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Q.
The charring of sugar takes place when treated with concentrated $ H_{2}SO_{4} $ . What is the type of reaction involved in it?
EAMCETEAMCET 2014
Solution:
The charring of sugar is its dehydration process. When sugar is treated with conc. $H _{2} SO _{4}$, water molecules gets escaped and sugar charcoal is formed. Due to its further reaction with acid, smell of $SO _{2}$ is obtained.
$\underset{\text{Sugar }}{C _{12} H _{22} O _{11}}+\left[ H _{2} SO _{4}\right] \longrightarrow \underset{\text{Sugar charcoal }}{12 C +[ H _{2} O +} H _{2} SO _{4}]$
$C +2 H _{2} SO _{4} \longrightarrow 2 SO _{2}+ CO _{2}+2 H _{2} O$