Home
Class 12
CHEMISTRY
Which undergoes aldol condensation in th...

Which undergoes aldol condensation in the presence of dilute NaOH?

A

Salicylaldehyde

B

Benzophenone

C

Benzaldehyde

D

Acetaldehyde and formaldehyde mixture.

Text Solution

AI Generated Solution

The correct Answer is:
To determine which compound undergoes aldol condensation in the presence of dilute NaOH, we need to identify the presence of alpha hydrogen in each compound. Here’s a step-by-step solution: ### Step 1: Understand the Requirements for Aldol Condensation Aldol condensation requires the presence of alpha hydrogen atoms adjacent to the carbonyl group (C=O). If a compound has alpha hydrogen, it can participate in the aldol reaction. **Hint:** Look for hydrogen atoms attached to the carbon next to the carbonyl carbon. ### Step 2: Analyze Each Compound 1. **Salicylaldehyde:** - Structure: Contains a benzene ring with a -CHO group and -OH group in ortho position. - Check for alpha hydrogen: The carbon adjacent to the carbonyl carbon has no hydrogen atoms (it is fully substituted). - Conclusion: **No alpha hydrogen present. Cannot undergo aldol condensation.** **Hint:** Examine the carbon next to the carbonyl; if it has no hydrogen, it can't participate. 2. **Benzophenone:** - Structure: Contains two benzene rings with a ketone (C=O) group. - Check for alpha hydrogen: The carbon adjacent to the carbonyl carbon also has no hydrogen atoms (it is fully substituted). - Conclusion: **No alpha hydrogen present. Cannot undergo aldol condensation.** **Hint:** Remember that both sides of the carbonyl must be checked for hydrogen presence. 3. **Benzaldehyde:** - Structure: Contains a benzene ring with a -CHO group. - Check for alpha hydrogen: The carbon adjacent to the carbonyl carbon has no hydrogen atoms. - Conclusion: **No alpha hydrogen present. Cannot undergo aldol condensation.** **Hint:** Similar to the previous compounds, check the adjacent carbon for hydrogen. 4. **Aldehyde Mixture (Acetaldehyde and Formaldehyde):** - Structures: Acetaldehyde (CH3CHO) has three alpha hydrogens, and formaldehyde (HCHO) has none. - Check for alpha hydrogen: Acetaldehyde has alpha hydrogens, while formaldehyde does not affect the aldol reaction. - Conclusion: **Alpha hydrogen present in acetaldehyde. Can undergo aldol condensation.** **Hint:** Look for the total number of alpha hydrogens in the mixture; only one compound needs to have them. ### Step 3: Final Conclusion The only compound that can undergo aldol condensation in the presence of dilute NaOH is the mixture of acetaldehyde and formaldehyde (option D). **Final Answer:** **D (Aldehyde mixture of acetaldehyde and formaldehyde) undergoes aldol condensation.**
To determine which compound undergoes aldol condensation in the presence of dilute NaOH, we need to identify the presence of alpha hydrogen in each compound. Here’s a step-by-step solution: ### Step 1: Understand the Requirements for Aldol Condensation Aldol condensation requires the presence of alpha hydrogen atoms adjacent to the carbonyl group (C=O). If a compound has alpha hydrogen, it can participate in the aldol reaction. **Hint:** Look for hydrogen atoms attached to the carbon next to the carbonyl carbon. ### Step 2: Analyze Each Compound ...
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • ALDEHYDES AND KETONES

    DINESH PUBLICATION|Exercise Comprehension I|3 Videos

  • ALDEHYDES AND KETONES

    DINESH PUBLICATION|Exercise Comprehension 2|1 Videos

  • ALDEHYDES AND KETONES

    DINESH PUBLICATION|Exercise Multiple Choice|60 Videos

  • ALCOHOLS AND PHENOLS

    DINESH PUBLICATION|Exercise Matrix|9 Videos

  • ALKALI EARTH METALS

    DINESH PUBLICATION|Exercise Unit test-12|5 Videos

Similar Questions

Explore conceptually related problems

Assertion : Acetaldehyde undergoes aldol condensation with dil. NaOH. Reason Aldehydes which donot contain a-hydrogen undergo aldol condensation.

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

Knowledge Check

  • In aldol condensation

    A
    `alpha`- hydrogen attacks on carbonyl carbon
    B
    `alpha-` carbon attacks on carbonyl carbon
    C
    `beta-`carbon attacks onn carbonyl carbon
    D
    `beta-`hydrogen attacks on carbonyl carbon

  • Aldol condensation is:

    A
    self condensation of aldehydes only having altleast one alpha hydrongen
    B
    self condensation of ketones only having atleast one alpha hydrogen
    C
    self condensation of both aldehydes and ketones havings atleast one alpha hydrogen
    D
    self condensation of both aldehydes and ketones having no alpha hydrogen

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

    A
    `C_(6) H_(5) CHO`
    B
    `CH_(3) CH_(2) CHO`
    C
    `CH equiv C - CHO`
    D
    `CH_(2) = CH - CHO`

    • Similar Questions

    Explore conceptually related problems

    Ethanal and propanone undergoes aldol condensation reaction inpresence of dilute alkali to form

    Butanal undergoes aldol condensation to give

    This does NOT undergo aldol condensation :

    Propanal and propanone undergoes condensation reaction in presence of dil . KOH to form,

    Assertion (A) : Ethanal on treatment with dilute alkali and subsequent heatiing gives but-2-enal. Reason (R ) : Aldehydes and ketones having at least one alpha -hydrogen undergo reaction in the presence of dilute alkali to form aldol.

    Home
    Profile