Question

In the following reaction,

$H_{3}C-C\equiv CH\underset{873K}{\overset{redhotirontube}{\to }}A,$
the number of sigma ($\sigma$) bonds present in the product A is :-

• A. 9
• B. 21
• C. 18
• D. 24

Answer 1

The correct option is B 21

Propyne on passing through red hot iron tube gives 1, 3, 5-trimethyl benzene or Mesitylene.


There are 21 $\sigma$ bonds in mesitylene.