Chapter 5.4, Problem 16ATS

Interpretation Introduction

Interpretation:

To calculate the observed rotation of given molecules.

Concept Introduction:

Observed rotation: The sample of a compound is the angle by which it rotates the plane of polarized light, measured using the polarimeter. Further observed rotation of a sample of a compound depends on the concentration if a solution is used for the experiment (or) density of the sample is neat.

The observed rotation of a molecule can be calculated by using the formula given below.

$\begin{array}{l}[\alpha ]=\frac{\alpha }{c\times l}\\ \alpha =[\alpha ]\times c\times l\end{array}$

$\begin{array}{l}\text{alpha }\left(\text{α}\right)\text{ represents the observed rotation measured with a polarimeter}\text{.}\\ \text{ l represents the length of the sample tube}\text{. }\\ \text{C is the concentration of a solution of a pure sample}\text{.}\end{array}$

To identify: The given molecules observed rotation should be identified.