Home
Class 12
CHEMISTRY
Benzaldehyde and formaldehyde do not und...

Benzaldehyde and formaldehyde do not undergo condensation on treatment with NaOH whereas acetaldehyde does. Why?

Text Solution

Verified by Experts

Aldol condensation requires the presence of a-hydrogen atom to give a carbanion > C-CHO. Benzaldehyde and formaldehyde do not contain any a-hydrogen, and hence donot undergo aldol condensation and only give Cannizzaro.s reaction products. Acetaldehyde due to the presence of `alpha`-hydrogen atoms, undergoes aldol condensation.
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • ALDEHYDES, KETONES AND CARBOXYLIC ACIDS

    ICSE|Exercise EXERCISE (PART-II DESCRIPTIVE QUESTIONS) ( SHORT QUESTIONS)|581 Videos

  • ALDEHYDES, KETONES AND CARBOXYLIC ACIDS

    ICSE|Exercise ISC EXAMINATION QUESTIONS (PART-I OBJECTIVE QUESTIONS) (FILL IN THE BLANKS)|27 Videos

  • ALDEHYDES, KETONES AND CARBOXYLIC ACIDS

    ICSE|Exercise EXERCISE (PART-I OBJECTIVE QUESTIONS)|303 Videos

  • ALCOHOLS, PHENOLS AND ETHERS

    ICSE|Exercise ISC EXAMINATION QUESTIONS |25 Videos

  • APPENDIX II ( TYPICAL CONVERSIONS)

    ICSE|Exercise AROMATIC CONVERSIONS |98 Videos

Similar Questions

Explore conceptually related problems

Why does not formaldehyde take part in aldol condensation?

Acetaldehyde undergoes Cannizzaro's reaction on treatment with dilute alkali.

Knowledge Check

  • The compound which does not give iodoform on treatment with NaOH and iodine is

    A
    `CH_(3)OH`
    B
    `CH_(3)CH_(2)OH`
    C
    `CH_(3)CHO`
    D
    `(CH_(3))_(2)CO`

  • The compound which does not give iodoform on treatment with NaOH and iodine is

    A
    `CH_(3)OH`
    B
    `CH_(3)CH_(2)OH`
    C
    `CH_(3)CHO`
    D
    `(CH_(3))_(2)CO`

  • The compound which does not give iodoform on treatment with NaOH and iodine is

    A
    `CH_(3)OH`
    B
    `CH_(3)CH_(2)OH`
    C
    `CH_(3)CHO`
    D
    `(CH_(3))_(2)CO`

    • Similar Questions

    Explore conceptually related problems

    Acetaldehyde undergoes Cannizzaro's reaction on treatment with dilute alkali.

    Phenol and fomaldehyde undergo condensation to give a polymar (A) which on heating with formaldehyde gives a thermosetting polymer (B) Name the polymers. Write the reaction involved in the formation of (A) what is the structural difference between two polymers?

    Benzaldehyde undergoes aldol condensation in an alkaline medium.

    Why does formaldehyde undergo Cannizzaro's reaction while acetaldehyde gives aldol condensation?

    Which undergoes aldol condensation in the presence of dilute NaOH?

    Home
    Profile