... the intermolecular forces, and the higher the surface tension CH3 CH 2CH2 OH < HOCH 2CH2 OH < HOCH 2CH( OH )CH2 OH 12. 64 CH3 OH > H2CO > CH3 CH3 The intermolecular forces would decrease as shown (hydrogen... present in each molecule HOCH 2CH( OH )CH2 OH with three O–H groups can form more hydrogen bonds than HOCH 2CH2 OH with two O–H groups, which in turn can form more hydrogen bonds than CH3 CH 2CH2 OHwith... tension (Problem 12. 61) HOCH 2CH( OH )CH2 OH > HOCH 2CH2 OH > CH3 CH 2CH2 OH The greater the number of hydrogen bonds, the stronger the intermolecular forces, and the higher the viscosity 12. 66 Viscosity