Estimate the pKa values of the following compounds: a.

CH_3CH_2CH_2NH_2,
CH
3
​
CH
2
​
CH
2
​
NH
2
​
,

b.

CH_3CH_2CH_2OH,
CH
3
​
CH
2
​
CH
2
​
OH,

c.

CH_3CH_2COOH,
CH
3
​
CH
2
​
COOH,

d.

CH_3CH_2CH_2^+NH_3
CH
3
​
CH
2
​
CH
2
+
​
NH
3
​