[BloodCrisis]

This is one of the three excercises I need to answer. Please if somebody can help me; Karma will bless you (Or may be universe eqilibrium o whatever yo call it xP)

[orgopete]

Which is a better electron donor, CH3 or H?

[Borek]

You have to show your attempts at solving the question to receive help. This is a forum policy.

[BloodCrisis]

Sorry Borek, I didn't know that. Now I do.

"orgopete"...Ch3 groups have an I+ effect, better than H. Ch3 will reduce the (+) local electron density of the C of de carbonilyc group makin' it less reactive to an NA.

Alifatic groups have an I- effect but a more powerful M+ effect by resonance.
So...
the problem is that... I know that "c" is more reactive than "a". but i don't know if resonance effect is strong enough to surpass those methilic groups on... my guess is

(reactivity)

b<a<c