मराठी
कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

Describe the following: Cross aldol condensation - Chemistry

Advertisements
Advertisements

प्रश्न

Describe the following:

Cross aldol condensation

रासायनिक समीकरणे/रचना
लघु उत्तर

उत्तर

When aldol condensation is carried out between two different aldehydes and/or ketones, it is called cross aldol condensation. If both of them contain a-hydrogen atoms, it gives a mixture of four products. This is illustrated below by the aldol reaction of a mixture of ethanal and propanal.

Ketones can also be used as one component in the cross-aldol reactions.

shaalaa.com
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 12: Aldehydes, Ketones and Carboxylic Acids - Exercises [पृष्ठ ३७८]

APPEARS IN

एनसीईआरटी Chemistry [English] Class 12
पाठ 12 Aldehydes, Ketones and Carboxylic Acids
Exercises | Q 16.3 | पृष्ठ ३७८

संबंधित प्रश्‍न

A compound 'A' of molecular formula C2H3OCl undergoes a series of reactions as shown below. Write the structures of A, B, C and D in the following reactions :


Write the products formed when CH3CHO reacts with the following reagents: CH3CHO in the presence of dilute NaOH


How will you bring about the following conversion?

Ethanal to but-2-enal


How will you convert ethanal into the following compound?

Butane-1, 3-diol


How will you convert ethanal into the following compound?

But-2-enal


How will you bring about the following conversion in not more than two steps?

Ethanol to 3-Hydroxybutanal


 Why is alpha (α) hydrogen of carbonyl compounds acidic in nature?


Write chemical equations of the following reaction : 

Propanone is treated with dilute Ba (OH)2-.


What is substituted imine called?


Cannizaro’s reaction is not given by ______.


Which of the following conversions can be carried out by Clemmensen Reduction?

(i) Benzaldehyde into benzyl alcohol

(ii) Cyclohexanone into cyclohexane

(iii) Benzoyl chloride into benzaldehyde

(iv) Benzophenone into diphenyl methane


Why is there a large difference in the boiling points of butanal and butan-1-ol?


What product will be formed on reaction of propanal with 2-methylpropanal in the presence of \[\ce{NaOH}\]? What products will be formed? Write the name of the reaction also.


Why are carboxylic acids more acidic than alcohols or phenols although all of them have hydrogen atom attached to a oxygen atom \[\ce{(-O-H)}\]?


\[\ce{CH3-CH2-CHO ->[dil][alkali] Product}\]

The product in the above reaction is:


The major product of the following reaction is:


Which of the following compounds will undergo self-condensation in the presence of dilute NaOH solution?


Identify A and B:


Write a note on the aldol condensation reaction of acetaldehyde.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×