Doubt by Akanksha Sarda

Which is the weakest base (1)C6H5-CH2-NH2 (2) C6H5-CH2-NH-CH3 (3) O2N-CH2-NH2 (4) CH3-NH-CHO. please explain

Answers

Answer by Rishikant Pandey

option 4 is correct

because basic character increases by donation of electron by nitrogen 

cho no2 are electron withdrawing group which makes nitrogen not to donate electron easily

in the option (4) cho is directly attached to nitrogen of amine group