Answer
See explanation
Work Step by Step
To find out the hybridization of N atom, we have to count the no. of sigma bond and lone pair attached with the N atom. total no. = 4 means $sp^{3}$, 3 means $sp^{2}$ and 2 means $sp$.
Single bond means sigma bond.
Double bond has one sigma and one pi bond.
a) Minoxidil would be more soluble in basic aqueous solution. This is because N atoms present in the molecule in the form of $-NH_{2}$ which has lone pair in it. So, it can act as a lewis base & donate the electron pair to a lewis acid.
b) See below figure.
c) See below figure.
d) $a = 109.5^{\circ}, b= 109.5^{\circ}, c= 120^{\circ}, d= 120^{\circ} e = 120^{\circ}$
e) $\sigma$ bond = 31
$\pi$ bond = 3.
