |
| 454. |
What is Wurtz reaction ? Give equation . |
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Answer» Wurtz Reaction : Alkyl halides react with sodium in dry ether solvent give alkanes . `R - X + 2 Na + underset("Alkyl halide")(X - R) overset("dry ether")(to) + underset("Alkone")(R - R) + 2 Na - X` |
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| 455. |
Which of the following is used in Friedel Craft acetylation reactionA. `(CH_(3)CO)_(2)O`B. `CH_(3)Cl`C. `C_(2)H_(5)-OH`D. `C_(2)H_(5)COOCH_(3)` |
| Answer» Correct Answer - A | |
| 456. |
The reaction, `C_(2)H_(5)+KOHoverset(aq.)toC_(2)H_(5)OH+KBr` is,A. a electrophilicB. a nucleophilicC. free radicalD. redox |
| Answer» Correct Answer - B | |
| 457. |
Friedel Craft acetylation of chlorobenezene givesA. 3-chloroacetophenoneB. 2-chloroacetophenoneC. 1-(4-chlorophyenyl) ethanoneD. 1-(3-chlorophenyl) ethanal |
| Answer» Correct Answer - C | |
| 458. |
Ethyl benzene is prepared from chlorobenzene and what ?A. `C_(2)H_(5)-Cl` in dry etherB. `C_(2)H_(5)-Cl` and Na in dry etherC. `C_(2)H_(5)-Cl` and Mg in dry etherD. `C_(2)H_(5)-Cl` and alc. KOH |
| Answer» Correct Answer - B | |
| 459. |
The major product of reaction with HBr is A. B. C. D. |
| Answer» Correct Answer - B | |
| 460. |
In finklestein reaction alkyl chloride is converted in toA. R-FB. R-IC. R-BrD. R-OH |
| Answer» Correct Answer - B | |
| 461. |
In Fitting reaction metal to used isA. NaB. CuC. KD. Mg |
| Answer» Correct Answer - A | |
| 462. |
The following reaction is `2C_(6)H_(5)-Cl+2Naoverset("dry ether")toC_(6)H_(5)+2NaCl`A. Fitting reactionB. Wurtz reactionC. Wurtz-Fitting reactionD. Ullmann reaction |
| Answer» Correct Answer - A | |
| 463. |
Swart reaction is used to prepareA. R-FB. R-ClC. R-BrD. R-I |
| Answer» Correct Answer - A | |
| 464. |
Wurtz-Fitting reaction is used to prepareA. alkyl benzeneB. higher alkaneC. diphenylD. phyenyl benzene |
| Answer» Correct Answer - A | |
| 465. |
Fitting reaction is used to prepareA. diphenylB. higher alkaneC. alkyl benzeneD. phenol |
| Answer» Correct Answer - A | |
| 466. |
Which of the following halogen-exchanged reaction is possible ?A. `R-I +NaCl to `B. `R-F+KCl to`C. `CH_(3)F+HBr to`D. `RCl+Nacl to` |
| Answer» Correct Answer - D | |
| 467. |
Frinkelestein reaction is used to prepareA. R-FB. R-ClC. R-BrD. R-I |
| Answer» Correct Answer - D | |
| 468. |
The order of decreasing reactivity towards nitration in the following compound is : A. `II gt IV gt III gt I`B. `II gt I gt III gt IV`C. `III gt II gt I gt IV `D. `I gt IV gt III gt II` |
| Answer» Correct Answer - D | |
| 469. |
`C_(4)H_(9)X` showsA. chain isomerismB. position isomerismC. optical isomerismD. all of these |
| Answer» Correct Answer - D | |
| 470. |
Consider the following `S_(N^2)`j reactions I. `RX+Y^(-)toR-Y+X^(-)` II. `RX+Y^(-)toR-Y^(+)+X^(-)` III. `RX^(+)+Y^(-)toR-Y+X` IV. `RX^(+)+YtoR-Y^(+)+X` In which reactions there is large increase and large decrease in rate of reaction respectively with increase in polarity of the solvent.A. II and IIIB. II and IVC. I and IVD. IV and I |
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Answer» Correct Answer - A For II. Transition state is more stabilised than reactant. For III : Reactants are more stabilised than transition state. Hence, rate of reaction is affected accordingly. |
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| 471. |
Explain why displacement of cyanide ion and amide ion by other nucleophiles is not observed in nucleophilic substitution reaction. |
| Answer» both cyanide ion `(CN^(-))` and amide ion `(NH_(2)^(-))` are themselves powerful powerful necleophiles and it is not easy to displace them by other nucleophiles in the nucleophilic substitution substitution reaction. | |
| 472. |
Why is chloroform not used as anaesthetic these days? What is the commonly used anaesthetic? |
| Answer» Chloroform is not used as anaesthetic because of its slow oxidation to poisonous gas phosgene. Halothane `(CF_(3)CHClBr)` is the commonly used anaesthetic these days. | |
| 473. |
In the following reaction The major product obtained is :A. B. C. D. |
| Answer» Correct Answer - C | |
| 474. |
Chronic chloroform exposure may cause damage to liver and kidney due to the formation of :A. phosgeneB. methylene chlorideC. methyl chlorideD. carbon tetrachloride |
| Answer» Correct Answer - A | |
| 475. |
The correct order of reactivity of the halides ethyl chloride (I) iso-propyl chloride (II) and benzyl chloride (III) in `S_(N^(1))` reaction is :A. `III gt II gt I`B. `I gt II gt III`C. `II gt I gt III`D. `I gt III gt II` |
| Answer» Correct Answer - A | |
| 476. |
Out of benzyl chloride and chlorobenzene, which will give a white precipitate with `AgNO_(3)` solution? |
| Answer» Correct Answer - Benzyl chloride. | |
| 477. |
Assertion: Ethyl chloride is more reactive than vinyl chloride towards nucleophilic substitution. Reason: Vinyl group is electron donating in nature.A. If both assertion and reason are correct and reason is correct explanation for assertionB. 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 both assertion and reason are incorrect. |
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Answer» Correct Answer - C Correct reacton. In vinly chloride `C_Cl` bond acquires a partial double bond character due to conjugation and its cleavage is difficult. |
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| 478. |
Identify X, Y and Z in the following reaction (i). `C_(6)H_(6)overset(Cl_(2)//Fe)toXunderset("Pyridine")overset(CuCN)toYoverset("Hydrolysis")to`Z (ii). `C_(6)H_(5)NH_(2)overset(NaNO_(2)//HCl)toXoverset(CuBr)toYunderset("623K/Pressure")overset(NaOH)to`Z. |
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Answer» (i). `C_(6)H_(5)Cl,C_(6)H_(5)CN,C_(6)H_(5)OH` (ii). `C_(6)H_(5)N_(2)Cl,C_(6)H_(5)Br,C_(6)H_(5)OH` |
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| 479. |
Consider the following haloakanes 1 `CH_(3)F 2 CH_(3)Cl 3 CH_(2)Br 4 CH_(3)I` The increasing order of reactivity in nucelophilic subsittution reaction isA. `1 lt 2 lt 4 lt 3`B. `1 lt 2 lt 3 lt 4`C. `1 lt 3 lt 2 lt 4`D. `4 lt 3 lt 2 lt 1` |
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Answer» Correct Answer - B The rate of nucleophilic substituion reaction depends upon the strenght of C-X bond. Strongerthe C-X bond. The lesser will be its reactivity. Strenght of C-X bond depends upon the atomic size of halogen atom, which increases in the order `Flt Cl lt Br lt I`. |
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| 480. |
Out of vinyl chloride and ethyl chloride which is more easily hydrolysed? |
| Answer» Correct Answer - Ethyl chloride. | |
| 481. |
Which of the following haloakane is hydrolysed b `SN^(1)` mechansims ?A. `CH_(3)Br`B. `CH_(3)CH_(2)CH_(2)Br`C. `C_(2)H_(5)Br`D. `(CH_(3))_(3)CBr` |
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Answer» Correct Answer - D Thus, `SN^(1)` reactivity of haloakanes occurs in the order `CH_(3)lt 1^(@) lt 2^(@) lt 3^(2)`. The determining factor is stability of carbocation. |
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| 482. |
Which reagent cannot be used to prepare haloakane from an alcohol ?A. HClB. HBrC. HID. `Br_(2)` |
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Answer» Correct Answer - D With `HX(X=Cl,Br,I)` the reaction occurs via protonation. The protonated alcohol then react with `X^(-)` to from haloalkane. An alcohol does not react with `Br_(2)` because there is a no protonating agne and secondly, the extermely weak base `Br^(-)` cannot displace very strong base `OH^(-)` |
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| 483. |
Which does not give alkyl bromide ?A. `CH_(3)OH+ HBr`B. `CH_(3)OH+PBr_(3)`C. `CH_(3)=CH_(2)+HBr`D. `CH_(3)COOH+PBr_(3)` |
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Answer» Correct Answer - D Compounds a,b,c gives alkyl bromide but compound d give acetyl bromide. |
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| 484. |
Which one of the following compounds will give in the presence of peroxide a product different from that obtainded in the absence peroxide ?A. 1-butene, HClB. 2-butene, HClC. 1-butene, HBrD. 2-butene, HBr |
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Answer» Correct Answer - C Peroxide effect is observed asymmetric alkene with Hbr only (not with HCl or HI and symmetricla alkenes) `CH_(3)CH_(2)CH=HBr overset(R_(2) O_(2)) to CH_(3)CH_(2)CH_(2)CH_(2)Br` `CH_(3)CH_(2)CH=HBr overset(M.R) to CH_(3)CH_(2)CHBrCH_(3)` |
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| 485. |
Which one of the following compounds will give in the presence of peroxide a product different from that obtainded in the absence peroxide ?A. 1-butene HCIB. 1-butene HBrC. 2-butene HCID. 2-butene HBr |
| Answer» Correct Answer - 2 | |
| 486. |
The product obtained by reduction of benzyl bromide with `LIAIH_(4)` isA. B. C. D. |
| Answer» Correct Answer - 3 | |
| 487. |
Reagent used in Finkestein reaction isA. NaI in dry acetoneB. HI in dry acetoneC. NaOI in dry acetoneD. NaI in dry ether |
| Answer» Correct Answer - A | |
| 488. |
Beznyl iodide is obtained from benzyl brimide by singA. HI in etherB. HI in dry acetoneC. NaI in etherD. NaI in dry ether |
| Answer» Correct Answer - D | |
| 489. |
Cyclopentyl bromide is reacted with NaI in dry acetone givesA. cylopentyl sodium iodideB. cylopentaneC. cyclopentaneD. cyclopentyl iodide |
| Answer» Correct Answer - C | |
| 490. |
Which among the following compounds wil be most reactive for `S_(N^(1))` reaction ?A. B. C. D. |
| Answer» Correct Answer - 4 | |
| 491. |
Fluorobenzene `(C_(6)H_(5)F)` can be synthesized in the laboratory ,A. by heating phenol with HF and KFB. from aniline by diazotisation followed by heating the diazonium salt with `HBF_(4)`C. by direct fluorination of benzene with `F_(2)` gasD. by reacting bromobenzene with NaF solution |
| Answer» Correct Answer - B | |
| 492. |
`CH_(3)-underset(Br) underset(|) (CH)-CH_(2)-CH_(3)` is obtained by bromination of n-butane. The catyls isA. U.V. lightB. `AlBr_(3)`C. `LiAlH_(4)`D. `Sn+` conc HCl |
| Answer» Correct Answer - B | |
| 493. |
The reaction `CH_(2)=CH-CH_(3)+HBr rarr CH_(3)-overset(Br)overset(|)(C )HCH_(3)` isA. nucleophilic additionB. free radical additionC. electrophilic additionD. electrophilic substitution |
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Answer» Correct Answer - C Alkenes undergo electronphilic addition with hydrogen halide. |
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| 494. |
The major product formed in the following reation is `CH_(3)-underset(H)underset(|)overset(CH_(3))overset(|)C-CH_(2)-Br underset(CH_(3)OH)overset(CH_(3)ONa)rarr` .A. `CH_(3)-overset(CH_(3))overset(|)underset(H)underset(|)C-CH_(2)OCH_(2)`B. `CH_(3)-underset(OCH_(3))underset(|)(CH)-CH_(2)CH_(3)`C. `CH_(3)-overset(CH_(3))overset(|)C=CH_(2)`D. `CH_(3)-overset(CH_(3))overset(|)underset(OCH_(3))underset(|)C-CH_(3)` |
| Answer» Correct Answer - D | |
| 495. |
Which is the major product when propane is reacted with `Br_(2)` in the presence of light |
| Answer» Correct Answer - 2-Bromopropane | |
| 496. |
An alkyl bromide reacts with `Na` metal to form `4,5`-diethyl octane. The bromide isA. `CH_(3)(CH_(2))_(5)Br`B. `CH_(3)(CH_(2))_(3) CH(Br)CH_(3)`C. `CH_(3)(CH_(2))_(3) Br`D. `CH_(3)(CH_(2))_(2) CH(Br)CH_(2)CH_(3)` |
| Answer» Correct Answer - D | |
| 497. |
Ethl aclochol is obtained when ethyl chloride is boiled with :A. alcoholic KOHB. aqueous KOHC. waterD. `H_(2)O_(2)` |
| Answer» Correct Answer - B | |
| 498. |
Which one of the following statements is wrong ?A. Lower alkyl halides are either colourless gases or volatile liquidsB. Alkyl halides are very soluble in waterC. Alkyl halides burn easily with green edged flameD. the higher alkyl halides are colouress solids |
| Answer» Correct Answer - B | |
| 499. |
The intermediate during the addition of `HCl` to propene in the presence of peroxide is :A. `CH_(3)- overset(*)(CH)-CH_(2)-Cl`B. `CH_(3)-CH_(2)-overset(*)(CH_(2))`C. `CH_(3)-overset(+)(CH)-CH_(3)`D. `CH_(3)-CH_(2)-CH_(2)^(+)` |
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Answer» Correct Answer - C Peroxide effect is observed only with HBr not for nay other adding agent. |
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| 500. |
Chlorobenzene can be converted into phenol by heating in aqueous sodium hydroxide solution at temperature of 623K and a pressure of 300atm. However the rate of reaction can be increased by presence of certain groups in benzene ring. What will be the order of reactivity of following compounds towards the above substitution reaction? A. (iii)gt(ii)gt(i)B. (ii)gt(iii)gt(i)C. (i)gt(ii)gt(iii)D. (i0gt(iii)gt(ii) |
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Answer» Correct Answer - A The presence of an electron withdrawing group `(-NO_2)` at ortho and para -positions increases the reactivity fo haloarenes. |
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