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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. |
When an aldehyde with no `alpha`-hydrogen react with concentrated aqueous NaOH, half the aldehyde is converted ot carboxylic acid salt and other half is converted to an alcoho. In other words, half the reaction is oxidized and other half is reduced. This reaction is known as Cannizzaro reaction Find out the products of following reaction : X and Y are :A. `Ph-overset(O)overset(||)C-overset(Ө)O` and `CH_(3)OH`B. `Ph-CH_(2)OH` and `H-overset(O)overset(||)C-overset(Ө)O`C. `Ph-CH_(2)OH` and `CH_(3)OH`D. `Ph-overset(O)overset(||)C-overset(Ө)O` and `H-overset(O)overset(||)C-overset(Ө)O` |
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Answer» Correct Answer - B |
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| 152. |
Which reagent is useful for protecting an aldehyde functional group in synthesis involving strong bases and nucleophiles ?A. `NH_(3)`B. `B_(2)H_(6)`C. HCND. `HOCH_(2) CH_(2)OH` |
| Answer» Correct Answer - 4 | |
| 153. |
Acetaldehyde and Acetone on reaction with chlorine respectively givesA. Mono chloro acetone, methaneB. Chloral and Dichloro acetoneC. Chloral and Tri chloro acetoneD. Tetra chloro Ethanal, Hexa chloro acetone |
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Answer» Correct Answer - 3 `alpha` - halogenation |
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| 154. |
The correct statement about the synthesis of erythritol `(C(CH_(2)OH)_(4))` used in the preparation of PETN isA. The synthesis requires two aldol condensation and two cannizzaro reactionsB. Alpha hydrogens of ethanol and methanol are involved in this reactionC. The synthesis requires four aldol condensations between methanol and ethanolD. The synthesis requires aldol condensation and one cannizzaro reaction. |
| Answer» Correct Answer - D | |
| 155. |
The reagent that gives an orange coloured precipitate with acetaldehyde isA. `NH_(2)OH`B. `NaHSO_(3)`C. IodineD. 2,4-DNP |
| Answer» Correct Answer - 4 | |
| 156. |
Stephens reaction is used in the preparation ofA. Carboxylic acidsB. KetonesC. AlcoholsD. Aldehydes |
| Answer» Correct Answer - 4 | |
| 157. |
Which of the following is not a monovalent functional group.A. AldehydicB. KetonicC. CarboxylicD. Hydroxy |
| Answer» Correct Answer - 2 | |
| 158. |
The commonly observed ratelaw of Benzoin condensation is rate = `K[ArCHO]^(x)[CN^(-)]^(y)` Then the value of x+y is |
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Answer» Correct Answer - 3 `x = 2` and `y = 1` |
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| 159. |
In the following reaction sequence, the correct stracture of X, Y and Z are : `H-C-=C-COOHoverset(HgSO_(4)//H_(2)SO_(4)//H_(2)O)underset((1))to (X) overset("Heating")underset((2))to(Y) overset(I_(2)//NaOH)to (Z)+CHI_(3)`A. B. `{:(H_(2)=CH-COOH" ",CH_(3)-underset(OH)underset(|)(CH)-COOH" ",underset(COONa)underset(|)(COONa)):}`C. `{:(CH_(3)=underset(O)underset(||)(C)-COOH" ", CH_(3)=CH-O" ", HCOONa):}`D. `{:(O-CH-CH_(2)-COOH" ",CH_(3)-CH=O" ",HCOONa):}` |
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Answer» Correct Answer - D `X=H-overset(O)overset(||)(C)-CH_(2)-overset(O)overset(||)(C)-OH ` , Y=H-overset(O)overset(||)(C)-CH_(3) Z=HCOONa` (`beta-` keto carbozylic acid under go decarboxylation on heating Followed by Iodoform reaction) |
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| 160. |
P is an alcohol which on heating with ` Al_(2)O_(3)` forms an alkene Q. Q on ozonolysis produces R and S. when the mixture of R and S is heated with conc. `NaOH`, redox reaction takes place and a mixture of an acid salt and alcohol is formed. the alcohol (P) is obtained byA. `H_(3)C-underset(O)underset(||)(C)-CH_(2)-CH_(3)+CH_(3)MgBr`B. `CH_(3)-overset(CH_(3))overset(|)(CH)-CH_(2)-CH=O+CH_(3)MgBr`C. `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH_(2)-COCl+MgCl`D. `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH=CH_(2)` |
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Answer» Correct Answer - D `P=CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH_(2)-COCl+CH_(3)MgCl` `,Q= CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH=CH_(2) , " " R&S=CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH=O,O+CH_(2)=O` |
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| 161. |
P is an alcohol which on heating with ` Al_(2)O_(3)_(3)` forms an alkene Q. Q on ozonolysis produces R and S. when the mixture of R and S is heated with conc. `NaOH`, redox reaction takes place and a mixture of an acid salt and alcohol is formed. The compound R and S areA. `CH_(3)-overset(CH_(3))overset(|)(C)=O,CH_(2)=O`B. `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)=CH=O,CH_(3)CH=O`C. `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH=O +CH_(2)=O`D. `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH=O +CH_(2)=O` |
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Answer» Correct Answer - C `P=CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH_(2)-COCl+CH_(3)MgCl` `,Q= CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH=CH_(2) , " " R&S=CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH=O,O+CH_(2)=O` |
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| 162. |
P is an alcohol which on heating with ` Al_(2)O_(3)_(3)` forms an alkene Q. Q on ozonolysis produces R and S. when the mixture of R and S is heated with conc. `NaOH`, redox reaction takes place and a mixture of an acid salt and alcohol is formed. The compound (Q) isA. `CH_(3)-overset(CH_(3))overset(|)(C)=CH_(3)`B. `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH=CH-CH_(3)`C. `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH_(2)-CH=CH_(2)`D. `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH=CH_(2)` |
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Answer» Correct Answer - D `P=CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH_(2)-COCl+CH_(3)MgCl` `,Q= CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH=CH_(2) , " " R&S=CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH=O,O+CH_(2)=O` |
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| 163. |
Isopropyl alcohol on oxidation forms :A. AcetaldehydeB. EthyleneC. EtherD. Acetone |
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Answer» Correct Answer - 4 `CH_(3).CH(OH).CH_(3)+[O]overset(PC C)rightarrow CH_(3)CH_(3)+H_(2)O` |
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| 164. |
Compound having `-overset(O)overset(||)C-CH_(3)` group reacts rapidly with halogen in presence of a base to form haloform . The reaction is known as haloform. `R-overset(O)overset(||)C-CH_(3)overset(X_(2)+overset(Ө)OH)rarrR-overset(O)overset(||)C-overset(Ө)O+CHX_(3)` Mechanism : Which of the following is correct comparison of rate of haloform reaction with various haloform reaction with various halogens ?A. `r_(Cl_(2)) gt r_(Br_(2)) gt r_(I_(2))`B. `r_(I_(2)) gt r_(Br_(2)) gt r_(Cl_(2))`C. `r_(Cl_(2)) = r_(Br_(2)) = r_(I_(2))`D. `r_(Br_(2)) gt r_(Cl_(2)) gt r_(I_(2))` |
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Answer» Correct Answer - C |
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| 165. |
Compound having `-overset(O)overset(||)C-CH_(3)` group reacts rapidly with halogen in presence of a base to form haloform . The reaction is known as haloform. `R-overset(O)overset(||)C-CH_(3)overset(X_(2)+overset(Ө)OH)rarrR-overset(O)overset(||)C-overset(Ө)O+CHX_(3)` Mechanism : Consider the following reactions : Reaction I `rarr Ph-overset(O)overset(||)C-CH_(3)overset(Cl_(2),overset(Ө)OH)rarr Ph-overset(O)overset(||)C-overset(Ө)O+CHCl_(3)` Reaction II `rarr Ph-overset(O)overset(||)C-CD_(3)overset(Cl_(2)overset(Ө)OH)rarr,Ph-overset(O)overset(||)C-overset(Ө)O+CDCl_(3)` Which of the following is correct comparison of the rate of reaction I and II ?A. `r_(I) gt r_(II)`B. `r_(I) lt r_(II)`C. `r_(I)=r_(II)`D. Cannot be detemined |
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Answer» Correct Answer - A |
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| 166. |
`(CH_(3))_(2)COoverset(NaCl)underset((HCl))rarrAoverset(H_(3)O^(+))rarrB` In the above sequence of reaction A and B areA. `(CH_(3))_(2)C(OH)CN, (CH_(3))_(2)C(OH)COOH`B. `(CH_(3))_(2)C(OH)CN, (CH_(3))_(2)C(OH)_(2)`C. `(CH_(3))_(2)C(OH)CN, (CH_(3))_(2)CHOOH`D. `(CH_(3))_(2)C(OH)CN, (CH_(3))_(2)C=O` |
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Answer» Correct Answer - 1 `(CH_(3))_(2)overset(O)overset(||)Coverset(NaCN)underset(Hcl)to(CH_(3))_(2)-overset(OH)overset(||)underset(A)(C)-CNoverset(H_(3)O)to(CH_(3))_(2)-overset(OH)overset(|)underset(B)(C)-CO_(2)H` |
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| 167. |
A mixture of benzaldehyde and formaldehyde on heating with aqueous NaOH solution givesA. Sodium benzoate and methyl alcoholB. sodium benzoate and ethyl alcoholC. benzyl alcohol and methyl alcoholD. benzyl alcohol and sodium formate |
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Answer» Correct Answer - 4 Crossed cannizzaro reaction |
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| 168. |
Which statement about the aldol condensation is correct ?A. A Lewis acid commonly ysed as a catalystB. The initial step is probably the formation of a carbanionC. A Lewis base is employed toinduce carbocation formationD. The carbon chain is lengthened through the elimination of 1 mole of water |
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Answer» Correct Answer - 2 Enolate ion formed is first step. |
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| 169. |
Base catalysed aldol condensation occurs withA. PropanalB. BenzaldehydeC. 2- MethylpropanalD. 2,2- dimethylpropanal |
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Answer» Correct Answer - (A,C) Ph -CHO & 2,2 - -dimethyl propanal have no `alpha-Hbecause` No aldol |
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| 170. |
Which of the give N-subsituted amide from ketoxine ?A. `PCl_(5)`B. `SO_(3)`C. `BF_(3)`D. `overset(..)NH_(3)` |
| Answer» Correct Answer - A::B::C | |
| 171. |
Vinyl alcohol gets converted into acetaldehyde byA. oxidationB. reductionC. rearrangementD. polymerization |
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Answer» Correct Answer - 3 `underset ("vinyl alcohol")(CH_(2)=overset(OH)overset(|)(C)-Hoverset("rearrangement")rArrCH_(3)-overset(O)overset(||)(C)-H underset("acetaldehyde")` |
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| 172. |
`H-overset(O)overset(||)C-OH` and `H_(3)C-overset(O)overset(||)C-OH` can be distinguished by :A. `NaHCO_(3)`B. `H_(2)SO_(4)`C. `AgNO_(3)//NH_(4)OH`D. Fehling solution |
| Answer» Correct Answer - C::D | |
| 173. |
Acctaldehyde can be obtained from which of the following rections ?A. `CH_(3)CH_(2)OHoverset(Cu//Delta)rarr`B. `CH_(3)-overset(O)overset(||)C-Clunderset(H_(2),Delta)overset(Pd-BaSO_(4))rarr`C. `(CH_(3)COO)_(2)Ca+(HCOO)_(2)Caoverset(Delta)rarr`D. `H_(3)C-CH=underset(CH_(3))underset(|)C-Phunderset(Zn-H_(2)O)overset(O_(3))rarr` |
| Answer» Correct Answer - A::B::C::D | |
| 174. |
Which of the following donot give Cannizzaro reaction ?A. `Cl_(3)C-overset(O)overset(||)C-H`B. `H-underset(O)underset(||)C-H`C. `Ph-underset(O)underset(||)C-H`D. |
| Answer» Correct Answer - A::D | |
| 175. |
Which of the donot react with fehling solution ?A. `CH_(3)CHO`B. `Ph-CHO`C. GlucoseD. |
| Answer» Correct Answer - B::D | |
| 176. |
The compound that gives a lactone on heating isA. pentanedioic acid B. 4-hydroxypentanoic acidC. 4-aminopentanoic acidD. 2-hydroxypentanoic acid |
| Answer» Correct Answer - B | |
| 177. |
When salicyl aldehyde is treated with `(CH_(3)CO)_(2)O` in presence of `CH_(3)COO^(Ө)Na^(o+), Delta`A. B. C. D. This reaction is Perkin condensation |
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Answer» Correct Answer - B::C::D |
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| 178. |
The compound that gives a lactone on heating isA. pentanedioic acidB. 4-hydroxypentanoic acidC. 4-aminopentanoic acidD. 2-hydroxypentanoic acid |
| Answer» Correct Answer - B | |
| 179. |
The electrolysis of the disodium salt of pentanedioc acid givesA. pentaneB. butaneC. CyclopropaneD. ethane |
| Answer» Correct Answer - C | |
| 180. |
Identify the compounds that give aromatic salt on reaction with `HCIO_(4)` :A. B. C. D. |
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Answer» Correct Answer - B::C |
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| 181. |
Cannizzaro reaction is example of:A. redox reactionB. disproportionaltionC. both (A) and (B)D. only oxidation |
| Answer» Correct Answer - C | |
| 182. |
The reaction in which `KCN//C_(2)H_(5)OH` is used is :A. Perkin reactionB. Benzoin condensationC. Reimer- Tiemann reactionD. Rosemunds reduction |
| Answer» Correct Answer - B | |
| 183. |
Which of the following are correct for reaction A. B. C. D. |
| Answer» Correct Answer - A::B::D | |
| 184. |
`C_(6)H_(5)-underset(C_(2)H_(5))underset(|)overset(OH)overset(|)C-CH_(3)` Can be prepared fromA. `C_(6)H_(5)COCH_(3)` and `C_(2)H_(5)MgBr`B. `CH_(3)CH_(2)COCH_(3)` and `C_(6)H_(5)MgBr`C. `C_(6)H_(5)COC_(2)H_(5)` and `CH_(3)MgBr`D. all of these |
| Answer» Correct Answer - 4 | |
| 185. |
Which of the following will be products of following reaction ? A. B. C. D. |
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Answer» Correct Answer - A::D It is a protection of carbonyl group. |
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| 186. |
The synthesis of `Ph-underset(C_(2)H_(5))underset(|)overset(CH_(3))overset(|)C-OH` can be achieved by :A. `PhMgBr+Ch_(3)-overset(O)overset(||)C-C_(2)H_(5) overset(H^(o+)//H_(2)O)rarr`B. `C_(2)H_(5)MgBr+Ph-overset(O)overset(||)C-CH_(3)overset(H^(o+)//H_(2)O)rarr`C. `CH_(3)MgBr+CH_(3)+Ph-overset(O)overset(||)C-CH_(2)CH_(3)overset(H^(o+)//H_(2)O)rarr`D. `PhMgBr+CH_(3)-overset(O)overset(||)C-Cloverset(H^(o+)//H_(2)O)rarr` |
| Answer» Correct Answer - A::B::C | |
| 187. |
Which compound (s) on reaction with `overset(Theta)(OH)` can give two organic products (excluding stereoisomers)?A. `CH_(3)CHO`B. `HCHO`C. `CH_(3)-COOEt`D. `C Cl_(3)-CHO` |
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Answer» Correct Answer - (B,C,D) A) `CH_(3)CHOoverset(Theta)overset(OH)toCH_(3)-underset(OH)underset(|)CH-CH_(2)-CHO` B) `HCHOoverset(Theta)overset(OH)to HCOONa+CH_(3)OH` C)`CH_(3)COOEt overset(Theta)overset(OH)to COONa+EtOH` D) `C Cl_(3)-CHOoverset(Theta)overset(OH)toCHCl_(3)+HCOONa` |
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| 188. |
Aldehyde, ketone, carboxylic acid derivatives contain C= O group. Aldehyde and ketones give nucleophilic addition reactions where as acid and acid derivatives give nucleophilic addition followed by elimination reactions. Nucleophilic addition reactions followed by elimination of acid dervatives is Known sacyl substitution reaction. This substitution reaction takes place by formation of tetrahedral intermediate. For the given reaction which of these is correct ?A. L must be better leaving group than NuB. `Nu^(-)` must be strong enough nucleophile to attack carbonyl carbonC. Carbonyl carbon must be enough electrophilic to react with `Nu^(-)`D. all of these |
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Answer» Correct Answer - (D) Self explanotory |
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| 189. |
Which of the following reagents is suitable for above conversion ?A. Zn-Hg/HClB. `LiAIH_(4)`C. `H_(2)N-MH_(2)//Ooverset(Ө)H`D. `NaBH_(4)` |
| Answer» Correct Answer - C | |
| 190. |
The suitable reactant is :A. B. C. D. |
| Answer» Correct Answer - B | |
| 191. |
Selectt the correct combination :A. `H_(3)C-overset(O)overset(||)(C)-H overset(overset(Theta)(O)H)underset(Delta)toH_(3)C-CH=CH-overset(O)overset(||)(C)-H`B. `Ph-overset(O)overset(||)C-Hoverset(KOH)rarrPh-overset(O)overset(||)C-overset(Ө)OK^(O+)+Ph-CH_(2)-OH`C. `Ph-overset(O)overset(||)-Hoverset(Al(OEt)_(3))rarrPh-overset(O)overset(||)C-O-CH_(2)-Ph`D. `Hoverset(O)overset(||)C-Hoverset(NaOH)rarrH-overset(O)overset(||)C-OH+CH_(3)OH` |
| Answer» Correct Answer - A::B::C | |
| 192. |
Select the reactions involved in the reaction above reaction :A. Michael AdditionB. Aldol CondensationC. DehydrationD. Perkin Condensation |
| Answer» Correct Answer - A::B::C | |
| 193. |
Which of the following reagents can perform this conversion successfully ?A. B. `Zn-Hg//HCI`C. `Mg.THF//S_(2)O`D. `N_(2)H_(4)//overset(Ө)OH` |
| Answer» Correct Answer - A::B::D | |
| 194. |
In the following reaction the major product formed is : A. B. C. D. |
| Answer» Correct Answer - B | |
| 195. |
The major product obtained from photochemical chlorination of ethylbenzene (in excess) is hydrolyzed with aqueous KOH. The final product formed is :A. `PbCH_(2)CHO`B. `PhCOCH_(3)`C. `PhCHO`D. PhCOOH |
| Answer» Correct Answer - B | |
| 196. |
Which of the following reagents may be used to accccomplish the conversion? `C_(6)H_(5)H=CH-CH_(2)OH rarr C_(6)H_(5)CH=CHCHO`A. B. C. `MnO_(2)`D. All of these |
| Answer» Correct Answer - D | |
| 197. |
Consider the following reactions and identify how many would give aldol condensation reaction ? |
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Answer» Correct Answer - 4 |
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| 198. |
Which one of the following undergoes reaction with `50%` sodium hydroxide solution to give the corresponding alcohol and acid?A. phenolB. BenzaldehydeC. ButanolD. Benzoic acid |
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Answer» Correct Answer - 2 Benzaldehyde can undergo canizzaro reaction due to absence of `alpha` - Hydrogen. |
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| 199. |
Which of the following is in capable to whow idoform test ?A. B. `Ph-CH=CH-overset(OH)overset(|)CH-CH_(3)`C. D. |
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Answer» Correct Answer - C `3^(@)` alcohol cannot be oxidisized . |
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| 200. |
Which of the following undergoes cannizaro reaction ? A)HCHO B) ` C_(6)H_(5)CHO` C) `Cl_(3)C-CHO` D) ` (CH_(3))_(3)C-CHO`A. Only A & BB. Only B & CC. Only C & DD. Only A,B & D |
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Answer» Correct Answer - 4 Aldehydes containing `alpha` - hydrogen undergo reaction except `C Cl_(3)CHO` and `(C_(6)H_(5))_(3)CH` |
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