Question

What is an active methylene group give two examples?

Answer 1

Answer:

Active methylene group is that group which has two -I or -R groups on its either side. Hence the hydrogens of this -CH2 group are extremely acidic. For example , considering acetyl acetone.

I hope this will help

Answer 2

An active methylene group is one where two electron-withdrawing groups are attached to it.

Examples are acetoacetic esters and cyanoacetic esters.

• We know carbon has four valencies.
• CH₂ group is called methylene group, we can see two valencies of carbon are not satisfied here.
• When the remaining valencies are satisfied by electron-withdrawing groups, then such methylene groups are called active methylene.
• When electron-withdrawing groups are attached to the carbon the hydrogens of the methylene group become more acidic.
• #SPJ2