Question

9.(4 points) Which choice correctly explains the pka values below? OH тон pka = 4.20 pka = 15.4 O Resonance stabilization of the conjugate base makes the first molecule more acidic OC=O makes the first molecule less acidic O A second nearby oxygen makes the first molecule less acidic O Bonding aryl vs benzyl makes the first molecule more acidic First molecule is sp2 while the second one is sp3 predicts the observed values

Answer 1

First point is correct.

Conjugate base of first molecule is resonance stabilized, so it is more acidic.

One should remember that lower the value of pKa more it will be acidic. And also that higher the stability of conjugate base, the molecule is more acidic.

Conjugate base means remaining molecule after removing acidic hydrogen, more stability of conjugate base more it is acidic.

See below how it's conjugate base is resonance stabilized.

Hope it helps you.

Ocu CS оң conjugate base orient m (ecorating aboutond] 10 tuo OH - This molecule has no resonating structure, so lens stables CS Scanned with CamScanner