Which of the following is a +I group?

Options

A. `-overset(O)overset(||)(C)-H`
B. `-overset(O)overset(||)(C)-Me`
C. `-overset(O)overset(||)(C)-NH_(2)`
D. `-overset(O)overset(||)(C)-O^(Theta)`

Answer

4

Explanation

A,B,C have -I effect. In 'D' due to stron +I of `-O^(-)`, it has +I effect