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Question

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

A
CH3
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B
CH2CH3
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C
C(CH3)3
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D
All of the above.
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Solution

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).

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