Discussion: Explain how your data gives evidence of correct product identity and purity.
Include:
a. A comparison of IR and NMR spectra with that of starting material as well as what is predicted for pure product.
b. Comparison of observed melting point with a true melting point.
c. Comparison of TLC Rf values of starting material provided pure product and your product.

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.

gas

explanation:

smoke is the matter of a gas