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Organic Compounds

Which of the ...

Question

Which of the following structures contain active methylene group?

A

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B

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C

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D

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Solution

The correct option is A
Methylene group having two strong electron withdrawing groups attached on its either side.

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Similar questions

Q. Which of the following does not have an active methylene group?

Q. Malonic ester contains an active methylene group and two hydrogen atoms of active methylene group are easily replaced by alkyl and acyl groups in the presence of strong base. The carbonation intermediate formed, makes

S_{N_{2}}

attack on alkyl or acyl groups.
Which of the following is formed as the final product in the sequences of reaction?

Q. Malonic ester contains an active methylene group and two hydrogen atoms of active methylene group are easily replaced by alkyl and acyl groups in the presence of strong base. The carbonation intermediate formed, makes

S_{N_{2}}

attack on alkyl or acyl groups.

Consider the following set of sequential reactions. The end product [E] is:

Q. The acid strength of active methylene group in given compounds decreases as:
a)

C H_{3} C O C H_{2} C O O C_{2} H_{5}

C H_{3} C O C H_{2} C O C H_{3}

C_{2} H_{5} O O C C H_{2} C O O C_{2} H_{5}

Q. Which of the following structure contain a hemiacetal group?

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