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Pinky chaudhary
methyl group is EDG so it will show +I effect and increase the electron density on the Nitrogen group and make the lone pair of nitrogen more available for donation. as the donation increases the basicty increases. but in second case the no of benzene is increasing. as the benzene increasing the -I effect increasing and the basicty decreasing because the lone pair of nitrogen are going in resonance with benzene hence less available for donation therefore the basic character decreasing as the benzene group increasing