Question

Which of the following groups does not show positive Resonance (+ R) effect?
- CN
- NHCOR
OOO
-
NH2
- NR2​

Answer 1

Answer:

I don't know about it

PL PL MARK ME BRAILIST ANSWERS PL MARK

Answer 2

ANSWER: -CN is the answer .. it is the -R Effect..

all other groups are +R Effect