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. |
The structure of the major product formed in the following reaction is: A. B. C. D. |
| Answer» Correct Answer - D | |
| 2. |
`CH_(3)Br +Nu^(Theta) rarr CH_(3)-Nu +Br^(Theta)` The decreasing order of the rate of the above reaction with nucleophiles `Nu^(Theta) A` to `D` is- `[Nbar(u) =(A) phO^(-), (B) AcO^(-), (C)H bar(O),(D) CH_(3)bar(O)]`A. `D gt C gt A gt B`B. `D gt C gt B gt A`C. `A gt B gt C gt D`D. `B gt D gt C gt A` |
| Answer» Correct Answer - A | |
| 3. |
Statement-I: Iodination of akanes is carried out by heat in presence of readucing agent. Because Statement-II: Iodination of alkanes takeplace explosively.A. Statement-I is True, Statement-II is True, Statement-II is a correct explanation for Statement-IB. Statement-I is True, Statement-II is True, Statement-II is NOT a correct explanation for Statement-IC. Statement-I is True, Statement-II is False.D. Statement-I is False, Statement-II is True. |
| Answer» Correct Answer - D | |
| 4. |
What is the order of reactivity of the following compounds towards nucleophilic substitution? A. `I lt II lt III lt IV`B. `IV lt III lt II lt I`C. `IV lt I lt II lt III`D. `IV lt II lt I lt III` |
| Answer» Correct Answer - C | |
| 5. |
The order of reactivities of the following alky halides for an `S_(N)2` reaction is .A. `RF gt RCI gt R-Br gt R-I`B. `R-F gt R-Br gt R-CI g R-I`C. `R-CI gt R-Br gt R-F gt R -I`D. `R-I gt R-Br gt R-CI gt R-F` |
| Answer» Correct Answer - D | |
| 6. |
Statement-I: Vinylic halides are reactive towards nucleophilic substitution reaction. Because Statement-II: Reactivity is due to the polarity of carbon-halogen bond.A. Statement-I is True, Statement-II is True, Statement-II is a correct explanation for Statement-IB. Statement-I is True, Statement-II is True, Statement-II is NOT a correct explanation for Statement-IC. Statement-I is True, Statement-II is False.D. Statement-I is False, Statement-II is True. |
| Answer» Correct Answer - D | |
| 7. |
Statement-I:Primay benzylic halides are more reactive than primary alkyl halides towards `S_(N^(1))` reaction. Because Statement-II: Reactivity depends upon the nature of the nucleophile and the solvent.A. Statement-I is True, Statement-II is True, Statement-II is a correct explanation for Statement-IB. Statement-I is True, Statement-II is True, Statement-II is NOT a correct explanation for Statement-IC. Statement-I is True, Statement-II is False.D. Statement-I is False, Statement-II is True. |
| Answer» Correct Answer - B | |
| 8. |
Of the following statements , which are true for `S_(N)2` reaction. (a) Tertiar alkyl halides reacts faster than secondary. (b) The absolute configuration of product is opposite to that of the reactant when an optically active substrate is used. (c) The used shows first order kinetics. (d) The rate of the reaction depends markedly on the nucleophilicity of the attacking reagent. (e) The mechanism is one step. (f) Carbocations are intermediate. (g) Rate `prop` [Alkyl][halides] (h) The rate of the reaction depends on the nature of the leaving group. |
| Answer» Correct Answer - (a)F (b) T (c) F(d) T (e) T (f) F (g) F (h) T | |
| 9. |
Which of the following is least reactive in a nucleophilic substiution reactionA. `CH_(2)=CHCI`B. `CH_(3)CH_(2)CI`C. `CH_(2)=CHCH_(2)CI`sD. `(CH_(3))_(3)C-CI` |
| Answer» Correct Answer - A | |
| 10. |
Reactivity order of halides of dehydrohalogenation isA. `R -F gt R -CI gt R -Br gt R -I`B. `R -I gt R -Br gt R -CI gt R -F`C. `R -I gt R -CI gt R -Br gt R-F`sD. `R -F gt R -I gt R -Br gt R -CI` |
| Answer» Correct Answer - B | |
| 11. |
Given the total number of isomers, including stereoisomers, obtained on monochlorination of isopentane.A. 2B. 3C. 4D. 1 |
| Answer» Correct Answer - A | |
| 12. |
Arrange the following in the increasing order of their ability as a leaving group: (a) `CH_(3)S^(-). CH_(3)O^(-), CF_(3)^(-)` and `F^(-)` (b) `CF_(3)SO_(3)^(-), CH_(3)SO_(3)^(-)` and `CH_(3)COO^(-)` |
| Answer» Correct Answer - (a) `CF_(3)^(-) lt CH_(3)O^(-) lt CH_(3)S^(-)`; (b) `CH_(3)COO^(-) lt CH_(3)SO_(3)^(-) lt CF_(3)SO_(3)^(-)` | |
| 13. |
2-chloro-2-methylpentane on reaction with sodium methoxide in methanol yields: (a) `C_(2)H_(5)CH_(2)overset(CH_(3))overset(|)underset(CH_(3))underset(|)(C)-OCH_(3)` (b) `C_(2)H_(5)CH_(2)underset(CH_(3))underset(|)(C)=CH_(2)` (c) `C_(2)H_(5)CH_(2)=underset(CH_(3))underset(|)(C)-CH_(3)`A. (a) and (b)B. All of theseC. (a) and (b)D. (c) only |
| Answer» Correct Answer - B | |
| 14. |
Consider the following anions. (I) `CF_(3)-overset(O)overset(||)underset(O)underset(||)(S)-O^(-)` (II) `C_(6)H_(5)-overset(O)overset(||)underset(O)underset(||)(S)-O^(-)` (III) (IV) `CH_(3)-overset(O)overset(||)(C)-O^(-)` When attached to `sp^(3)`-hybridized carbon, their leaving group ability in nucleophilic substitution reactions decreases in the orderA. `I gt II gt III gt IV`B. `I gt II gt IV gt III`C. `IV gt I gt II gt III`D. `IV gt III gt II gt I` |
| Answer» Correct Answer - B | |
| 15. |
`C_(2)H_(5)Br overset(AgCN)rarr X overset("Reduction")underset(Zn-Hg//HCI)rarr Y`, Here, `Y` is:-A. n-propylamineB. IsopropylamineC. Ethyl methyl amineD. Ethylamine |
| Answer» Correct Answer - C | |
| 16. |
`Ph-overset(Me)overset(|)underset(H)underset(|)(C)-OH overset(SOCI_(2))underset("in" C_(5)H_(5)N)rarr`, Which statement is true for the above reaction?A. Retention of configurationB. Inversion of configurationC. Inversion and Retention bothD. None |
| Answer» Correct Answer - B | |
| 17. |
`CH_(3)CH_(2)CHCI_(2) overset(Aq.KOH)rarr`? |
| Answer» Correct Answer - `CH_(3)-CH_(2)-CHO` | |
| 18. |
Consider the following reaction sequence, `CH_(3)C-= CH overset(aq.H_(2)SO_(4))underset(H_(2)SO_(4))rarr A overset(PCI_(5))underset(Heat)rarrB` The products `(A)` and `(B)` are, respectively,A. `CH_(3)COCH_(3)` and `CH_(3)C CI_(2)CH_(3)`B. `CH_(3)CH_(2)CHO` and `CH_(3)CH_(2)CHCI_(2)`C. `CH_(3)CHOHCH_(3)` and `CH_(3)CHCICH_(3)`D. `CH_(3)CH_(2)CH_(2)OH` and `CH_(3)CH_(2)CH_(2)CI` |
| Answer» Correct Answer - A | |
| 19. |
For an `S_(N^(2))` reaction which of the following statements are true:-A. The rate of reaction is independent of the concentration of the nucleophileB. The nucleophile attacks the C-atom on the side of the molecule opposite to the group being displacedC. The reaction proceeds with simultaneous bond formation and ruptureD. None of these |
| Answer» Correct Answer - B::C | |
| 20. |
Which of the following reactions depict the nucleophilic substitition of `C_(2)H_(5)Br` :-A. `C_(2)H_(5)Br + C_(2)H_(5)SNa rarr C_(2)H_(5)SC_(2)H_(5) +NaBr`B. `C_(2)H_(5)Br overset(Na+C_(2)H_(5)OH)rarr C_(2)H_(6) +HBr`C. `C_(2)H_(5)Br +AgCN rarr C_(2)H_(5)NC +AgBr`D. `C_(2)H_(5)Br +KOH rarr C_(2)H_(5)OH +KBr` |
| Answer» Correct Answer - A::C::D | |
| 21. |
The compound formed on heating chlorobenzen with chloral in the presence of concentrated sulphuric acid is-A. GammaxeneB. DDTC. FeronD. Hexa chloro ethane |
| Answer» Correct Answer - B | |
| 22. |
In what condition extraction of `Mg` is possible by `MgO` using carbon reduction method. |
|
Answer» According to Ellinghan diagram reduction of metal oxide with carbon will occur when the accompaying `DeltaG` is negative. Such reduction become feasible at very high temperature. `MgO` can only be reduced by carbon at the temperature approximate `2000^(@)C`. `Mg` form by heating `MgO` and `C` at `2000^(@)C`, at this temperature or above `C` reduces `MgO`. The gaseous mixture of `Mg` and `CO` was then cooled very repidly to deposit the metal. This quenching or shockooling was necessary as the reaction is reversible, and if cooled slowely the reaction will come to equilibrium further to teh left and we get `Mg`. `Mg + C hArr Mg +CO` Limitations of Ellinghan Diagram: (a) The graph simply indicates whether a reaction is possible or not i.e. the tendency of reduction with a reducing agent is indicated. This is so because it is based only on the thermodynamic concepts. It doe not say about the kinetics of teh reduction process (Cannot answer questions like how fast it could be?) (b) The interpretation of `DeltaG^(Theta)` is based on `K(DeltaG^(Theta) =- RT` InK). Thus it is persumed that the reactants of products are in equilibrium. `M_(x)O +A_(red) 1 xM +AO_(OX)` |
|
| 23. |
(sec-Butyl bromide) undergoes alkaline hydrolysis by :A. `S_(N^(2))`B. `S_(N^(1))`C. `S_(N^(1))` and `S_(N^(2))`D. none of these |
| Answer» Correct Answer - C | |
| 24. |
Ethylene reacts bromine to form-A. ChloroethaneB. Ethylene dibromideC. CyclohexaneD. 1-bromo propane |
| Answer» Correct Answer - B | |
| 25. |
Match the following.A. `{:(Column-I,Column-II),((Statements),"(Consistent path of reaction)"),("Reaction are concerted",(p)S_(N)1):}`B. `{:(Column-I,Column-II),((Statements),"(Consistent path of reaction)"),(CH_(3)X "cannot react",(q)S_(N)2):}`C. `{:(Column-I,Column-II),((Statements),"(Consistent path of reaction)"),(3^(@)R-X gt2^(@)R-x 1^(@)R-X,(r)E_(1)):}`D. `{:(Column-I,Column-II),((Statements),"(Consistent path of reaction)"),(R-I " reacts faster than" R-CI,(s)E_(2)):}` |
| Answer» Correct Answer - A::B::C::D | |
| 26. |
Match the following.A. `{:(Column-I,Column-II),(("Reactions"),"(Characteristrics)"),(CH_(3)CH_(2)CH=CH_(2)overset(HBr)rarr,(p)"Bimolecular"):}`B. `{:(Column-I,Column-II),(("Reactions"),"(Characteristrics)"),(CH_(3)CH_(2)CH=CH_(2)overset(HBr"Peroxide")rarr,(q)"Carbocation intermediate"):}`C. `{:(Column-I,Column-II),(("Reactions"),"(Characteristrics)"),(PhCH(CH_(3))OHoverset(SOCI_(2))rarr,(r)"Regioselective"):}`D. `{:(Column-I,Column-II),(("Reactions"),"(Characteristrics)"),(PhCH(CH_(3))OHoverset(HBr)rarr,(t)"Stereospectific reaction"):}` |
| Answer» Correct Answer - A::B::C::D | |
| 27. |
Which of the following is an `S_(N^(2))` reaction:-A. `CH_(3)CH_(2)Br +KOH rarr CH_(3)CH_(2)OH +KBr`B. `CH_(3)CH_(2)Br +CH_(3)CH_(2)ONa rarr CH_(3)CH_(2)OCH_(2)CH_(3)+NaBr`C. `(CH_(3))_(3)CBr +KOH rarr (CH_(3))_(3) COH +KBr`D. `CH_(3)-CH_(2)-overset(CH_(3))overset(|)underset(CH_(3))underset(|)(C)-Br +KOH rarr CH_(3)CH_(2)-overset(CH_(3))overset(|)underset(CH_(3))underset(|)(C)-OH +KBr` |
| Answer» Correct Answer - A::B | |
| 28. |
Consider the following bromides,- The correct order of `S_(N)1` reactivity isA. `A gt B gt C`B. `B gt C gt A`C. `B gt A gt C`sD. `C gt B gt A` |
| Answer» Correct Answer - B | |
| 29. |
In `S_(N^(1))` the first step involves the formation ofA. free radicalB. carbanionC. carbocationsD. final products |
| Answer» Correct Answer - C | |
| 30. |
To form alkane isonitrile, alkyl halide is reacted with:A. `KCN`B. `AgCN`C. `HCN`D. `NH_(4)CN` |
| Answer» Correct Answer - B | |
| 31. |
Statement-I: Boiling point of alkyl halide increases with increases in molecular weight. Because Statement-II: Boiling point of alkyhalides are in the order `RI gt RBr gt RCI gt RF`.A. Statement-I is True, Statement-II is True, Statement-II is a correct explanation for Statement-IB. Statement-I is True, Statement-II is True, Statement-II is NOT a correct explanation for Statement-IC. Statement-I is True, Statement-II is False.D. Statement-I is False, Statement-II is True. |
| Answer» Correct Answer - B | |
| 32. |
An organic compound A has molecular formula `C_(10)H_(17)Br` and it is non-resolvable. A does not decolourize brown colour of bromine water solution. A on treatement with `(CH_(3))_(2 COK//(CH_(3))_(3)COH` yields `B` as majot product. B on treatment with `H_(2)//Pt` yields `(C_(10)H_(16))` which on treatment with `CI_(2)//hv` yields three monochloro derivative. Also B on boiling with acidic permanganate solution yields `C(C_(10)H_(16)O_(3))C`. on heating with sodalime yields `D(C_(9)H_(16)O).D` on reducing with `LiAIH_(4)` followed yields `C(C_(10)H_(16)O_(3)).C` on heating with sodalime yields `D(C_(9)H_(16)O).D` on reducing with `LiAIH_(4)` followed by heating product with concentrated `H_(2)SO_(4)` yields `E(C_(9)H_(16))` as major product. E on treatment with ozone followed by work-up with `Zn-H_(2)O` yields 6-Ketononanal. Compound A is:A. B. C. D. none of these |
| Answer» Correct Answer - A | |
| 33. |
An organic compound A has molecular formula `C_(10)H_(17)Br` and it is non-resolvable. A does not decolourize brown colour of bromine water solution. A on treatement with `(CH_(3))_(2 COK//(CH_(3))_(3)COH` yields `B` as majot product. B on treatment with `H_(2)//Pt` yields `(C_(10)H_(16))` which on treatment with `CI_(2)//hv` yields three monochloro derivative. Also B on boiling with acidic permanganate solution yields `C(C_(10)H_(16)O_(3))C`. on heating with sodalime yields `D(C_(9)H_(16)O).D` on reducing with `LiAIH_(4)` followed yields `C(C_(10)H_(16)O_(3)).C` on heating with sodalime yields `D(C_(9)H_(16)O).D` on reducing with `LiAIH_(4)` followed by heating product with concentrated `H_(2)SO_(4)` yields `E(C_(9)H_(16))` as major product. E on treatment with ozone followed by work-up with `Zn-H_(2)O` yields 6-Ketononanal. Compound B is:A. B. C. D. |
| Answer» Correct Answer - C | |
| 34. |
The reaction proceeds by the mechanismA. `S_(N^(1))`B. `S_(N^(2))`C. `S_(N^(I))`D. `S_(E^(2))` |
| Answer» Correct Answer - B | |
| 35. |
The product formed in the reaction A. B. C. D. |
| Answer» Correct Answer - B | |
| 36. |
Identify the product when A reacts with A. `Br_(2)//Fe`B. `Br_(2)//C CI_(4)`C. `NBS`D. `HBr` |
| Answer» Correct Answer - A::B::C | |
| 37. |
Which is faster in the following pairs of halogen compounds undergoing `S_(N)2` reactions?A. B. C. D. |
| Answer» Correct Answer - A::B::C::D | |
| 38. |
`R -Mg-Br(A)` on reaction with `H_(2)O` forms a gas `(B)`, which occupied `1.4 L//g` at `NTP`. What is product when `R-Br` reacts with benzene in presence of `AICI_(3)`? |
| Answer» Correct Answer - A::B::C::D | |
| 39. |
Why `AI` can reduce oxide of `Cr` but not reduce oxide of `Mg` and `Ca` at `800^(@)C`? |
| Answer» A metal can reduce the oxide of metal placed above in the diagram. Due to more negative free energy. Such that, `AI` can reduce `Cr` but not `Mg` or `Ca`. | |
| 40. |
Nucleophilic substitution reactions generally expressed as `Nu^(-) +R-L rarr R-Nu +L^(-)` Where `Nu^(-) rarr` Nucleophile , `R-L rarr` substrate, `L rarr` leaving group The best leaving groups are those that become the most stable ions after they depart. since most leaving group leave as a negatibe ion, the best leaving groups are those ions that stabilize a negative charge most effectively. A good leaving group should be (a) electron-withdrawing to polarize the carbon (b) stable once it has left (not a strong base) (c) polaristable to maintain partial bonding with the carbon in the transition state (both `S_(N)1` and `S_(N)2)`. This bonding helps to stabilise the transition state and reduces the activation energy. Among the following which is feasible?A. `X^(-) +CH_(3) -CH_(2)-H rarr CH_(3)-CH_(2)-X +H^(-)`B. `X^(-)+CH_(3)-OH rarr CH_(3)-X +overset(bar(O)H)`C. `X^(-) +H_(3)C -underset(H)underset(|)overset(o+)(OH)rarr CH_(3)-X +H_(2)O`D. `X^(-)+CH_(3)-CH_(3)rarr CH_(3)-X +overset(bar(CH_(3)))` |
| Answer» Correct Answer - C | |
| 41. |
Nucleophilic substitution reactions generally expressed as `Nu^(-) +R-L rarr R-Nu +L^(-)` Where `Nu^(-) rarr` Nucleophile , `R-L rarr` substrate, `L rarr` leaving group The best leaving groups are those that become the most stable ions after they depart. since most leaving group leave as a negatibe ion, the best leaving groups are those ions that stabilize a negative charge most effectively. A good leaving group should be (a) electron-withdrawing to polarize the carbon (b) stable once it has left (not a strong base) (c) polaristable to maintain partial bonding with the carbon in the transition state (both `S_(N)1` and `S_(N)2)`. This bonding helps to stabilise the transition state and reduces the activation energy. (I) `CI^(-)` (II) `CH_(3)O^(-)` (III) `CH_(3)S^(-)` (IV) `I^(-)` The correct order of increasing leaving group capability of above anionsA. `III lt IV lt II lt I`B. `II lt III lt I lt IV`C. `II lt IV lt III lt I`D. `I lt III lt II lt IV` |
| Answer» Correct Answer - B | |
| 42. |
Nucleophilic aliphatic substitution reaction is mainly of two types: `S_(N)1` and `S_(N)2`. The `S_(N)1` mechanism is a two step process. Reaction velocity of `S_(N)1` reaction depends only on the concentration of the substrate. Since product formation takes place by the formation of carbocation, optically active substrate gives (+) and (-) forms of the product. In most of the cases the product usually consits of `5-20%` inverted product and `80-95%` racemised species. The more stable the carbocation, the greater is the proportion of racemisation. In solvolysis reaction, the more nucleophilic the solvent, the greater is the proportion of inversion. For the gives reaction, Which substrate will give maximum racemisation?A. B. C. D. |
| Answer» Correct Answer - C | |
| 43. |
The reaction , `CH_(3)Br +OH^(-)rarrCH_(3)OH+Br^(-)` obeys the mechanismA. `S_(N^(1))`B. `S_(N^(2))`C. `E_(1)`D. `E_(2)` |
| Answer» Correct Answer - B | |
| 44. |
`SN^(1)` reaction is feasibole in-A. B. C. D. |
| Answer» Correct Answer - A | |
| 45. |
Following reaction: `(CH_(3))_(3)C-Br +H_(2)O rarr (CH_(3))_(3)C-OH +HBr` is an example of -A. Elimination reactionB. Free radical substitutionC. Nucleophilic substitutionD. Electrophilic substitution |
| Answer» Correct Answer - C | |
| 46. |
In the adddition of `HBr` to propene in the absence of peroxides, the first step involves the addition of-sA. `H^(+)`B. `Br^(-)`C. `H^(+)`D. `Br^(+)` |
| Answer» Correct Answer - A | |
| 47. |
In the reaction `OCH_(3)overset(HBr)rarr` the product are:A. B. C. D. |
| Answer» Correct Answer - D | |
| 48. |
Alkyl iodide can be prepared by:-A. `ECH_(2)COOAg +I_(2) overset(C CI_(4))underset(Delta)rarr RCH_(2)I`B. `RCH_(2)CI +NaI overset("acetone")underset(Delta)rarr RCH_(2)I +NaCI`C. `R-OH +HI rarr RI +H_(2)O`D. `CH_(4)+I_(2) rarr CH_(3)I` |
| Answer» Correct Answer - B::C | |
| 49. |
Following reaction is A. `E_(1)`B. `S_(N^(1))`C. `E_(2)`D. `S_(N^(2))` |
| Answer» Correct Answer - D | |
| 50. |
In `S_(N^(1))` reaction an optically active substrates mainly givesA. Retention in configurationB. Inversion in configurationC. Racemic productD. No products |
| Answer» Correct Answer - C | |