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Test For Carbonyls

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Total cards: 14•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (14)

#1
Front (Question)

Outline Fehling’s solution test

Back (Answer)

-bright blue and when two parts added and warmed with aldehyde a red precipitate of copper (I) oxide produced, ketone does not react -aldehyde oxidised to carboxylic acid -Cu2+ ions in solution reduced to Cu+

#2
Front (Question)

What is Benedicts solution

Back (Answer)

Similar to fehlings but more stable and less corrosive

#3
Front (Question)

What do tests for aldehydes involve

Back (Answer)

Mild oxidising agents oxidising the aldehyde to carboxylic acid (RCOO-) which is present as a carboxylate ion in the alkaline conditions

#4
Front (Question)

Explain the Tollen’s reagent test

Back (Answer)

Tollen’s agent is amoniacal silver nitrate high when heated with aldehyde produces a silver mirror -silver ions reduced to silver atoms and aldehyde oxidised to carboxylic acid

#5
Front (Question)

Test for all carbonyl compounds and how to find specific ketone or aldehyde

Back (Answer)

Treat with 2,4-dinitrophenylhydrazine (2,4-DNPH) which produces an orange precipitate -this derivative formed has a specific melting point that can be tested and checked using database after product filtered, recrystallised and dried then melting point determined

#6
Front (Question)

Explain the iodoform test and what it tests for

Back (Answer)

Reagent is iodine in potassium hydroxide which when warmed with compound containing CH3CO- group (methyl ketone, methyl group next to carbonyl group) produces yellow precipitate of CHI3 (triiodomethane)

#7
Front (Question)

Overall triiodomethane reaction equation

Back (Answer)

CH3COR + 3I2 + 4NaOH —-> RCOO-Na+ + CHI3 (yellow precip) + NaI + 3H2O

#8
Front (Question)

What are the two steps in the triiodomethane reaction

Back (Answer)

Substitution of three iodine atoms on three hydrogen atoms of methyl group then hydrolysis when carbon carbon bond broken

#9
Front (Question)

Use of triiodomethane reaction

Back (Answer)

Can be used to shorten carbon chain by removing methyl group

#10
Front (Question)

Which aldehyde gives positive result for iodoform test

Back (Answer)

Ethanal

#11
Front (Question)

Does 2,4-DNPH give positive result with carboxylic acids

Back (Answer)

No

#12
Front (Question)

Organic products from reaction between iodine and propanone in alkaline

Back (Answer)

CHI3 and CH3COONa

#13
Front (Question)

Two observations with iodoform

Back (Answer)

Yellow precipitate and antiseptic smell

#14
Front (Question)

What type of alcohols give positive result for iodoform

Back (Answer)

Secondary alcohols with methyl group and ethanol