Organic Chemistry

I need a list of +r and -r group members

bhavya gupta

14 Years agoGrade

2 Answers

Sakshi

11 Years ago

R effect corresponds to mesomeric effect. It is the phenomenon by which an aromatic ring gets activated at different corners of the ring.(Benzene).
Groups like OH, OR and NH2, NHR, NR2 etc. are found to show +R effects

-R effect is the phenomenon when a functional group participating in resonance induces relatively greater positive charge in the first and the third atom of the ring. Groups like COOH, CHO, NO2, CN and NO etc show -R effect

Kushagra Madhukar

5 Years ago

Dear student,

Please find the answer to your question below.

R effect corresponds to mesomeric effect. It is the phenomenon by which an aromatic ring gets activated at different corners of the ring.(Benzene).

Groups like OH, OR and NH₂, NHR, NR₂ etc. are found to show +R effects

-R effect is the phenomenon when a functional group participating in resonance induces relatively greater positive charge in the first and the third atom of the ring.

Groups like COOH, CHO, NO₂, CN and NO etc show –R effect

Thanks and regards,

Kushagra