DPP – 11GOC4 RESONANCE OR MESOMERIC EFFECT

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1. What is the difference between +R and – R effects?

 

2. Draw the resonance structure of the following  and also mention the type of R effect:

1.  CH2 = CH－Cl

2. CH3－CH  = CH－CHO

3. CH3－CH  = CH－CH2 +

4. 

5.