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Q.
Dehydration of alcohol is an example of which type of reaction?
AFMCAFMC 2011
Solution:
Dehydration of alcohol involves the loss of two atoms or groups from the adjacent carbon atoms, hence it is an example of $\beta$-elimination reaction.
$\underset{\text{ ethanol}}{\overset{\beta}{C} H _{3} \overset{\alpha}{C} H _{2} O H} \stackrel{+ H^+ }{\longrightarrow } \overset{\beta}{C} H _{3} \overset{\alpha}{C} H _{2} \overset{+}{O} H _{2} \xrightarrow[- H _{2} O ]{}$
$\overset{\beta}{C} H _{3} \overset{\alpha}{C} H _{2}^{+} \xrightarrow [-H^+]{}\underset{\text{ethanol}}{\overset{\beta}{C} H _{2}}= \overset{\alpha}{C}H _{2}$