InterviewSolution
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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. |
A solution of (+)2-chloro-2-phenylethane in toluene racemises slowly in the presence of small amount of `SbCI_(5)` due to the formation of-A. carbanionB. carbeneC. free-radicalD. carbocation |
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Answer» Correct Answer - D |
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| 2. |
With alcoholic potash, `C_4H_8Cl_2` (A) gives `C_4H_6` (B), which reacts with ammoniacal cuprous chloride. Identify the compounds (A) and (B).A. 1-buteneB. 1-butanolC. 2-buteneD. 2-butanol |
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Answer» Correct Answer - A |
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| 3. |
The reaction conditions leading to the best yield of `C_(2)H_(5)Cl` areA. `C_(2)H_(6)("excess")+ cl_(2) overset("UV light")rarr`B. `C_(2)H_(6)+ cl_(2)("excess")underset("room temp." )overset("dark ")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 |
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| 4. |
n-Propyl bromide on treatment with ethanolic potassium hydroxide produes .A. propaneB. propeneC. propyneD. propanol |
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Answer» Correct Answer - B |
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| 5. |
Relative rate of reaction with `H_(2)O` A. `(I)gt(II)gt(III)`B. `(II)gt(I)gt(III)`C. `(III)gt(II)gt(I)`D. `(III)gt(I)gt(II)` |
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Answer» Correct Answer - c Consider NGP more nucleophilic alkane will have will rate of raction . |
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| 6. |
product in above reaction is:A. B. C. D. |
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Answer» Correct Answer - a Dehydration followed by Hoffmann ehaustive methlaaton |
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| 7. |
Consider the potential energy diaram given below (X) Name the positions A-D (Y) Answer the following questions . (I) Both reaction pathways are. (II) which step is the rate determine step? `(III) which product is most stable ? (iv) In accordance with Hammonds potulate , exothermixc reaction tend to haveA. Early transition states that are reasctant -likeB. Late trastion staes that are reactant -likeC. Earlty trnstion states thaat are product -likeD. Late transition states that are product-like |
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Answer» Correct Answer - (X) A-reactiants ,B -transition sate, C-Inter mediate ,D-transtion state (YA) (I) Exothermic (II) B(III) F(IV) A Basic informatin. |
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| 8. |
The product of the reaction gives below is: A. B. C. D. |
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Answer» Correct Answer - A |
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| 9. |
Tick your answer in the given box |
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Answer» Correct Answer - `{:(yes-,a,b,c,d,f,h),(on-,e,g,i,j,k,):}` 3, Anyl, neopantyl ,bridage head halide do not show `S_(N^(2))` |
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| 10. |
The product of the reaction gives below is: A. B. C. D. |
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Answer» Correct Answer - A |
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| 11. |
Match the chemical conversion in List-I with the approprotae reagents in List-II and select the correct answer using the code given below this list- ,A. `{:(P,Q,R,S),(2,3,1,4),(,,,):}`B. `{:(P,Q,R,S),(3,2,1,4),(,,,):}`C. `{:(P,Q,R,S),(2,3,4,1),(,,,):}`D. `{:(P,Q,R,S),(3,2,4,1),(,,,):}` |
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Answer» Correct Answer - A |
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| 12. |
In `S_(N)2` reactions, the correct order of reactivity for the following compounds: `CH_(3)CI,CH_(3)CH_(2)CI,(CH_(3))_(2)CHCI` and `(CH_(3))_(2)C CI` is:A. `CH_(3)Clgt(CH_(3))_(2)CHClgtCH_(3)CH_(2)Clgt(CH_(3))_(3)C Cl`B. `CH_(3)Cl gtCH_(3)CH_(2)Cl gt (CH_(3))_(2) CHCl gt(CH_(3))_(3)C Cl`C. `CH_(3) CH_(2)Cl gt CH_(3)Cl gt (CH_(3))_(2)CHCl gt(CH_(3))_(2)C Cl`D. `(CH_(3))_(2) CHCl gtCH_(3)CH_(2)Cl gtCH_(3)Cl gt(CH_(3))_(3)C Cl` |
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Answer» Correct Answer - B |
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| 13. |
The increasing order of reactivity of the following halides for the `S_(N)1` reaction is I.`CH_(3)CH(CI)CH_(2)CH_(3)` `II . CH_(3)CH_(2)CH_(2)Cl` III. `p. -H_(3)CO-C_(6)H_(4)-CH_(2)Cl`A. `(II) lt(II)lt(I)`B. `(II)lt(I)lt(III)`C. `(I)lt(III)lt(II)`D. `(II)lt(III)lt(I)` |
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Answer» Correct Answer - B |
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| 14. |
Increasing the concentratuion of an electropille in a typical `S_(N^(2))` reaction by reaction by a factor of 3 and the concentration of the nuckleophile by a factor of 3 will change the reaction rate to:A. Increase by a factor of 6B. Increase by factor of 9C. decrease by a factor of 3D. Ramain about the same |
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Answer» Correct Answer - b rate of `S_(N^(2))=K`[substreate][Nu] |
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| 15. |
Increasing the concentratin of a nucleophile in a typical `S_(N^(2))` reaction by a factor of 10will cause the reaction rate to:A. Increase by a factor of 10B. Increase by factor of `10^(2)`C. Decrease by a factor of 10D. Remain about the same |
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Answer» Correct Answer - a rate of `S_(N^(2))=K`[substreate][Nu] |
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| 16. |
Decresing the concentration of an electrophile in a typical `S_(N^(2))` reaction by a factor og 3 will cause the reacton ratio to:A. Increase by a factor of 3B. increase by factor of `3^(2)`C. decrese by a factor of 3D. remain about the same |
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Answer» Correct Answer - c rate of `S_(N^(2))=K`[substreate][Nu] |
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| 17. |
which of the following reactant is used to obatin above compound (A) (Assume that `EtO^(-)` is used in all the reaction )A. B. C. D. |
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Answer» Correct Answer - a `to` trans eleimation `EtO^(-)` will bring about `E_(2)` elination of the reactant ,Hence we want grouip which are trans to each other . |
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| 18. |
`E_(2)` reaction `to ` Elimation bimoleculaar in the general mechanism of the `E_(2)` reaction a sroeng base abstract a proton ,a double bond forms and the leaving group leaves Identify the rate for reaction of given compounds in `E_2` reaction : A. agtBgtCgtdB. agtCgtBgtdC. bgtagtCgtDD. BgtDgtAgtC |
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Answer» (A) more good lisving group more `E_(2)` raction . (B) (P) anti -elemation (Q) C-H weak bond thean C-D ® Resonance stable alkene (s) Acidic hydrogen (c ) Consider conformer. (D) Anti elimation `beta` -hydrogen absent. |
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| 19. |
Among the following pair of reaction in which pair the second reaction is more reactive then first in `S_(N^(2))` reaction ?A. `Me_(3)C Cl+H_(2)OtoMe_(3)COH (or) Me_(3)CBRr+H_(2)OtoMe_(3)COH`B. `Me_(3)C Cl+CH_(3)OHto Me_(3)-OCH_(3)(or)underset(Me_(3)C-OH)underset(darr)(Me_(3)C-Cl+H_(2)O`C. `underset("(1m))Me_(3)C Cl+H_(2)Oto (or)underset((2m))Me_(3)C Cl+H_(2)O`D. All of these |
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Answer» Correct Answer - d (d) `S_(N^(1))` reaction depends On : (1) leaving group tendencty (2) Conc of subsyrrete (3) Dielectric constant of solvnt. |
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| 20. |
Select whether the following reagent combination will result in eliminataion is substition reaction s leasding to the major product. |
| Answer» `3^(@)`alkyl halide , do not show `S_(N^(2))` | |
| 21. |
Which compound undergoes nucleophilic substition with NaCN at the fastest rate?A. B. C. D. |
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Answer» Correct Answer - a (a) Rate of `S_(N^(2))prop(1)/("Steric crowing near to" "reaction centre")` |
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| 22. |
Which of the following is most reactive towards nucleophilic substitution reaction?A. `CH_(2)=CH-C l`B. `C_(6)H_(5)Cl`C. `CH_(3)CH=CHCl`D. `ClCH_(2)-CH=CH_(2)` |
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Answer» Correct Answer - d rate of `S_(N^(2) ) prop `L.G tendency `prop (1_/("partial D.B.characters in C-Xbond")` |
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| 23. |
in each of the following sections three organic halogen compunnds arae listed , in the box given entera number (1 to 3) indicating the of reactivity of the desigented (1 is most reactive and 3 is ,east).A. `S_(N^(1))`Substitution by `NaoCOCH_(3) "in methanol"` ` 1. CH_(3)CH_(2)CH_(2)square2. (CH_(3))_(2)CHBrsquare3. CH_(2)=CHCH_(2)_(2)Brsquare`B. `S_(N^(1))`Substitution byNal in acetone : ` 1. C_(6)H_(5)Cl 2. C_(6)H_(65)CH_(2)Clsquare3. C_(6)H_(5)CHClCH_(3)square`C. `S_(N^(1))`Substitution by NaCn in methanol : ` 1. CH_(3)CH_(2)Cl 2. CH_(3)CH_(2)Fsquare3. CH_(3)CH_(2)Isquare`D. `S_(N^(1))`Substitution by `NaSCH_(3) `in methanol : ` 1. (CH_(3)_(2)CHCH_(2)Brsquare2. CH_(3)CH_(2)CHBrCH_(2)CH_(3)square3. (CH_(3))_(3)CCH_(2)Brsquare` |
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Answer» (a) `1^(@)` resonance stabized transition state will be more reactive . (b) `1^(@)` resonance stabilized transition state will be will more reactice . (c ) Good leaving group. |
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| 24. |
Which of the following graph represents correct graph fopr `S_(N^(1))` reaction:A. B. C. D. |
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Answer» Correct Answer - A::C (c ) Rate of `S_(N^(1))`prop stabiliity of `C^(o+)` in R.D.S. |
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| 25. |
Which of the foollowing represents the correct graph for `S_(N^(2))` reaction ?A. B. C. D. |
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Answer» Correct Answer - a (a) rate Of `S_(N^(2)) prop (1)/("steric crowding near to raction centre")` |
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| 26. |
principal organic product of the reaction will be :A. B. C. D. |
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Answer» Correct Answer - b (b) `(S_(N^(2)))to` Inversion of configurtion at reaction centre. |
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| 27. |
3-menthyl-pent-2-ene on reaction with HBr in presence of peroxide forms an addition product. The number of possible stereoisomers for the product isA. sixB. zeroC. twoD. four |
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Answer» Correct Answer - D |
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| 28. |
The compound that will react most readily with `NaOH` to from methanol isA. `(CH_(3))_(4)N^(+)l^(-)`B. `CH_(3)OCH_(3)`C. `(CH_(3))_(3)S^(+)l^(-)`D. `(CH_(3))_(3)Cl` |
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Answer» Correct Answer - A |
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| 29. |
The product of following reaction is A. `C_(6)H_(5)OC_(2)H_(5)`B. `C_(2)H_(5)OC_(2)H_(5)`C. `C_(6)H_(5)OC_(6)H_(5)`D. `C_(6)H_(5)l` |
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Answer» Correct Answer - A |
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| 30. |
The following compound on hydrolysis in equeous acetone will give . A. k and LB. only KC. L and MD. only M |
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Answer» Correct Answer - A |
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| 31. |
Match the colum: |
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Answer» Correct Answer - `a-p,W;b-q,x;c-r,y;d-s,z` For `S_N^(1))=. 3^(@)gt2^(@)gt 1^(@)` ltbRgt For `S_(N^(2))implies 3^(@)lt 2^(@)lt 1^(@)` |
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| 32. |
statement -1 : `CH_(3)-CH_(2)-Cl+Nal overset("Acetone")toCH_(3)-CH_(2)-I +NaCldarr` statement -2 Actone is polar Nal gt NaBr gt Na Cl the last being virtully insoluble in this dsolvent and a`1^(@) and 2^(@)` chlro alkane in actone is competely driven to the side of odoalkane by the precipition reaction reaction .A. Statement _2 is true ,statement-2 is true and staement -2 is correct explanion statement -1.B. Stalement -1 true ,statement -2 is true and stement -2 is correct explanation for for Statement -1C. Statement -1 is true statement -2 false.D. Statement -1 os false ,statement -2 is true . |
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Answer» Correct Answer - C the reaction is finkelaten reaction . Acetone is polar aprotic solvent |
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| 33. |
Match the column : |
| Answer» Consider basic information | |
| 34. |
Match the column : |
| Answer» Consider cope eleimation in ehich sy elimnation take place | |
| 35. |
` x,y,z araea mole used sum of [X+Y+Z=] |
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Answer» 2 mole `NaNH_(2)` for `E_(2)` 1 mole acid -xbase reation (2) 2 mole `NaNH_(2) for E_(2)` (3) mole `NaNH_(3)` for `E_(2)` and 1 mole for acid bs. |
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| 36. |
Rank the following in order of decreasing rate of solvlysis with aqueous ethanol `("faster"to "slowest")`A. 2gt1gt3B. 1gt2gt3C. 2gt3gt1D. 1gt3gt2 |
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Answer» Correct Answer - C the reaction is finkelaten reaction . (c ) rate of solvolysis `prop` stability of `C^(o+)` |
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| 37. |
Which of the major product expected from the following `S_(N^2))` reaction ? A. B. C. D. |
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Answer» Correct Answer - b Cl is best L.G .& inversion of cofiguration takes place. |
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| 38. |
`C_(6)H_(13)Br_OH^(-)to C_(6)H_(13)OH+Br^(-)` is an example of :A. Nucleophilic additionB. Nucleophilic substitionC. Electrophillic addtionD. Electrophilic substition |
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Answer» Correct Answer - b Replacement of by OH so nucleophilic substituion. |
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| 39. |
`S_(N^(1))and S_(N^(2))` reactions areA. Both sterespecticB. Both stereoselectiveC. Stereoselective and Strerepselectfic respectivlyD. Stereoselective and Strerepselective respectivly |
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Answer» Correct Answer - b,c (c ) |
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| 40. |
in which of following reaction rarrgement take place wth change in carbon skeleton ?A. `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-^(o+)CH_(2)`B. `CH_(3)-CH_(2)CH_(2)^(o+)`C. `CH_(3)-underset(CH_(3))underset(|)CH-CH_(2)-^(o+)CH_(2)`D. `CH_(3)-CH^(o+)-CH_(3)` |
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Answer» Correct Answer - a During `H^(Ө)` shifing carbon skelton do not change . |
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| 41. |
in which of the following reaction resomnance stbilized product will form ?A. B. C. D. All of these |
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Answer» Correct Answer - d Carbocation rearrange towards a more stable carbocation is formed . |
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| 42. |
What will be the majo product of each of the two reaction shown bnelow? A. 1-X,2-XB. 1-Y,2-XC. 1-X,2-YD. 1-Y,2-Y |
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Answer» Correct Answer - b In reaction (a) carbanion type trantion therfore Hoffmann alkene is major . In reaction (2) alkene type transition therefore sayzeff alkene aalkene in major |
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| 43. |
Which of the following carbocation will undergo rarrangement ?A. B. C. `CH_(3)-underset(CH_(3))underset(|)CH -C^(o+)=O`D. `CH_(3)-NH-^(o+)CH-underset(CH_(3))underset(|)Ch-CH_(3)` |
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Answer» Correct Answer - b For each carboaaction rerrangement there must be some driving force. carocation rearranges only when more carbocatio is formed . |
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| 44. |
consider the nucleopholic attacks given below ,select in each pair that shows the greater `S_(N^(2))`?A. `(I),(II),(VI),(VIII)`B. `(II),(III),(V),(VIII)`C. `(I),(III),(V),(VIII)`D. `(I),(III),(V),(VII)` |
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Answer» Correct Answer - C the reaction is finkelaten reaction . (a) `Br^(o-)` is best L.G than `-O-overset(O)overset(||)C-Me` `(B) `SH^(o-)` is best `NU^(o-)` then MeSH` (c ) `Cl^(o-)` si best `NU^(o-)` than `I^(o-)` is better `NU^(o-)` than `Cl^(o-)` |
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| 45. |
`S_(N^(1))and S_(N^(2))` products are same with (excluding stereoisomer):A. B. C. D. `Ph-undersetunderset(CH_3)(|)CH-undersetunderset(Cl)(|)CH-CH_3` |
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Answer» Correct Answer - C the reaction is finkelaten reaction . (c ) In case of rearrangement `S_(N^(1)) and S_(N^(2))` product are different . |
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| 46. |
+`NaIunderset("Acetone") to "product", S_(N^(2))` product of the reaction is :A. B. C. D. |
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Answer» Correct Answer - b (b) inverted product on tha ae carbon where laeving group is present . |
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| 47. |
Which of the following reaction is an elimination reaction ?A. B. C. D. Both (a) and (B) |
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Answer» Correct Answer - d (d) in the reaction ,formation of a `pi` -bond , Elimation . |
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| 48. |
For each the following amines (a though D) ,Exhaustive methylation (treatment with excess mrthy iosdile ) folloeing by hoffmann elimination (heating with AgOH) ,repesated as necssary , removes the niotrogen atomin the form to reamove the ntirogen aatom in the form of trmethylamine .In dicatte the number of respetivet Hoffmann eliinataion required toi reamove the nitrogen by a number (1to 4) in the desihnsataead answer sheet . |
| Answer» Number of C-N bond equal ot number of hoffmann exhutive elimaination | |