1. what should be the limiting reagent in this reaction? the theoretical stoichiometric ratio between reactants benzaldehyde and acetone is 2: 1. we used more than that in this lab. why is this ratio (or more) necessary?
2. why do you wash the reaction mixture twice with water?
3. what is the minor product of this reaction? draw its structure and name it.
4. in the ir spectrum of pure dibenzalacetone, a peak appears at 1639 cm-1, which you might have predicted at 1710 cm-1. identify the functional group and explain why it appears in a different region than expected.

vanderwaal's forces of attraction are the electrostatic intermolecular forces that exist in a molecule due to the temporary or permanent dipoles that are developed in a molecule. in , the major intermolecular forces are dipole-dipole interactions as the molecule is polar (bent structure). so the vanderwaal's forces of interaction in between molecules are the permanent dipole-dipole interactions that develop due to the dipole that exists in between the polar h - s bond. the positively charged hydrogen atom is attracted towards the negative end of the dipole that is sulfur of the adjacent molecule. therefore, these forces of attraction are relatively stronger than that of london dispersion forces that exist in non polar molecules.

pv=nrt

explanation: