A) Substitution
B) Elimination
C) Addition
D) Rearrangement
Correct Answer: B
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. \[\underset{\text{ethanol}}{\mathop{\overset{\beta }{\mathop{C}}\,{{H}_{3}}\overset{\alpha }{\mathop{C}}\,{{H}_{2}}OH}}\,\xrightarrow{+\,{{H}^{+}}}\overset{\beta }{\mathop{C}}\,{{H}_{3}}\overset{\alpha }{\mathop{C}}\,{{H}_{2}}\overset{+}{\mathop{O}}\,{{H}_{2}}\xrightarrow[-{{H}_{2}}O]{}\] \[\overset{\beta }{\mathop{C}}\,{{H}_{3}}\overset{\alpha }{\mathop{C}}\,H_{2}^{+}\xrightarrow[-{{H}^{+}}]{}\underset{\text{ethene}}{\mathop{\overset{\beta }{\mathop{C}}\,{{H}_{2}}}}\,=\overset{\alpha }{\mathop{C}}\,{{H}_{2}}\]
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