Question

A mixture of pentane, hexane, and heptane was analyzed by gas chromatography. The boiling points of each component of the mixture are shown below.
Which of the following is MOST likely to represent the identity of each peak in the gas chromatograph?

Compound	Boiling Pt ${(}^{\circ }C)$
$C_5{H}_{12}$	$36.1$
$C_6{H}_{14}$	$68.0$
$C_7{H}_{16}$	$98.4$

• A. $A=pentane$
  $B=hexane$
  $C=heptane$
• B. $A=heptane$
  $B=hexane$
  $C=pentane$
• C. $A=hexane$
  $B=pentane$
  $C=heptane$
• D. $A=pentane$
  $B=heptane$
  $C=hexane$

Answer 1

The correct option is A $A=pentane$

$B=hexane$
$C=heptane$

$\begin{array}{c}\text{In gas chromatography plot, the gas which is attending highest}\\ \text{peak is having lowest boiling point.}\\ \text{Thus, by given plot, and data}\end{array}$

$\begin{array}{c}\text{We can say that,}A\to \text{Pentane.}\\ \begin{array}{cc}B& \to \text{Hexane}\\ C& \to \text{Heptane.}\end{array}\\ \text{So, option (A) is correct.}\end{array}$