Question

Which of the following is an example of an electron donating group?

• A. $-C{H}_3$
• B. $-C{H}_2-C{H}_3$
• C. $-C(C{H}_3{)}_3$
• D. All of the above.

Answer 1

The correct option is D All of the above.

Permanent shift in electron density from the substituent towards the carbon chain is called +I effect.
+I group leads to development of ẟ- charge on the carbon atom sharing a bond with the substituent. So, EDG shows +I effect. In option a, b and c, have electron donating groups. So the correct answer is option(d).