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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.
| 101. |
The compound is a condensation product. It is obtained either by treating 3 molecules of acetone with conc. `H_(2)SO_(4)` or passing propyne through a red -hot tube. The product is:A. phoroneB. diacetonyl alcoholC. mesityl oxideD. mesitylene |
| Answer» Correct Answer - D | |
| 102. |
The most reactive compound towards formation of cyanohydrin on treatment with KCN followed by acidification isA. benzaldehydeB. p-nitrobenzaldehydeC. phenyl acetaldehydeD. p-hydroxy benzaldehyde |
| Answer» Correct Answer - B | |
| 103. |
The formation of cyanohydrin from ketone is an example of :A. electrophilic additionB. nucleophilic additionC. nucleophilic substitutionD. none of these. |
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Answer» Correct Answer - B (i) `underset(" 1-Hexyne ")(CH_(3)(CH_(2))_(3)C-=CH)overset(H_(2)O,H_(2)SO_(4))underset(HgSO_(4))rarrunderset("2-Hexanone")(CH_(3)(CH_(2))_(3)-COCH_(3))` (ii) `underset("3-Methyl-2-heptene")(CH_(3)(CH_(2))_(3)overset(CH_(3))overset("| ")"C "=CHCH_(3))overset((i)O_(3))underset((ii)H_(2)O)rarrunderset("2-Hexanone")(CH_(3)(CH_(2))_(3))-COCH_(3)+CH_(3)CO_(2)H` (iii) `underset("2-hexanol")(CH_(3)(CH_(2))_(3)CHOHCH_(3))overset((i)CH_(3)CHO)underset((ii)H_(3)^(+)O)rarrunderset("2-Hexanol")(CH_(3)(CH_(2))_(3)CHOHCH_(3))overset(K_(2)Cr_(2)O_(7))underset(H_(2)SO_(4))rarrunderset("2 Hexanone")(CH_(3)(CH_(2))_(3)COCH_(3))` (iv) `underset("1-Hexyne")(CH_(3)(CH_(2))_(3)C)-=CHoversetoverset("2 Hexanone")("Hydroboration")underset("Oxidation")rarrunderset("1-Hexanol")(CH_(3)(CH_(2))_(3)CH_(2)CHO)` |
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| 104. |
The formation of cyanohydrin from ketone is an example of :A. electrophilic additionB. nucleophilic additionC. nucleophilic substitutionD. electrophilic substitution |
| Answer» Correct Answer - B | |
| 105. |
Give a simple test to distinguish between : (i) Pentan-2-one and Pentan-3-one. , (ii) Benzaldehyde and acetophenone. |
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Answer» (i) Pentan-2-one is methyl ketone, It gives iodoform test (yellow ppt.) Pentan-3-one does not respond to this test since it is not a methyl ketone. (ii) Acetophenone `(C_(6)H_(5)COCH_(3))` being a methyl ketone responds to iodoform test (yellow ppt.).Benzaldehyde `(C_(6)H_(5)CHO)` does not given this test. |
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| 106. |
`C_(6)H_(5)-CH=CHCHO overset((X))rarr C_(6)H_(5)CH=CH_(2)OH` In the above sequence (X) can be:A. `H_(2)//Ni`B. `NaBH_(4)`C. `K_(2)Cr_(2)O_(7)//H^(+)`D. both (A) and (B). |
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Answer» Correct Answer - B `NaBH_(4)` reduces `gt CO` group but does not reduce `gtC=Clt` (ethylenic group). |
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| 107. |
`C_(6)H_(5)-CH=CHCHO overset((X))rarr C_(6)H_(5)=CHCH_(2)OH` In the above sequence (X) can be:A. `H_(2)//Ni`B. `NaBH_(4)`C. `K_(2)Cr_(2)O_(7)//H^(+)`D. Both (a) and(b) |
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Answer» Correct Answer - B `Ph-CH=CH-CHO` `overset(NaBH_(4))rarr Ph-CH=CH-CH_(2)OH` `NaBH_(4)` does reduce `(C=C)` and `(C-=C)` bonds. |
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| 108. |
`"Ethanal"overset(Al(OC_(2)H_(5))_(3))rarrXoverset(C_(2)H_(5)ONa)rarrY` In the above reaction X and Y areA. `CH_(3)COOH,CH_(3)COOC_(2)H_(5)`B. `CH_(3)COOC_(2)H_(5),CH_(3)COCH_(2)COOC_(2)H_(5)`C. `CH_(3)COOH,CH_(3)COCH_(3)`D. None of tha above. |
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Answer» Correct Answer - B `underset("Ethanal")(2CH_(3)CHO)overset(Al(OC_(2)H_(5))_(3))underset("Tischenko reaction")rarrunderset((X))(CH_(3)COOC_(2)H_(5))overset(+C_(2)H_(5)ONa)rarrunderset("Ethyl acetoacetate(Y)")(CH_(3)-overset(O)overset(||)C-CH_(2)-overset(O)overset(||)C-OC_(2)H_(5))` |
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| 109. |
The reaction `R_(2)C="NNH"_(2)overset(C_(2)H_(5)ONa)rarrR_(2)CH_(2)+N_(2)` is calledA. Clemmensen reductionB. Hundicker reactionC. Fischenko reactionD. Wolff Kishner reducion. |
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Answer» Correct Answer - D Due to the presence of `alpha` hydrogen in 2-Methyl propionaldehyde |
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| 110. |
Wolff-Kishner reduction is used for the reduction of :A. nitro compoundB. carboxylic acidsC. carbonyl compoundD. olefins. |
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Answer» Correct Answer - C `NH_(2)-NH_(2)` in the presence of KOH at 437 K reduces C=O to `CH_(2)` |
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| 111. |
Acetaldehyde is converted to ethane by Wolff-Kishner reduction. Acetaldehyde is treated with :A. `LiAIH_(4)`B. `NaBH_(4)`C. `NH_(2) NH_(2) and NaOC_(2)H_(5)`D. `H_(2)` with `Pd//BaSO_(4)` |
| Answer» Correct Answer - C | |
| 112. |
Isopropyl alcohol on oxidation forms :A. acetoneB. etherC. acetaldehydeD. ethylene |
| Answer» Correct Answer - A | |
| 113. |
When vapours of isopropyl alcohol are passed over heated copper, the major product obtained isA. PropaneB. PropyleneC. AcetaldehydeD. Acetone. |
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Answer» Correct Answer - A `CH_(3)-underset(CH_(3))underset("| ")"CH"-OHoverset(Cu)underset("575 K")rarrCH_(3)-overset(O)overset(||)C-CH_(3)+H_(2)` |
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| 114. |
The vapours of ethyl alcohol are passed over red hot copper at 573 K to form:A. MethaneB. FormaldehydeC. AcetoneD. Acetaldehyde. |
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Answer» Correct Answer - D `underset("Ethyl alcohol")(CH_(3)-CH_(2)-OH)overset(Cu//573K)rarrunderset("Acetaldehyde")(H_(3)"CC"HO)` |
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| 115. |
Predict the product of reaction ? `CH_(3)-underset(CH_(3))underset(|)(C) = Ooverset("HCN")rarr?` |
| Answer» `underset("Propane")(CH_(3)-underset(CH_(3))underset(|)(C)=O+H)CNrarrunderset("Propanone cyanohydrin")(CH_(3)-underset(CH_(3))underset(|)overset(OH)overset(|)(C)-CN)` | |
| 116. |
Write a test to differentiate between pentan-2-one and pentan-3-one. |
| Answer» Distinction can be made by iodoform list. It is given by pantan-2-one and not by pantan-3-one. | |
| 117. |
Write the structure of the main products when ethanal `(CH_(3)CHO)` reacts with the following regents : (i) `HCN` , (ii) `NH_(2)-NH_(2)//H^(+)` , (iii) `LiAlH_(4)` |
| Answer» (i) `CH_(3)CH(OH)CN` , (ii) `CH_(3)CH = N.NH_(2)` , (iii) `CH_(3)CH_(2)OH` | |
| 118. |
Propene to propanone |
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Answer» Propene to propanone `underset("Propene")(CH_(3)CH)=CH_(2)overset(H_(2)O //H^(+))rarrunderset("Propan-2-ol")(CH_(3)-underset(OH)underset(|)(C)H-CH_(3))overset(K_(2)Cr_(2)O_(7)//H^(+))rarrunderset("Propanone")(CH_(3)-underset(O)underset(||)(C)-CH_(3))` |
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| 119. |
In acidic medium in presence of conc. `H_(2)SO_(4)` acetaldehyde will give :A. `CH_(3)-overset(OH)overset(|)(CH)-CH_(2)CHO`B. `CH_(3)CH=CH-CHO`C. D. `{:(" "CH_(3) " " H),(" "|" "|),(H-C-O-C-CH_(3)),(" "|" "|),( " "O" "O),(" "|" "|),(CH_(3)-C-O-C-H),(" "|" "|),(" " H" "CH_(3)):}` |
| Answer» Correct Answer - C::D | |
| 120. |
Propanal to butanone |
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Answer» Propanal to butanone `underset("Propanal")(CH_(2)CH_(2)CH)=Ounderset(H_(2)O //H^(+))overset(CH_(3)MgBr)rarrunderset("Butan-1-ol")(CH_(3)CH_(2)underset(OH)underset(|)(C)HCH_(3))overset("Oxidation")rarrunderset("Butanone")(CH_(3)CH_(2)overset(O)overset(||)(C)CH_(3))` |
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| 121. |
How will you convert acetaldehyde into methane? |
| Answer» `underset("Acetadehyde")(CH_(3)CHO)overset(CrO_(3)("oxidation"))rarrunderset("Acetic acid")(CH_(3)COCH)overset(NaOH)rarrunderset("Sod.acetate")(CH_(3)COONa)underset(("Soda lime"))overset(NaOH//CaO)rarrunderset("Methane")(CH_(4))` | |
| 122. |
In the preparation of aldehydes from primary alcohols, adehydes formed must be distilled as soon as they are formed. Why ? |
| Answer» Aldehydes formed as a result of the oxidation of primary alcohols are prone t o further oxidation and are expected to form acids. Therefore, it is advisable to remove them form the reaction mixture by distillation in case these are low boiling. Otherwise other methods must be used to convert primary alcohols into aldehydes. | |
| 123. |
Distinguish between the following : (i) `CH_(3)-CO-CH_(2)CH_(3)` and `CH_(3)-CH_(2)-CH_(2)-CHO` (ii) Ethanal and ethanoic acid. |
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Answer» (i) `CH_(3)-CO-CH_(2)CH_(3)` responds to idoform reaction (gives yellow precipitate) while `CH_(3)-CH_(2)-CH_(2)-CHO` fail to give. (ii) Ethanoic acid gives a brisk effervescence with `NaHCO_(3)` solution while ethanal fail to do so. |
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| 124. |
How will you convert propanone to propene ? |
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Answer» Propaonone to propene `underset("Propanone")(CH_(3)COCH_(3))overset(LiAlH_(4))rarrunderset("Propane-2-ol")(CH_(3)underset(OH)underset(|)(C)HCH_(3))underset("Heat")overset(H_(2)SO_(4)("conc."))rarrunderset("Propene")(CH_(3)CH=CH_(2))` |
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| 125. |
How will you perpare ethlamine from acetaldehyde ? |
| Answer» `underset("Acetaldehyde")(CH_(3)CH)= Ounderset(-H_(2)O)overset(NH_(3))rarrunderset("Acetaldamine")(CH_(3)CH=NH)overset(Ni//H_(2))rarrunderset("Ethylamine")(CH_(3)CH_(2)N H_(2))` | |
| 126. |
Dialkyl cadmium is used to prepare ketones from acid chlorides and not from Grignard reagents. Assign reason. |
| Answer» Grigard reagents do from ketones with acid chlorides but the reactions does not stop at this stage. Ketones further takes part in the reactions with Grignard reagents to give tertiary alcohols. Therefore, dialkyl cadmium is used which reacts with only the acid chlorides and not with ketones. | |
| 127. |
Reduction or ketones can not be carried out with which of the following reagents?A. Hydrogen in presene of palladium in barium sulphateB. Sodium borohydribe or lithium aluminium hydrideC. Zince amalgam and concentrated HCID. Hydrazine and KOH in ethylene glycol |
| Answer» Correct Answer - A | |
| 128. |
Which of the following will distinguish ethanal from benzaldehyde ?A. `[Ag(NH_(3))_(2)]OH`B. 2, 4 DNPC. `CuSO_(4)+NaOH+"sodium potassium tartate"`D. `NaHSO_(3)`. |
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Answer» Correct Answer - C `C_(6)H_(5)CHO` does not reduce Fehling solution while acetaldehyde reduces it. |
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| 129. |
How will you convert ethanol to propanone ? |
| Answer» `underset("Ethanol")(CH_(3)CH_(2)OH)overset((O))rarrunderset("Ethanoic acid")(CH_(3)COCH)overset(Ca(OH)_(2))rarrunderset("Cal.salt")(CH_(3)COO_(2)Ca)overset("heat")rarrunderset("Propanone")(CH_(3)COCH_(3))` | |
| 130. |
Maximum hydration takes place of :A. `CF_(3)overset(O)overset(||)(C)CF_(3)`B. `CH_(3)overset(O)overset(||)(C)CH_(3)`C. `CH_(3)underset(Cl)underset(|)(CH)-overset(O)overset(||)(C)CH_(3)`D. `C_(6)H_(5)overset(O)overset(||)(C)C_(6)H_(5)` |
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Answer» Correct Answer - A (a) Strong-I group , show more hydrate formation . |
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| 131. |
(A) Benzaldehyde is less reactive than acetaldehyde towards nucleophiles. ltBRgt (R) Carbonyl carbon in benzaldehyde has less positive charge than that of carbonyl carbon in acetaldehyde due to resonance.A. Both A and R are ture and R is the correct explanation of A.B. Both A and R are ture but R is not a correct explanation of AC. A is true but R is falseD. A is false but R is true |
| Answer» Correct Answer - A | |
| 132. |
Reduction of ketones canot be carried out with which of the following reagents?A. Hydrogen in the presence of palladiun deposited over barium sulphate in the presence of quinolineB. Sodium borohydride or lithium aluminimum hydrideC. Zinc amalgam and conc. HClD. Hydrazine and KOH in ethylene glycol. |
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Answer» Correct Answer - A It is an example of catalytic hydrogention and is generally quite effective for `gtC=Clt` bond not for carbonyl compound `(gtC = O)` |
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| 133. |
Give a chemical test to distinguish between benzaldehyde and acetone. |
| Answer» Acetone `(CH_(3)COCH_(3))` being a methyl ketone gives a positive iodoform test (forms yellow precipitate) but benzaldehyde does not respond to this test. | |
| 134. |
Rank the following in order of increasing value of the equilibrium constant for hydration , `K_("hyd.")` (smallest value first) . A. `1 lt 2 lt 3`B. `3 lt 1 lt 2`C. `2 lt 1 lt 3`D. `2 lt 3 lt 1` |
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Answer» Correct Answer - B (b) More positive charge on carbon and less steric hindrance and unstable reactant will favour nucleophilic attack . |
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| 135. |
Out of benzaldehyde and propionaldehyde, which is mre reactive towards nucelophilic addition? |
| Answer» Propionadehyde is more reactive than benzaldehyde towards nucleophilic addition. Actually, in benzaldehyde the aldehyic group has -M (mesomeric) effect. As a result the electron density on the carbonyl carbon atom tends to increase and the nucleophile attack is more difficult as compared to propionaldehyde where alkyl group is attached to the aldehydic group. | |
| 136. |
Which of the following products is formed when benzaldehyde is treated with `CH_(3)MgBr` and the addition product so obtained is subjected to acid hydrolysis?A. Secondary alcoholsB. A primary alcoholC. PhenolD. tert-Butyl alcohol. |
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Answer» Correct Answer - A `underset("Benzaldehyde")(C_(6)H_(5)CHO)overset(CH_(3)MgBr)underset(H^(+)//H_(2)O)rarrunderset(2^(@)"Alcohol")(C_(2)H_(5)CH(OH)CH_(3))` |
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| 137. |
Which of the following statements are true about the benzoin reaction ? A. `overset(Θ)(CN)` attacks at the `(C=O)` group of (A).B. `overset(Θ)(CN)` attacks at `(C=O)` group of (B).C. The major product formed is: D. The major product formed is: |
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Answer» Correct Answer - A::C More EDG means more negative charge density on the C of `(C-H)` group and consequentyl more easily the `H^(o+)` ion is lost. Order of EDGs: `Me ("three H.C. structures") gt Et ("two H.C. structures") gt i-Pr ("one H.C. structure") gt Ph ("structure") gt Ph ("standard")` Decreasing order of `H^(Θ)` donor. `underset(("Best"))(b)gt(c )gtunderset(("Least"))((d) gt (a))` |
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| 138. |
Which of tho the following does not undergo benzoin condensation ?A. `C_(6)H_(5)CHO`B. C. D. `C_(6)H_(5)CH_(2)CHO` |
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Answer» Correct Answer - D Benzoin condensation is given by aromatic aldehydes only where CHO group is directly attached to the ring. |
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| 139. |
The product of the reaction is :A. B. C. D. |
| Answer» Correct Answer - C | |
| 140. |
Reaction by which bezaldehyde can not be prepared :A. B. C. D. |
| Answer» Correct Answer - D | |
| 141. |
The smallest ketone and its next homologue are reacted with `NH_(2) OH` to from oximeA. two different oximes are formedB. three different oximes are formedC. two oximes are optically activeD. all oximes are optically active |
| Answer» Correct Answer - B | |
| 142. |
, The above ketone will not be formed by :A. treatment of acetyl chloride with dibenzyl cadmiumB. reaction of benzene and acetyl chloride in presence `AlCl_(3)`C. reaction of acetonitrile with phenyl magnesium bromide in ether followed by hydrolysisD. addition of water to phenyl acetylene in the presence of `HgSO_(4)` and dil. `H_(2)SO_(4)` |
| Answer» Correct Answer - A | |
| 143. |
Which of the following will undergo aldol condensation?A. `CH_(2) = CHCHO`B. `CH -= C CHO`C. `C_(6)H_(5)CHO`D. `CH_(3)CH_(2)CHO ?` |
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Answer» Correct Answer - D Only `CH_(3)CH_(2)CHO` undergoes alodl condensation Compound (a) has also `alpha`-hydrogen but is not abstracted by base since it is attached to double bonded carbon atom. |
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| 144. |
When benzaldehyde is heated with acetic anhybride in the presence of sodium, the products, obtained is :A. cinnamic acidB. phenyl acetic acidC. benzoic acidD. benzoic anhydride |
| Answer» Correct Answer - A | |
| 145. |
In the following species, the one which is likely to be intermediate during benzoin condensation of benzaldehyde, isA. `Ph-C-=overset(o+)O`B. C. D. `Ph-overset(Theta)=O` |
| Answer» Correct Answer - B | |
| 146. |
Ketones `(R_(1)COR_(2)):R_(1)=R_(2)`=alkyl group, can be obtained in one step byA. Hydrolysis of estersB. Oxidation of primary alcoholsC. Oxidation of secondary alcoholsD. Reaction of acid halides and alcohols. |
| Answer» Correct Answer - B | |
| 147. |
When acetone reacts with trichloromethane in the presence of KOH, the product formed isA. ChloropicrinB. ChloretoneC. `"CCl"_(4)`D. Trichlorocacetone. |
| Answer» Correct Answer - B | |
| 148. |
Which type of isomerism is shown by pentaone?A. Chain isomerismB. Position isomerismC. Functional isomerismD. All of these |
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Answer» Correct Answer - D All types listed are shown by pentanone. |
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| 149. |
Which of the folloiwng reagents will not react with ethanal ?A. HClB. `Cl_(2)`C. `PCl_(5)`D. aq. `NaHSO_(3)`. |
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Answer» Correct Answer - A HCl. |
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| 150. |
Concentrated sodium hydroxide and Benzaldehyde react to produceA. Benzyl alcoholB. HydrobenzamideC. Cinnamic acidD. Benzophenone. |
| Answer» Correct Answer - D | |