30 Questions
Which of the following reactions involves the conversion of a carbonyl group to a imine?
Reductive amination
What is the product of the reduction of ketones by Mg or Mg/Hg?
Vic cis diol
Why are α-hydrogen atoms in carbonyl compounds acidic?
Due to the presence of an electron-withdrawing group
What is the product of the reduction of benzaldehyde by Na/C2H5OH?
Vic cis diol
Why are compounds with active methylene or methyne groups more acidic than simple aldehydes and ketones?
Due to the increased stability of the conjugate base
What is the product formed when acetaldehyde reacts with HCN?
acetaldehyde cyanohydrin
Which reagent is used to form isopropyl alcohol?
CH3MgI
What is the product formed when acetone reacts with NaHSO3?
acetone sulfate
What is the product formed when acetaldehyde reacts with hydroxylamine (NH2OH)?
acetaldehyde oxime
What is the product formed when acetone reacts with PCl5?
isopropylidene chloride
In a nucleophilic addition reaction, what happens when the attacking atom of the nucleophile has a lone pair of electrons in the addition product?
Water is eliminated from the addition product
What is the product formed when a primary amine or a derivative of ammonia reacts with a carbonyl compound?
An imine
Why is glycol often used in a reaction to protect a carbonyl group?
Because it can be easily deprotected by hydrolysis
What is the condition for obtaining high yields of acetals or ketals?
Removal of water as it is formed
What happens to acetals and ketals in the presence of excess water?
They are transformed back to the corresponding aldehyde or ketone
What is the significance of using NaCN in the reaction of aldehydes and ketones with HCN?
To generate hydrogen cyanide in situ during the reaction
Which of the following aldehydes does not give an optically active cyanohydrin?
Formaldehyde
What is the purpose of adding HCl to a mixture of a carbonyl compound and NaCN?
To generate hydrogen cyanide in situ during the reaction
Which of the following compounds can be separated from a mixture using NaHSO3?
Aldehydes and aliphatic methyl ketones
What is the characteristic of the product formed when a carbonyl compound reacts with HCN?
It is a racemic mixture
What is the characteristic of the carbonyl group that makes it polar?
The oxygen atom attains a partial negative charge and the carbon atom attains a partial positive charge
What is the name of the reaction that involves the oxidation of secondary alcohols to ketones by aluminium tert-butoxide?
Oppenauer oxidation
Which of the following reagents is NOT a mild oxidising agent?
Al(−O − C(CH 3 )3 )3
What is the general formula for aldehydes and ketones?
Cn H 2n O
What is the shape of the molecule around the carbonyl carbon atom?
Trigonal planar
What is the characteristic feature of aldol condensation reaction?
Dehydration occurs readily due to the formation of a conjugated system
What is the primary product formed when propanal undergoes crossed aldol condensation with acetone?
CH_3CH(OH)CH(CH_3)CHO
What is the purpose of using Schiff's reagent in a reaction?
To detect the presence of an aldehyde group
What is the primary function of sodium nitroprusside in a reaction?
To detect the presence of an aldehyde group
What is the reaction condition required for the formation of a benzoin condensation product?
Presence of a strong base catalyst
This quiz covers the formation of cyanohydrins through various reactions, including the addition of HCN, NaHSO3, and Grignard reagents, as well as reactions with hydroxylamine, hydrazine, and phenylhydrazine.
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