Brick red precipitates are formed when aldehydes react with:
Correct answer: D. Fehling's solution
- A. Sodium borohydride
- B. Sodium bisulphite
- C. Sodium nitroprusside
- D. Fehling's solution
Explanation
A is incorrect as sodium borohydrides converts carbonyl compounds to B is incorrect as sodium bisulphate reacts with carbonyl compounds to give white precipitate,rather than red precipitate.C is incorrect as sodium nitropresside test is done to test the presence of ketones.D is correct as Fehling Solutions produce brick red precipitate when reacted with carbonyl compounds.The red colour is an indication of cuprous oxide.
This question appeared on the UHS MDCAT 2010 paper, which you can sit online with every answer explained.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Reactivity of Aldehydes and Ketones
The polar carbonyl group makes aldehydes and ketones undergo nucleophilic addition, reduction and condensation reactions. Aldehydes are generally more reactive and oxidise readily to carboxylic acids, whereas ketones resist mild oxidation; reactions with hydrogen cyanide, sodium bisulfite and 2,4-DNP help identify their behaviour.
Practise Aldehydes and Ketones
679 free Aldehydes and Ketones MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Reactivity of Aldehydes and Ketones questions
Which of the following compounds will react with Tollen's Reagent?
When acetone is heated in the presence of K2Cr2O7/H2SO4, the products formed are:
Aldole consist of which functional group?
Iodoform test will not be positive with:
In the following structure, which one is an α-carbon atom?
It is the general formula of: