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Which have active methylene group?...

Which have active methylene group?

A

B

C

D

Text Solution

Verified by Experts

The correct Answer is:
A,B,C,D
All contains `CH_(2)` groups adjacent to strong electron withdrawing group
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The base catalysed addition of a compound having active methylene group (or relatively acidic hydrogen) to activate alkene is known as Michael addition reaction.

The base catalysed addition of a compound having active methylene group (or relatively acidic hydrogen) to activate alkene is known as Michael addition reaction.

The base catalysed addition of a compound having active methylene group (or relatively acidic hydrogen) to activate alkene is known as Michael addition reaction. Find out product of following reaction :

a. Write the stable tautomer form the following: b. Explain why alpha methyl acetone enolises to a smaller extent than acetylacetone. c. Why is the (-CH_(2)-) group in acetyl acetone (Me-oversetOoverset(||)C-CH_(2)-oversetO overset(||)C-Me) called active methylene group?

Which of the following compounds contain active methylene group ?

Benzoin condensation Reaction|| Benzil-Benzilic acid Rearrangement||Reformatsky Reaction||Reaction OF active methylene group|| Knoevenagel Reaction|| Michael addition Reaction

Statement-I: CH_(3)COCH_(2)COCH_(3) does not respond to the iodoform test with I_(2)//OH^(-) . Statement-II Presence of active methylene group attracts the base.

Aldol condensation| self aldol condensation| cross aldol condensation|active methylene group

Active methylene compounds are of great importance in synthetic chemistry. When –CH_(2) (methylene) group is flanked between two electron withdrawing groups, then its hydrogen becomes acidic and can be replaced easily. The acidity of methylene hydrogen depends upon the strength of electron withdrawing group. Acetoacetic ester, malonic ester, etc. are the examples of active methylene compound. In synthetic application acidic hydrogen is trapped by a strong base to get resonance stabilised anion which reacts accordingly to give the desired product. Which one of the following is most effective as an active methylene compound ?