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.
| 451. |
Acetone on condensation with chloroforms in presence of caustic potash forms :A. chloretoneB. trichloro nitromethaneC. 1,1,1-trichloro-2-methyl propan-2-olD. chloropicrin |
| Answer» Correct Answer - A::C | |
| 452. |
Formaldehyde is used:A. as antiseptic and germicideB. for making synthetic plastics and resinsC. for the preservation of biological specimensD. all of the above |
| Answer» Correct Answer - D | |
| 453. |
When formaldehyde is treated with methanol in presence of dry HCI gas or fused `CaCI_(2)` it, yields:A. acetaldehydeB. mercaptalC. methylalD. dimethyl ether |
| Answer» Correct Answer - C | |
| 454. |
When formaldehyde is treated with ammonia, the compound formed is:A. ureaB. hexamethylene tetramineC. bakeliteD. triethylene tertramine |
| Answer» Correct Answer - B | |
| 455. |
Hydroxyl amine condeness with acetone to yieldA. AcetoxineB. MethanenitrileC. NitromethaneD. Anil. |
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Answer» Correct Answer - A Acetoxime. |
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| 456. |
Compound X undergoes formation of cyanohydrin which on hydrolysis gives lactic acid `(CH_(3)CH(OH)COOH)`. Therefore, compound X isA. FormaldehydeB. AcetaldehydeC. AcetoneD. Benzaldehyde. |
| Answer» Correct Answer - A | |
| 457. |
In the Cannizzaro reaction given below: `2Ph-CHO overset(overset(Θ)OH)rarrPh-CH_(2)OH+PhCO_(2)^(-)` the slowest step is:A. the attack of `OH^(-)` ion on carbonyl groupB. the transfer of `H^(-)` ion to carbonyl groupC. the abstraction of `H^(+)` from the carboxylic acidD. the disproportionation of `PhCH_(2)OH`. |
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Answer» Correct Answer - B The transfer of `H^(-)` ion is involved in the slowest step. |
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| 458. |
Consider the following Cannizzaro reaction `2Ph-CHOoverset(OH^(-))rarrPh-CH_(2)OH+PhCO_(2)^(-)` In the above reaction, the slowest step of the reaction isA. attack of `OH^(-)` at the carbonyl groupB. the transfer of hydride to the carbonyl groupC. the abstraction of proton from the caboxylic acidD. the deprotonation of `Ph-CH_(2)OH` |
| Answer» Correct Answer - B | |
| 459. |
Compound (A) undergoes Cannizzaro reaction and (B) undergeos positive iodoform test. ThereforeA. A=Acetaldehyde , B= 1- PentanalB. `A=C_(6)H_(5)CH_(2)CHO` , B= 2- PentanoneC. A= Formaldehyde , B= 2-PentanoneD. A= Propionaldehyde , B=1- Pentanol |
| Answer» Correct Answer - C | |
| 460. |
Glycol oon intramolecular Cannizzaro reaction in presenncof strong alkali gives:A. glycolB. glycollic acidC. glycineD. glucose |
| Answer» Correct Answer - B | |
| 461. |
The Cannizzaro reaction is not given byA. TrimethylB. AcetaldehydeC. BenzaldehydeD. Formaldehyde. |
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Answer» Correct Answer - B Because it contains `alpha`-H atom. |
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| 462. |
Aldol condensation does not occur betweenA. two different aldehydesB. two different ketonesC. an aldehyde and ketoneD. an aldehyde and ester |
| Answer» Correct Answer - D | |
| 463. |
Write the IUPAC name of the following compound : `H_(3)C-overset(Cl)overset(|)(CH)-CH_(2)-overset(O)overset(||)(C)-CH_(3)` |
| Answer» 4-Chloropentan-2-one | |
| 464. |
Acetoxime on heating in presence of conc. `H_(2)SO_(4)` undergo rerrangement and yields:A. acetone hydrazoneB. acetoneC. acetone semicarbazoneD. N-methyl acetamide |
| Answer» Correct Answer - D | |
| 465. |
Assertion : Fehling reagent is a test for all aliphatic aldehydes. Reason : Aliphatic aldehydes can be easily oxidised even with mild oxidising agents.A. If both assertion and reason are correct and reason is correct explanation for assertion.B. If both assertion and reason are correct and reason is not correct explanation for assertion.C. If assertion is correct but reason is incorrect.D. If assertion as well as reason are both incorrect. |
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Answer» Correct Answer - A Reason is the correct explanation for assertion. |
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| 466. |
Why are lower members of aldehydes easily miscrible with water? |
| Answer» Lower members of aldehydes (contaning upto four carbon atoms) are easily miscible with water due to the presence of intermolecular hydrogen bonding. For details bonding. | |
| 467. |
Acetaldehyde to butan-2-one |
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Answer» Acetaldelhyde to butan-1-one `underset("Acetaldehyde")(CH_(3)CHO)underset(("Aldol Condensation"))overset((NaOH))rarrunderset("Acetaldol")(CH_(3)-underset(OH)underset(|)(C)HCH_(2)CHO)overset(Zn//Hg//HCl)rarrunderset("Butan-2-ol")underset(OH)underset(|)(CH_(3)CHCH_(2)CH_(3))overset(Cu//573K)rarrunderset("Butan-2-one")(CH_(3)COCH_(2)CH_(3))` |
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| 468. |
Acetaldehyde to butan-1,3 diol |
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Answer» Acetaldehyde to butan-1,3-diol `underset("Acetaldehyde")(CH_(3)CHO)overset((NaOH))underset(("Aldol condensation"))rarrunderset("Acetaldol")(CH_(3)underset(OH)underset(|)(C)HCH_(2)CO)overset(LiAlH_(4))rarrunderset("Butane-1,3-diol")(CH_(3)underset(OH)underset(|)(C)HCH_(2)underset(OH)underset(|)(C)H_(2))` |
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| 469. |
Acetone reacrts with butan-2-ol in prsence of aluminium tertiary butoxide to form :A. butanone + propan -1-olB. butanone + propan -2-olC. butanal +propan-1-olD. butanal +propan-2-ol |
| Answer» Correct Answer - B | |
| 470. |
Name the reagents used to convert (i) Primary alcohol to an aldehyde (ii) Butan-2-one to butan-2-ol. |
| Answer» (i) Pyridine chlorochromate (PCC) (ii) `LiAlH_(4)`. | |
| 471. |
Under what circumstances may and aldehyde ber prepared by oxidation of primary alcohol, ROH, with acid dichromate? |
| Answer» If the aldehyde product in more volatile than the reactant alcohol and `H_(2)O`, it may be removed from the reaction mixture by distillation as it is formed. For exapmple, acetaldehyde (b.pt.294K) can be prepared from ethyl alcohol (b.pt. 351K) by this method. | |