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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.
| 1. |
The type of isomerism observed in urea and `NH_(2)-CH=NOH`A. ChainB. PositionC. GeometricalD. Tautomerism |
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Answer» Correct Answer - D `H_(2)N-overset(O)overset(||)(C )-NH_(2)underset(("Tautomerism"))(hArr)HN=overset(OH)overset(|)(C )-NH_(2)` |
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| 2. |
An organic compound with formula `C_(4)H_(6)(X)` gives precipitate of X and reacts with 1 mole of `Br_(2)` to form 1, 4-dibromo-2-butene. X and Y areA. `CH_(3)CH_(2)-C-=CH` and `CH_(2)=CH-CH=CH_(2)`B. `CH_(3)-=C CH_(3)` and `CH_(3)CH_(2)C-=CH`C. `CH_(3)C-=C CH_(3)` and `CH_(3)CH=C=CH_(2)`D. |
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Answer» Correct Answer - A X will be terminal alkyne and Y can either be non-terminal alkyne or its functional isomers, i.e., diene. |
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| 3. |
When ethyl alcohol and `KI` reacted in presence of `Na_(a)CO_(3)` yellow crystals of …are formed ? .A. `CHI_(3)`B. `CI_(4)`C. `CH_(2)I_(2)`D. `C_(2)H_(5)I` |
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Answer» Correct Answer - A `C_(2)H_(5)OHunderset(Na_(2)CO_(3))overset(KI)rarrCHI_(3)` |
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| 4. |
The replacement of chlorine of chlorobenzene to give phenol requires drastic conditions, but the chlorine of 2,4-dinitrochlorobenzene is readily replaced sinceA. nitro groups make the aromatic ring electron rich at ortho/prar position.B. nitro groups withdraw electrons from meta position of the aromatic ring.C. nitro groups donate electrons at meta position.D. nitro groups withdraw electrons from ortho/para position at the aromatic ring. |
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Answer» Correct Answer - D The subsitution of -Cl in chlorobenzene with -OH is an example of nucleophilic substitution. More the deactivation, more is the ease of nucleophilic attack. `-NO_(2)` group deactivates, o- and p-positions more than m-position. |
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| 5. |
When ethyl alcohol and `KI` reacted in presence of `Na_(a)CO_(3)` yellow crystals of …are formed ? .A. `CHI_(3)`B. `CH_(3)I`C. `CH_(2)I_(2)`D. `C_(2)H_(5)I` |
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Answer» Correct Answer - A `C_(2)H_(5)OHunderset(Na_(2)Co_(3))overset(KI)rarrCH_(3)` |
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| 6. |
Assertion: `C_(6)H_(5)CI` on treating with `NaOH` does not show replacement of `CI` atom by `OH` Reason: The resonance in chlorobenzene stabilizen the molecule .A. If both assertion and reason are true and the reasone is the correct explanation of the assertion .B. If both assertion and reason are true but reason is the correct explanation of the assertion .C. If assertion is true but reasone is falseD. If assertion is false but reason is true . |
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Answer» Correct Answer - A If both assertion and reason are true and the reason is the correct explanation of the assertion . |
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| 7. |
Assertion The p - isomer of dichlorobenzene has higher m.p than o-and m isomer Reason p-isomer is symmetrical and thus shows more closely packed structure .A. If both assertion and reason are true and the reasone is the correct explanation of the assertion .B. If both assertion and reason are true but reason is the correct explanation of the assertion .C. If assertion is true but reasone is falseD. If assertion is false but reason is true . |
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Answer» Correct Answer - A If both assertion and reason are true and the reason is the correct explanation of the assertion . |
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| 8. |
When ethyl chloride is heated with AgCN, the main product is :A. `C_(2)H_(5)NC`B. `C_(2)H_(5)NH_(2)`C. `C_(2)H_(5)CN`D. None of these |
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Answer» Correct Answer - C `CH_(3)CH_(2)Cl+AgCN rarr CH_(3)CH_(2)NC+AgCl`. The functional isomer of isocyanides are cyanides i.e., `C_(2)H_(5)CN` |
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| 9. |
Ethyl alcohol gives ethyl chloride with the help ofA. `SOCl_(2)`B. NaClC. `Cl_(2)`D. KCl |
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Answer» Correct Answer - A `ROH + underset("chloride")underset("Thionyl")(SOCl_(2))overset("Pyridine")rarr RCl+SO_(2)uarr+HCl uarr` |
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| 10. |
Wurtz reaction of methyl iodide yields an organic compound `X` Which one of the following reactions also yields `X` .A. `C_(2)H_(5)CI +Mg overset("dryether")rarr`B. `C_(2)H_(5)Cl+LiAlH_(4)to`C. `C_(2)H_(5)CI+C_(2)H_(5)ONa rarr`D. `CHCI_(3)underset(Delta)overset("Ag powder")rarr` |
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Answer» Correct Answer - B Wurtz reaction gives ethane `2CH_(3)I+2Na underset(ether)overset(dry)rarrC_(2)H_(6)+2NaI` Similarly `C_(2)H_(6)CI` reduced by `LiAIH_(4)` give ethane `C_(2)H_(5)CI+2H overset(LiAHI_(4))rarrC_(2)H_(6)+HCI` . |
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| 11. |
Assertion:of tert butylchloride with Na gives `2,2,3,3`-tetramethy butane Reason Tert butyl chloride on Wurtz reaction gives alkene.A. If both assertion and reason are true and the reasone is the correct explanation of the assertion .B. If both assertion and reason are true but reason is the correct explanation of the assertion .C. If assertion is true but reasone is falseD. If assertion is false but reason is true . |
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Answer» Correct Answer - D `(CH_(3))_(3)CBroverset(Na)rarr(CH_(3))_(2)C=CH_(2)` . |
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| 12. |
The reactivity of ethyl chloride isA. More or less equal to that of benzyl chlorideB. More than that of benzyl chlorideC. More or less equal to that of chlorobenzeneD. Less than that of chlorobenzene |
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Answer» Correct Answer - B `underset("more reactive" )(C_(2)H_(5)-C1)underset("less reactive")(gtC_(6)H_(5)-CH_(2)-C1)` |
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| 13. |
Wurtz reaction of methyl iodide yields an organic compound `X` Which one of the following reactions also yields `X` .A. `C_(2)H_(5)Cl+LiAlH_(4) rarr`B. `C_(2)H_(5)Cl+Mg overset("dry ether")rarr`C. `C_(2)H_(5)Cl+C_(2)H_(5)Ona rarr`D. `CHCl_(3)+Ag("Powder")overset(Delta)rarr` |
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Answer» Correct Answer - A (A) `2CH_(3)I+2Nararr underset("Ethane(X)")(CH_(3)-CH_(3))+2NaI` `C_(2)H_(5)Cl overset((i)LiAlH_(4))underset((ii) H_(2)O)rarr underset("Ethane(X)")(C_(2)H_(6))+HCl` |
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| 14. |
Chloroform on reaction with acetone yields ,A. insecticideB. analgesicC. isocyanideD. hypnotic |
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Answer» Correct Answer - D Chloretone which is a hynotic in medicine. |
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| 15. |
Treatment of ammonia with excess of ethyl chloride will yieldA. Diethyl amineB. ethaneC. Tetraethyl ammonium chlorideD. methyl amine |
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Answer» Correct Answer - C `C_(2)H_(5)Cioverset(NH_(3))rarr C_(2)H_(5)-NH_(2)` `overset(C_(2)H_(5)CI)rarr(C_(2)H_(5))_(2)-NH` `overset(C_(2)H_(5)CI)rarr(C_(2)H_(5))_(3)N` `overset(C_(2)H_(5)CI)rarr [underset("Tetraethylammonium chloride")[C_(2)H_(5)-underset(C_(2)H_(5))underset(|)overset(C_(2)H_(5))overset(|)N-C_(2)H_(5)]CIbar]` If `NH_(3)` is in excess then `1^(@)` amine will be the main product if `C_(2)H_(5)CI` is in excess then mixture of `1^(@)` ,`2^(@)` ,`3^(@)` and quaternary amine is obtained . |
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| 16. |
When 32.25 g of ethyl chloride is subjected to dehydrohalogenation reaction, the yield of alkene formed is 50%. The mass of the product formed is (atomic mass of Cl = 35.5)A. 14 gB. 28 gC. `66.5 g`D. 7 g |
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Answer» Correct Answer - D `underset(64.5g)(CH_(3)CH_(2)Cl)overset(KOH(alc.)Delta)underset(-KCl, -H_(2)O)rarrunderset(28 g)(CH_(2)=CH_(2))` yield of `CH_(2)=CH_(2)=(28)/(64.5)xx(32.25xx56)/(100)=7 g` |
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| 17. |
Given the following sequence of reactions `CH_(3)CH_(2)I overset(KCN)rarr A overset(OH^(-))underset("Partial hydrolysis")rarr B overset(Br_(2))underset(NaOH)rarr C` The major product (C ) isA. `CH_(3)CH_(2)NH_(2)`B. `CH_(3)CH_(2)underset(O)underset("||")(C )-NHBr`C. `CH_(3)CH_(2)COONH_(4)`D. `CH_(3)CH_(2)-underset(O)underset("||")(C )NBr_(2)` |
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Answer» Correct Answer - A `CH_(3)CH_(2)I overset(NaCN)rarr CH_(3)CH_(2)CN overset("Partial")underset("hydrolyses")rarr CH_(3)CH_(2)CONH_(2)overset(Br_(2))underset(NaOH)rarr CH_(3)CH_(2)NH_(2)` |
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| 18. |
Ethylene dibromide is heated with metallic zinc in the presence of alcohol. The gas so produced in the presence of alcohol. The gas so produced is allowed to react with hydrogen bromide. The product is :A. Ethylene dibromideB. Ethyl bromideC. Ethyledene bromideD. None of above |
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Answer» Correct Answer - B `underset("Ethylene dibromide"){:(CH_(2)-Br),(|),(CH_(2)-Br):} overset(Zn//alc)underset(-ZnBr_(2))rarr {:(H_(2)C),(" ||"),(H_(2)C):} overset(HBr)rarr {:(CH_(3)),(|),(CH_(2)Br):}` |
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| 19. |
Which of the following undergoes nucleophilic substitution exclusively by `S_(N^(1))` mechanism?A. Benzyl chlorideB. Ethyl chlorideC. ChlorobenzeneD. Isopropyl chloride |
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Answer» Correct Answer - A Benzyl chloride forms resonance stabilised benzyl carbocation for `S_(N^(1))` reaction. |
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| 20. |
Which of the following halids would undergo nucleophilic substituion most readily ?A. 1-Chloro-1-buteneB. 2-Chloro-1-buteneC. 3-Chloro-1-buteneD. 4-Chloro-1-butene |
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Answer» Correct Answer - A 3-Chloro-1-butene is an allylic halide. |
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| 21. |
Allyl chloride on dehydrochlorination givesA. propadieneB. propyleneC. acetyl chlorideD. acetone |
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Answer» Correct Answer - A `underset("Allyl chloride")(CH_(2)=CH-CH_(2)Cl)overset("Dehydrohalogenation")underset(Alc. KOH)rarr underset("Propadiene")(CH_(2)=C)=CH_(2)+KCl+H_(2)O` |
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| 22. |
The halogen compound which most readily undergoes nucleophilic substitution isA. `CH_(2)=CHCl`B. `CH_(3)CH=CHCl`C. `CH_(2)=C(Cl)=CH_(2)`D. `CH_(2)=CHCH_(2)Cl` |
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Answer» Correct Answer - D In `CH_(2)=CHCH_(2)Cl` is attached to `sp^(3)` carbon while in all other compounds, Cl is attached to `sp^(2)` carbon. In other words, allyl chlorides are more reactive than vinyl and aryl chlorides. |
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| 23. |
In which case formation of butane nitrile is possible ?A. `C_(3)H_(7)Br+KCN`B. `C_(4)H_(9)Br+KCN`C. `C_(3)H_(7)OH+KCN`D. `C_(4)H_(9)OH+KCN` |
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Answer» Correct Answer - A `CH_(3)CH_(2)CH_(2)Br+KCN rarr underset("Butanenitrile")(CH_(3)CH_(2)CH_(2)CN)+KBr` |
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| 24. |
Only two isomeric monochloro derivatives are possible forA. n-ButaneB. 2,4-DimethylpentaneC. BenzeneD. 2-Methylpropane |
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Answer» Correct Answer - A::D `underset("Monochloroderivatives of n-butane")(CH_(3)-CH_(2)-overset(Cl)overset(|)(C )H-CH_(3) " " CH_(3)-CH_(2)-CH_(2)-CH_(2)Cl)` `underset("Monochloroderivatives of 2-methylpropane")(CH_(3)-overset(CH_(3))overset("| ")underset(Cl)underset("| ")("C ")-CH_(3) " " CH_(3)-overset(CH_(3))overset("| ")("C ")H-CH_(2)-Cl)` |
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| 25. |
Dehydrahalogenation is possible inA. `(C_(6)H_(5))_(3)C-Cl`B. `(CH_(3))_(3)C.Cl`C. `CH_(3)Br`D. Both A nad B |
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Answer» Correct Answer - B Due to the presence of `beta`-hydrogen. |
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| 26. |
Ethanol `overset(P_(4)//I_(2))rarr X overset((i)KOH(alc))underset((ii) HBr)rarr Y` In this sequence of reactions Y is :A. EtheneB. BromoethaneC. EthanolD. None |
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Answer» Correct Answer - B `C_(2)H_(5)OH overset(P_(4)//I_(2))rarr underset((X))(C_(2)H_(5)I) overset((i)KOH)underset((alc))rarr H_(2)C=CH_(2)overset((ii)HBr)rarr underset("Bromoethane")(H_(3)C-CH_(2)-Br)` |
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| 27. |
`C_(2)H_(5)I overset(KOH(alc))rarr A overset(Cl_(2)(g))underset(770K)rarr X`, X can beA. vinyl chlorideB. allyl chlorideC. ethyl chlorideD. ethyl iodine chloride |
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Answer» Correct Answer - A `C_(2)H_(5)I overset(KOH(alc)rarr H_(2)C=CH_(2) overset(Cl_(2)(g))underset(770 K, HCl)rarr underset("Vinyl chloride")(H_(2)C=CH-Cl)` |
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| 28. |
`CH_(3)CH_(2)CH_(2)Br overset(alc. KOH)rarr CH_(3)CH=CH_(2)+HBr` is an exmple of theA. Substitution reactionB. Addition reactionC. Elimination reactionD. electrophilic addition reaction |
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Answer» Correct Answer - C Reaction between propene and HCl to yield isopropyl chloride is an example of electrophilic addition reaction. `CH_(3)CH=CH_(2)+HCl rarr CH_(3)underset(Cl)underset(|)(C )H-CH_(3)` |
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| 29. |
`R overset(Alc. KOH)rarr CH_(3)-CH=C=CH_(2)` R in the above reaction isA. `CH_(3)CH=C=CH_(2)`B. `H_(2)C=C=C=CH_(2)`C. `H_(3)C-C-=C-CH_(3)`D. `H_(3)C-CH_(2)-C-=CH` |
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Answer» Correct Answer - D `underset(("Alkyne"))(H_(3)C-CH_(2)-C-=CH)overset(Alc. KOH)rarr H_(3)C-CH=CH=C=CH_(2)` |
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| 30. |
In order to prepare ethyl carbylamine from ethyl iodine, the reagent required isA. ethanolic solution of AgCNB. ethanolic solution of `NH_(3)`C. ethanolic solution of KCND. ethanolic solution of `RNH_(2)` |
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Answer» Correct Answer - A `C_(2)H_(5)I+AgCN overset(-Agl)rarr underset("Carbylaminoethane")(C_(2)H_(5)-N-=C)` |
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| 31. |
Which halide of formula `C_(4)H_(9)I` is capable of producing but -2-ene with alcoholic KOH solution ?A. 1-IodobutaneB. 2-IodobutaneC. 1-Iodo-2-methylpropaneD. 2-Iodo-2-methylpropane |
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Answer» Correct Answer - B `underset("2-Iodobutane")(H_(3)C-underset("I ")underset(|)(C )H)-CH_(2)-CH_(3)overset(alc. KOH)underset(-KI,-H_(2)O)rarr underset("But-2-ene")(H_(3)C-CH=CH)-CH_(3)` (Ssytzeff rule) |
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| 32. |
In order to prepare fluorobenzene from benzene diazonium chloride which of the following reagent is usedA. FluorineB. HFC. Hydrofluorosilicic acidD. Fluoboric acid |
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Answer» Correct Answer - D `C_(6)H_(5)N_(2)+Cl^(-)overset(HBF_(4))underset(-HCl)rarr C_(6)H_(5)N_(2)^(+)BF_(4)^(-)overset(Delta)underset(-N_(2),-BF_(3))rarr underset("Fluorobenzene")(C_(6)H_(5)F)` |
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| 33. |
When sodium salt of ethanol is treated with ethyl bromide, the product formed is :A. MethoxyethaneB. EthoxyethanolC. Methyl ethyl ketoneD. Diethylether |
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Answer» Correct Answer - D `underset("Soda. salt of Ethanol")(C_(2)H_(5)Ona)+underset("Ethyl bromide")(Br-C_(2)H_(5))overset(-NaBr)rarr underset("Diethyl ether")(C_(2)H_(5)-O-C_(2)H_(5))` |
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| 34. |
Grignard reagent is not prepared in aqueous medium but prepared in ether medium, becauseA. the reagent is highly reactive in etherB. the reagent does not react with waterC. the reagent becomes inactive in waterD. the reagent reacts with water |
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Answer» Correct Answer - D The reagent reacts with `H_(2)O`. `RMgX+H_(2)O rarr RH+Mg(OH)_(2)` |
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| 35. |
Which of the following does not form Grignard reagent on reaction with Mg in the presence of ether ?A. ChloroethaneB. 1-ChloropropaneC. BromobenzeneD. Chlorobenzene |
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Answer» Correct Answer - D Chlorobenzene forms Grignard reagent in the presence of THF (tetrahydrofuran) as solvent. |
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| 36. |
Which of the following reagent is used as a refregerant ?A. `C Cl_(4)`B. `CH_(2)Cl_(2)`C. `CF_(2)Cl_(2)`D. `CF_(4)` |
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Answer» Correct Answer - C Freon, `CF_(2)Cl_(2)` is used as refrigerant. |
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| 37. |
X on treatment with sodium hydroxide followed by the addition of silver nitrate give white precipitate at room temperature which are soluble in `NH_(4)OH`. X can be :A. ChlorobenzeneB. Ethyl bromideC. Benzyl chlorideD. Vinyl chloride |
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Answer» Correct Answer - C `C_(6)H_(5)CH_(2)Cl+NaOH(aq)rarr NaCl+C_(6)H_(5)CH_(2)OH` `NaCl+AgNO_(3)rarr underset(("White ppt."))(AgCl darr)+NaNO_(3)` |
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| 38. |
In order to get ethanetiol from bromoethane, the reagent used is :A. sodium bisulphideB. sodium sulphideC. potassium thiocyanateD. potassium sulphide |
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Answer» Correct Answer - A `underset("Bromoethane")(CH_(3)-CH_(2)-Br)+ underset("Sod. bisulphide")(NaSH)rarr NaBr+ underset("Ethanethiol")(H_(3)C-CH_(2)SH)` |
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| 39. |
What is the chief product obtained when `n-`butane is treated with `Br_(2)` in the presence of light at `130^(@)C`?A. `CH_(3)CH_(2)CH_(2)CH_(2)Br`B. `Ch_(3) CH_(2)CHBrunderset(CH_3)underset(|)CHBr`C. `Ch_(3) -CH_(2) HBrunderset(CH_2Br)underset(|)CHBr`D. `Ch_(3) -CH_(2) HBrunderset(CH_3)underset(|)CBr_(2)` |
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Answer» Correct Answer - B The reaction proceeds via free radical mechanism and rate of abstraction of `2^(@)` hydrogen is faster As `2^(@)` free radical is more stable tnan `1^(@)` , so `CH_(3) CH_(2) CH(Br)CH_(3) ` would be formed . |
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| 40. |
The reaction conditions leading to the best yield of `C_(2)H_(5)Cl` areA. `C_(2)H_(6)(excess)+CI_(2) overset(UVlight)rarr`B. `C_(2)H_(6)(excess)+CI_(2) underset( "om temperature")overset(dark)rarr`C. `C_(2)H_(6)(excess)+CI_(2)(excess) overset("UV light")rarr`D. `C_(2)H_(6)+CI_(2)overset("UV light")rarr` |
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Answer» Correct Answer - A Chlorination beyond monochlorination during the preparation of alkyl halides in presence of `UV` light can be suppressed by taking alkane in excess As it will happen in cae of (C ) and (d) In (b) free readical substitution can t take place in dark |
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| 41. |
The reaction conditions leading to the best yield of `C_(2)H_(5)Cl` are :A. `C_(2)H_(6)("excess")+Cl_(2)overset("UV light")rarr`B. `C_(2)H_(6)+Cl_(2)overset("Dark")underset("room temperature")rarr`C. `C_(2)H_(6)+Cl_(2)("excess")overset("UV light")rarr`D. `C_(2)H_(6)+Cl_(2)overset("UV light")rarr` |
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Answer» Correct Answer - A Best yield of `C_(2)H_(5)Cl` is obtained when `C_(2)H_(6)` is in excess and in the presence of U.V. light. |
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| 42. |
`(A)overset(CI_(2)//h2)rarr (B) overset(aq.KOH)rarr(C)overset([O])rarr CH_(3) CHO` Identify `A,B and C` .A. Ethyl alcohol, Ethyl chloride and EthaneB. Ethane Ethyl chloride and Ethyl alcoholC. Propane Propyl chloride and Propyl alcoholD. All of the above |
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Answer» Correct Answer - B `C_(2) H_(6) underset[[A]]overset(C1_(2)//hv)rarrC_(2)H_(5)CI underset[[B]]overset(aqKOH)rarrC_(2)H_(5)OH underset([C])overset([O])rarrCH_(3)CHO` |
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| 43. |
the major product in the following reaction is : `CH_(3)CH(Cl)CH_(2)CH_(2)OH overset(KOH (aq))(rarr)`A. `CH_(3)CH=CHCH_(2)OH`B. `CH_(2)=CH-CH_(2)CH_(2)OH`C. D. `CH_(3)-underset(OH)underset(|)(C )H-CH_(2)CH_(2)OH` |
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Answer» Correct Answer - D Intra molecular displacement of Cl by OH does not occur because four membered rings are not easily formed. Therefore with aq KOH only hydrolysis occurs. Thus (D) is correct |
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| 44. |
Mistake in the name but-1-ene ol isA. numbering from the wrong endB. wrong parent alkaneC. incorrect endingD. no mistake |
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Answer» Correct Answer - A The compound sums to have -OH group and double bond at its terminals and numbering should be done in such a manner that the -OH group (principal group) untill get theleast possible number while the name suggest that it has been assigned the maximum possible number. |
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| 45. |
`HBr` reacts with `CH_(2)=CH-OCH_(3)` under anhydrous conditions at room temperature to give:A. `CH_(3)CHO` and `CH_(3)Br`B. `BrCH_(2)CHO` and `CH_(3)OH`C. `BrCH_(2)CH_(2)OCH_(3)`D. `CH_(3)-CHBr-OCH_(3)` |
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Answer» Correct Answer - D Addition of a proton to the terminal `CH_(2)` gives a carbocation which is stabilized by + R effect of `OCH_(3)` group. |
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| 46. |
Among the following the most reactive alcoholic `KOH` is .A. `CH_(3)-CI`B. `CH_(3)-CH_(2)-CI`C. `CH_(3)CH_(2)Br`D. `CH_(3)CH_(2)CH_(2)Br` |
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Answer» Correct Answer - D The polarity between `C-X` bond increases by increasing the + I effect which increase by increasing the alkyl group by which `X` of `C-X` easily eliminate In `CH_(3)CH_(2)CH_(2)Br` the polarity decreases due to the presence of double bond presence of `CO` group (-I) and less no of alkyl group . `CH_(3)CH_(2)CH_(2)Br + KOH overset(alc)rarr` `CH_(3)CH=CH_(2)+KBr + H_(2)O` . |
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| 47. |
An organic compound `A(C_(4)H_(6)CI)` on reation withNa/diethyl ether gives a hydrocarbon which on monochlorination gives only one chloro derivative `A` is .A. t-butyl chlorideB. s-butyl chlorideC. Isobutyl chlorideD. n-butyl chloride |
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Answer» Correct Answer - A `{:underset(CH_(3)-overset(CH_(2)Cl)overset(|)underset(Cl)underset(|)C-CH_(3)-CH_(3))(underset(darr+Cl_(2))(2CH_(3)-overset(CH_(3))overset(|)underset(Cl)underset(|)C-CH_(3)))overset(ether)underset(2Na)tounderset(underset("butyl alcohol")underset(-CH_(2) " Cl derivative so it is tertiarry")("all "-CH_(3) " gives same monochloro"))(underset(darr+Cl_(2))(CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-overset(CH_(3))overset(|)underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-CH_(3)+2NaCl:}` . |
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| 48. |
Isobutyl magneisum bromide with dry ether and absolute alcohol givesA. `CH_(3)-underset(CH_(3))underset(|)CH-CH_(2)OHand CH_(3)CH_(2)MgBr`B. `CH_(3)-underset(CH_(3))underset(|)CH-CH_(3)OHand Mg Br (OC_(2)H_(5))`C. `CH_(3)-underset(CH_(3))underset(|)CH-CH_(3)OHand Mg (OH)Br`D. `CH_(3)-underset(CH_(3))underset(|)CH-CH_(3)and CH_(3) CH_(2) OMg Br` |
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Answer» Correct Answer - B `(CH_(3))_(2)CHCH_(2)MgBroverset(C_(2)H_(5)OH)to(CH_(3))_(2)CHCH_(3)+C_(2)H_(5)O` MgBr as `R` of Grignard s reagent will take proton and from alkene . |
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| 49. |
Toluene when treated with `Br_(2)//Fe`, gives p-bromotoluene as the major product because the methyl groupA. is para directingB. is m-directingC. activates the ring by hyperconjugationD. deactivates the ring |
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Answer» Correct Answer - A::C Methyl group is p-directing as it activates the ring by hyperconjugation. |
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| 50. |
Butanenitrile may be prepared by heatingA. Propyl alcohol with KCNB. Butyl alcohol with KCNC. Propyl chloride with KCND. Propyl chloride with KCN |
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Answer» Correct Answer - D `underset("Propyl chloride")(CH_(3)CH_(2)CH_(2)Cl)+KCN rarr underset("Butanenitrile")(CH_(3)CH_(2)CH_(2)CN)+KCl` |
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