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WorksheetsCarbonyl
Total questions: 15
Worksheet time: 8mins
When reacted with a strong reducing agent, aldehydes turn into
carboxylic acids
ketones
primary alcohols
secondary alcohols
When reacted with a strong reducing agent, ketones turn into
carboxylic acids
ketones
primary alcohols
secondary alcohols
An organic compound X has the following chemical properties.
· Forms a yellow precipitate when tested with 2,4-dinitrophenylhydrazine.
· Forms a yellow precipitate when it reacts with an excess iodine in alkaline solution.
Which of the following compounds is X?
Which substance would test positively with 2,4-DNPH but negatively with Tollens’ reagent?
Propanal
Propanone
Propanoic acid
1-propanol
Which reagent would you choose to convert 1-pentanol to pentanal?
PCC in CH2Cl2
K2Cr2O7 with aqueous H2SO4
KMnO4 with aqueous H2SO4
KOH, ethanol, reflux
The only aldehyde that gives positive result with I2/NaOH is
Butanal
2-methylpropanal
Ethanal
Propanal
Tollen's reagent is used to identify the presence of aldehyde by giving the result of
yellow precipitate
silver mirror
cloudy
brown precipitate
Below are the reagents and conditions used for reduction except
i.LiAlH4 ii. H3O+
KMnO4, H+, heat
NaBH4, Methanol
H2, Pt
What is the structural formula when cyclopentanone reacts with KCN, HCl
Carbonyl compounds that give pale yellow precipitate with iodoform test must have contains..
methyl carbinol group
methyl carbonyl group
carboxyl group
carboalkoxy group
The structure of 3-methyl-4-hydroxyhexanal is :
Which structural formula is of 2,4-DNPH, a reagent to confirm the presence of carbonyl group.
A
B
C
D
