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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.
| 151. |
An orgnic compound (A) on reduction gave a compound (B). Upon treatment with `HNO_(2)` ,(B) gave ethyl alcohol and on warming with `CHCI_(3)`, and alcoholic KOH, (b) gave offensive smell. The compound (A) is:A. `CH_(3)CN`B. `C_(2)H_(5)CN`C. `CH_(3)NH_(2)`D. `CH_(3)NC` |
| Answer» Correct Answer - A | |
| 152. |
Propene is allowed to react with m-chloroperoxybenzoic acid. The product (A) is then reduced with `LiAIH_(4)` in dry ether to give (B). `CH_(3)CH=CH_(2)overset(MCPBA)rarrAunderset(2. H_(3)O^(+))overset(1. LIAIH_(4))rarrB` The structure of the product (B) is :A. `CH_(3)CHOHCH_(2)OH`B. `CH_(3)CH_(2)CH_(2)OH`C. `CH_(3)CHOHCH_(3)`D. |
| Answer» Correct Answer - C | |
| 153. |
When `CH_(2)=CH-COOH` is reduced with `LIAIH_(4)`, the compound obtained will be-A. `CH_(3)-CH_(2)-CH_(2)OH`B. `CH_(3)-CH_(2)-CHO`C. `Ch_(3)-CH_(2)-COOH`D. `CH_(2)=CH-CH_(2)OH` |
| Answer» Correct Answer - D | |
| 154. |
Arrange in order of decresing trend towards `S_(E)` reactions, `{:("Chlorobenzen","Benzene","Anilinium chloride","Toluene"),(I,II,III,IV):}`A. `IgtIgtIIIgtIV`B. `IIIgtIgtIIgtIV`C. `IVgtIIgtIgtIII`D. `IgtIIgtIIIgtIV` |
| Answer» Correct Answer - C | |
| 155. |
`p-` chloroaniline and anilinium hydrogen chloride can be distinguished byA. Sandmeyer reactionB. `NaHCO_(3)`C. `AgNO_(3)`D. Carbylamine test |
| Answer» Correct Answer - C | |
| 156. |
Examine the following two structures for the anilinium ion and choose the correct statement from the ones given below:A. It is not an aC Ceptable canonical structure because carbonium ions are less stable then ammonium ionsB. It is not an aC Ceptable canonical structure because it is aromaticC. It is not an aC Ceptable canonical structure because the nitrogen haas 10 valence electronsD. It is an aC Ceptable canonical structure |
| Answer» Correct Answer - C | |
| 157. |
The structure of Wheland intermediate obtained after the attack of `Br^(+)` on anilinium ion is:A. B. C. D. |
| Answer» Correct Answer - B | |
| 158. |
The appropriate reagent for the following transformation is A. `Zn(Hg),HCl`B. `NH_(2)NH_(2),OH^(-)`C. `H_(2)//Ni`D. `NaBH_(4)` |
| Answer» Correct Answer - B | |
| 159. |
Reagent (s) which can be used to bring about the following transformation is (are) A. `LiAIH_(4)` in `(C_(2)H_(5))_(2)O`B. `BH_(3)` in THFC. `NaBH_(4)` in `C_(2)H_(5)OH`D. Raney `Ni//H_(2)` in THF |
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Answer» `LiAIH_(4)` in `(C_(2)H_(5))_(2)O: BH_(3)` in (THF) : Raney `Ni(H_(2))` either can reduce all functional group or can reduce some of the functional group of the compound given above in reactant side. But `NaBH_(4)` is example of selective reducing agent. it can not reduce `-underset(O)underset(||)C-O-` (ester group), `-underset(O)underset(||)C-OH` (carboxylic acid group_, (epoxide group), but reduces `-CH=O` (Aldehyde group) into `-CH_(2)OH(1^(@(` alcohol) |
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| 160. |
Which of the following does not give iodoform:A. Acetic acidB. Lactic acidC. ActophenoneD. Propionic acid |
| Answer» Correct Answer - A::D | |
| 161. |
Which of the following on reduction with `LiAIH_(4)` will give ethyl alcohol ?A. `(CH_(3)CO)_(2)O`B. `CH_(3)COCl`C. `CH_(3)CONH_(2)`D. `CH_(3)COOC_(2)H_(5)` |
| Answer» Correct Answer - A::B::D | |
| 162. |
Examine the following two structures for the anilinium ion and choose the correct statement from the ones given below:A. It is not an aC Ceptable canonical structure because carbonium ions are less stable then ammonium ionsB. It is not an aC Ceptable canonical structure because it is non-aromaticC. It is not an aC Ceptable canonical structure because the nitrogen has ten valence electronsD. Both (A) & (C) |
| Answer» Correct Answer - C | |
| 163. |
Which of the following reagents are involved in the followintg transformation? A. `H_(3)O^(+)`B. `LiAIH_(4)`C. `Ethylene glycolD. Acetone and propionic acid |
| Answer» Correct Answer - A::B::C | |
| 164. |
Which of the following reagents can be used to convert benzenediazonium chloride into benzene ?A. WaterB. AcidC. Hypophosphorous acidD. HCl |
| Answer» Correct Answer - C | |
| 165. |
The number of resonating structures of aniline is :-A. 2B. 3C. 4D. 5 |
| Answer» Correct Answer - D | |
| 166. |
Which of the following compounds will dissolve in an alkali solution after it has undergone reaction with hinsberg reagent ?A. `(C_(2)H_(5))_(2)NH`B. `CH_(3)-underset(CH_(3))underset(|)N-C_(6)H_(5)`C. `CH_(3)NH_(2)`D. `C_(6)H_(5)NHC_(6)H_(5)` |
| Answer» Correct Answer - C | |
| 167. |
Statement I: Aniline on reaction with ` NaNO_2HCl` at `0^@C` followed by coupling with `beta`-naphthol gives a dark blue coloured precipitate. Statement II: The colour of the compound formed in the reaction of aniline with `NaNO_2//HCl` at ` 0^@C` followed by coupling with `beta`-naphthol is due to extended conjugation.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 | |
| 168. |
Borane is an electron deficient compound. It has only six valence eletons, so the boron atom lacks an octet. Acquiring an octet is the driving force for the unusual bonding structure found in boron compounds. As an electron deficient compound, `BH_(3)` is a strong electrophile, capable of adding to a double bond. This hydroboration of double bond is though to oC Cur in one step, with the boron atom adding to the less highly substituted end of the double bond. In transition state, the boron atom withdraws electrons from the pi bond and the carbon at theother end of the double bond acquires a partial positive charge. This positive charge is more stable on the more highly subsituted carbon atom. The second step is the oxidation of boron atom, removing it from carbon and replacing it with hydroxyl group by using `H_(2)O_(2)//OH^(bar(..))`. The simultaneous addition of boron and hydrogen to the double bond leads to a syn addition. Oxidation of the trialkyl borane replaces boron with a hydroxyl group in the same stereochemical position. Thus, hydroboration of alkenen is an example of steropecific reaction, in which different steroisomers of starting compounds react to give different steroisomers of the product. `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-CH=CH_(2)` `underset((ii)H_(2)O_(2)//OH^(bar(..)))overset((i)BH_(3)//THF)rarrZ`. `Z` is :A. B. C. D. |
| Answer» Correct Answer - B | |
| 169. |
Cyclohexanone on being heated with NaOH solution forms.A. B. C. D. |
| Answer» Correct Answer - C | |
| 170. |
Which of the following compound would be expected to decarboxylates when heated:-A. B. C. D. |
| Answer» Correct Answer - A | |
| 171. |
The gas evolved on heating `CH_(3)MgBr` in methanol is :A. EthaneB. PropaneC. MethaneD. `HBr` |
| Answer» Correct Answer - C | |
| 172. |
The correct set of the products obtained in the following reactions `RCNoverset("reduction")rarr(A),RCMunderset((ii)H_(2)O)overset((i)CH_(3)MgBr)rarr(B),overset("hydrolysis")rarr(C),RNH_(2)overset(HNO_(2))rarr(D)` The answer is :A. `{:(,A,B,C,D),((A), 2^(@)"Amine","Methyl ketone",1^(@) "Amine","Alcohol"):}`B. `{:(,A,B,C,D),((B),1^(@) "Amine","Methyle ketone",1^(@) "Amine","Alcohol"):}`C. `{:(,A,B,C,D),((C),2^(@)"Amine","Methyl ketone",2^(@) "Amine","Acid"):}`D. `{:(,A,B,C,D),((D),2^(@)"Amine","Methyl ketone",2^(@) "Amine","Aldehyde"):}` |
| Answer» Correct Answer - B | |
| 173. |
Consider the following reactions : The product (B) isA. B. C. D. |
| Answer» Correct Answer - C | |
| 174. |
The major product (A) formed in the reaction- `overset(H_(2)SO_(4))rarrA` is:A. B. C. D. |
| Answer» Correct Answer - A | |
| 175. |
`CH_(3)-CH=CH_(2)overset(NOC)rarr` Product, product is :A. `CH_(3)-underset(Cl)underset(|)CH-CH_(2)-NO`B. `CH_(4)-underset(OH)underset(|)(CH)-CH_(2)-Cl`C. `CH_(4)-CH_(2)-CH_(4)-Cl`D. `NO-CH_(2)-CH_(2)-CH_(2)-Cl` |
| Answer» Correct Answer - A | |
| 176. |
`C_(6)H_(5)-C-=C-CH_(3)underset(H_(2)SO_(4))overset(HgSO_(4))rarrA`A. B. C. `C_(6)H_(5)-underset(OH)underset(|)C=CHCH_(3)`D. `C_(6)H_(5)-CH=underset(OH)underset(|)C-CH_(3)` |
| Answer» Correct Answer - A | |
| 177. |
Picric acid is:A. B. C. D. |
| Answer» Correct Answer - C | |
| 178. |
Maximum dehydration takes place in that ofA. B. C. D. |
| Answer» Correct Answer - B | |
| 179. |
In the following `S_(N)1` reaction: `underset(S_(N)1)overset(OH^(o+))rarr(A)` is |
| Answer» Correct Answer - A mixture of d- and l- and thus racemic mixture is formed. | |
| 180. |
In the following dehydration of diol with `H_(3)PO_(4)` following product is formed such that isotopic `.^(18)O` goes `H_(2)O`. Explain. |
| Answer» Correct Answer - `3^(@)` alcohol at `C_(2)` is more basic than `2^(@)` alcohol at `C_(5)`. Henc,e intramolecular dehydration takes place such that H of `2^(@)` alcoholic group at `C_(5)` eliminated `OH` of `3^(@)` alcoholic groupa at `C_(2)`(with isotopic `.^(18)O`) | |
| 181. |
Isotopic carbon-14 in (A) appears at new position (As in B) (A) reacts with `CH_(3)Ona`. Explain. |
| Answer» Correct Answer - `CH_(3)O^(-)` (nucleophile) attacks less submituted carbon (which is C-14 in this case) forming intermediate (C). | |
| 182. |
When A given bel,ow reacts with HI products is B and not C. Explain |
| Answer» Correct Answer - Bond energy of C (vinylic )-Obond `(alpha)` is greater than that of C(alkylic)-O bond `(beta)`. Hence, when A reacts with Hi, bond `beta` forming B. | |
| 183. |
Give the product of the reaction of `Ph_(2)CHCH_(2)OH` with `HBr` and explain its formation. |
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Answer» Correct Answer - `Ph-underset(Br)underset(|)overset(Ph)overset(|)C-CH_(3)` Synchronous migration of `H^(-)` |
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| 184. |
Hydration of 3-phenylbut-1-ene in dilute `H_(3)SO_(4)` forms 2-pheylbutan -2-ol and not 3-phenylbutan-2-ol. Why ? |
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Answer» Correct Answer - `H_(2)C=CH-underset(Ph)underset(|)CH-CH_(3)overset(H^(+))rarrH_(3)C-overset(+)CH-underset(Ph)underset(|)CH-CH_(3)overset(-H)rarrH_(3)C-CH_(2)-underset(Ph)overset(+)C-CH_(3)` `underset(-H^(+))overset(H_(2)O)rarrCH_(3)CH_(2)-underset(Ph)underset(|)overset(OH)overset(|)C-CH_(3)` (Hydration gives an intermediate `2^(@)C`, which undergoes a hydride shift Although phenyl is a better migrator than `H`, migration of H oC Curs leading to a more stable `3^(@)` benzylic carbocation.) |
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| 185. |
Benzoic acid reacts with `Ca(OH)_(2)`. The product obtained on dry distilation gives-A. BenzophenoneB. AcetophenoneC. BenzaldehydeD. None of these |
| Answer» Correct Answer - A | |
| 186. |
HVZ reaction is specific for -A. Replacement of `beta-`hydrogensB. Replacement of `alpha-`hydrogensC. Replaceent of `beta-`carbonsD. Replacement of `alpha-`carbons |
| Answer» Correct Answer - B | |
| 187. |
Decreasing order of acidity of p-methoxy benzoic acid (A), p-nitrobenzoic acid (B) and benzoic acid (C) is-A. B,C,AB. A,B,CC. C,A,BD. None |
| Answer» Correct Answer - A | |
| 188. |
The most unlikely representation of resonance structure of `p`-nitrophenoxide ion is:A. B. C. D. |
| Answer» Correct Answer - C | |
| 189. |
Select the incorrect statement among the followingA. benzene undergoes predominantly electrophilic substition reactionsB. Ttoluene is more easily sulphonated than benzeneC. benzene reacts with `C Cl_(4)` in the presence of anhydrous `AlCl_(3)` to give triphenyl methyl chlorideD. benzene reacts with chlorine `(Cl_(2))` in presence of light to give benzyl chloride |
| Answer» Correct Answer - C::D | |
| 190. |
Which of the following structures correspond to the product expected, when excess of `C_(6)H_(6)` reacts with `CH_(2)Cl_(2)` in presence of anhydrous `AlCl_(3)`?A. B. C. D. |
| Answer» Correct Answer - D | |
| 191. |
Which of the following groups are `m-`directing :A. `-CHO`B. `-OH`C. `-OCOCH_(3)D. `-COOH` |
| Answer» Correct Answer - A,D | |
| 192. |
Amongst the ions the aromatic specles are :A. B. C. D. |
| Answer» Correct Answer - B::C | |
| 193. |
Which of the following reactions does not yield an amine?A. `R-C-=N+H_(2)Ooverset(H^(+))Rarr`..........B. `R-X+NH_(3)rarr`...............C. `R-CH=NOH+[H]underset(C_(2)H_(5)OH)overset(Na)rarr`...............D. `RCONH_(2)+4[H]overset(LiAIH_(4)rarr`.............. |
| Answer» Correct Answer - A | |
| 194. |
Which of the following does not react with acetyl chloride ?A. `(CH_(3))_(3)N`B. `(CH_(3))_(2)NH`C. `C_(2)H_(5)NH_(2)`D. `C_(2)H_(5)OH` |
| Answer» Correct Answer - A | |
| 195. |
Which of the following will react with water?A. `CHCl_(3)`B. `Cl_(3)C CHO`C. `C Cl_(4)`D. `ClCH_(2)CH_(2)Cl` |
| Answer» Correct Answer - B | |
| 196. |
In a Cannizaro reaction the intermediate that will be the best hydride donor isA. B. C. D. |
| Answer» Correct Answer - C | |
| 197. |
In the reaction: [X] will be :-A. B. C. D. |
| Answer» Correct Answer - D | |
| 198. |
Consider the following reaction. The product (A) isA. B. C. `HO-overset(14)CH_(2)-underset(OCH_(3))underset(|)CH-CH_(2)OCH_(3)`D. `CH_(3)Ooverset(14)CH_(2)-underset(OH)underset(|)CH-CH_(2)OCH_(3)` |
| Answer» Correct Answer - B | |
| 199. |
In the reaction `+Hclrarr` the major product formed isA. B. C. D. |
| Answer» Correct Answer - A | |
| 200. |
Consider the following sequence of rections. The end product (B) isA. B. C. D. |
| Answer» Correct Answer - B | |