Question

which effect will predict that CH3 group is more electron releasing than ethyl group when attached to benzene ring? Explain how?​

Answer 1

Now as ethyl group (-CH2-CH3) has only two hydrogen atoms attached to the α-carbon atom directly linked to the double bonded carbon atom and methyl (-CH3) has three, so the hyperconjugation in ethyl will be lesser than methyl resulting in more electron donating power of methyl than ethyl.