Question

In the following reaction,
$C{H}_3\stackrel{\begin{array}{c}O\\ \parallel \end{array}}{C}OH+C{H}_{3}C{H}_2\stackrel{18}{O}H⟶C{H}_3\stackrel{\begin{array}{c}O\\ \parallel \end{array}}{C}O{C}_2{H}_5+H_{2}O$
molar mass difference between water formed in the reaction and ordinary water is X unit. Find out the value of X.

• A. $X=0$
• B. $X=1$
• C. $X=2$
• D. None of these

Answer 1

The correct option is A $X=0$

In esterification reaction, the OH from acid and H from alcohol is removed as water.

This means the isotopically labelled oxygen becomes part of ethyl acetate. It is not a part of water.

In the given reaction, the molar mass difference between water formed in the reaction and ordinary water is 0 unit.

Option A is correct.