Reason : The alkyl groups donate electrons to the nitrogen atom by +I effect Among the amines, secondary amines are more basic than primary amines.
Reason: In secondary amines there are more alkyl groups so there is more electron density on the nitrogen atom as compared to the primary amine.
$I.$ ${Sn}-{HCl}$ $II.$ ${Sn}-{NH}_{4} {OH}$ $III.$ ${Fe}-{HCl}$ ${IV} . {Zn}-{HCl}$ $V.$ ${H}_{2}-{Pd}$ $VI.$ ${H}_{2}-$ રેની નિકલ