Which of the following statements is NOT true in regards to water, ethanol, and isopropanol?
A. Water has the highest boiling point.
B. H-O-H and C-O-H bond angles are all equal to 1095.
C. Dispersion forces affect all three molecules.
D. Two lone pairs of electrons are assigned to the oxygen in each Lewis structure of all three molecules.
E. All of these are true.
A is true.
B isn't true.
C is true.
D is true.
Because B isn't true, then E isn't true.
To determine which statement is NOT true, let's analyze each option.
A. Water has the highest boiling point: This statement is true. Water has a high boiling point due to its strong hydrogen bonding.
B. H-O-H and C-O-H bond angles are all equal to 109.5°: This statement is NOT true. The bond angle in water (H2O) is actually about 104.5° due to the presence of two lone pairs of electrons on the oxygen atom, which repel the bonded hydrogen atoms.
C. Dispersion forces affect all three molecules: This statement is true. Dispersion forces, also known as London forces or Van der Waals forces, exist between all molecules. They result from temporary fluctuations in electron distribution and affect water, ethanol, and isopropanol.
D. Two lone pairs of electrons are assigned to the oxygen in each Lewis structure of all three molecules: This statement is true. In the Lewis structures of water, ethanol, and isopropanol, oxygen is surrounded by two lone pairs of electrons, along with the bonded atoms.
Now, since statement B is the one that is NOT true, the correct answer is:
The statement that is NOT true in regards to water, ethanol, and isopropanol is B. H-O-H and C-O-H bond angles are all equal to 109.5°.
Therefore, the answer is B.