KCET2014ChemistryGeneral Principles and Processes of Isolation of Metals
The acid strength of active methylene group in (a) ( CH ₃ COCH ₂ COOC ₂ H ₅ ) (b) ( CH ₃ COCH ₂ COCH ₃ ) (c) ( C ₂ H ₅ OOCCH ₂ COOC ₂ H ₅ ) decreases as
Options
- A( a>b>0 )
- Bc> a> b
- C( a>c>b )
- D( b>a>c )
Correct answer
D. ( b>a>c )
Step-by-step solution
An active methylene compound is a compound that has the following general structural formula. Where, ( E₁ ) and ( E₂ ) are functional group that withdraws electron by resonance. After the removal of hydrogen from the active methylene groups, the carbanion thus, formed is stabilized by the resonance. Greater the stabilization of the carbanion, greater will be the acidic strength of the active methylene groups. (।) ( CH ₃ COCH ₂ COOC ₂ H ₅ ) So, ketonic groups stabilized more carbanion ion than the ester or carboxyli