This set contains the spectra of benzil, biphenyl, and bibenzyl, three compounds used in the melting point experiment. using your knowledge of ir spectroscopy and the structures of these three compounds, determine which spectrum belongs to which compound and give a brief (one sentence) explanation of your choice.

Spectrum 1- Biphenyl

Spectrum 2 - Benzil

Spectrum 3 - Bibenzyl

Explanation:

For Benzil:

The Spectrum -  2  shows this compound.The C=O and C-H bond stretching observed at following values.

For Biphenyl:

Spectrum -  1  shows this compound.

There are stretching vibrations from due to C-H stretching and C-C stretching respectively of aromatic ring only.

For Bibenzyl:

Spectrum - 3  shows this compound

There are stretching vibrations at due to C-H stretching and C-C stretching of aromatic ring.

Along with this, stretching vibrations at due to C-H of alkyl.

A: 0.67

The situation described in the question is analogous to a semipermeable membrane. Water is able to pass through aquaporin channels present in the liposome, but large uncharged particles (glucose) and ions (K+ and Cl -) are impermeable and will remain trapped within the liposome. If assumed to be ideal, the osmotic pressure, π, exerted by the solution due to molarity differences across the membrane is defined as π = iMRT, where i is the van't Hoff factor, M is the molarity of the solution, R is the universal gas constant, and T is the absolute temperature of the solution. A change in osmotic pressure at constant temperature is due to changes in iM, a term that is equivalent to the concentration of dissolved particles produced by solute in solution. When compared to the original volume of 1 M glucose, the new combined solution has twice the volume and three times the number of dissolved particles (1 M KCl, a strongly electrolytic solution, produces 1 M concentrations of both K+ and Cl- in solution), or an increase in the concentration of dissolved particles by a factor of 1.5. This is equivalent to a combined molarity of dissolved particles of 1.5 M. The ratio of osmotic pressure is then [1 M dissolved glucose] / [1.5 M dissolved glucose + KCl] = 0.67

Explanation: