Single Choice

The aldol condensation of acetaldehyde results in the formation of:

A$$C{ H }_{ 3 }C{ H }_{ 2 }OH+C{ H }_{ 3 }COOH$$
B$$C{ H }_{ 3 }C{ H }_{ 2 }-CH(OH)-CHO$$
C$$C{ H }_{ 3 }CO- CH(OH) -C{ H }_{ 3 } - CHO$$
D$$CH_3-CH(OH)-CH_2-CHO$$
Correct Answer

Solution

The Aldol addition reaction involves the addition of alpha-carbon of an enolizable aldehyde or ketone to the carbonyl group of another aldehyde or ketone and thus by giving a beta-hydroxy carbonyl compound also known as an aldol (indicating both aldehyde and alcohol groups). The reaction is catalyzed more commonly by a base or sometimes by an acid.

If the beta-hydroxy carbonyl compound containing a $$\alpha$$-hydrogen undergoes subsequent dehydration to yield an alpha, beta-unsaturated carbonyl compound, the entire process is also called as Aldol condensation. The dehydration step is possible under the aldol reaction conditions or mostly carried out by heating in presence of an acid or sometimes during acidic work up.

SIMILAR QUESTIONS

Physical World

$$CH_{3}-CHO\overset{OH^{-}}{\longrightarrow}A$$ The IUPAC name of $$A$$ is:

Physical World

Acetaldehyde undergoes reaction in the presence of dil. NaOH to give

Physical World

Write the equation of chemical reaction and name of reaction obtained fromfollowing compounds $$(A)$$ and $$(B)$$ from $$CH_{3}CHO$$? (A) $$But-2-enal$$ (B) $$Chloroform$$

Physical World

In the reaction sequence, the product $$B$$ is: $$2CH_3CHO\overset{OH^-}{\longrightarrow} A \overset{\Delta}{\longrightarrow}B$$

Physical World

Of the following, which is the product formed when cyclohexanone undergoes aldol condensation followed by heating?

Physical World

Aldol condensation product of acetone on dehydration gives

Physical World

Which of the following compound will undergo self aldol condensation in the presence of cold dilute alkali?

Physical World

Give the aldol condensation product of the image.

Physical World

Compound (A) $$(C_6H_{12}O_2)$$ on reduction with $$LiAIH_4$$ yielded two compounds (B) and (C). The compound (B) on oxidation gave (D), which on treatment with aqueous alkali and subsequent heating furnished (E). The latter on catalytic hydrogenation gave (C). The compound (D) was oxidised further to give (F) which was found to be a monobasic acid (molecular formula weight = 60.0). Deduce the structures of (A), (B), (C), (D), and (E).

Physical World

How will you convert ethanal into the following compounds? But-2-enal

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