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 p-elimination reaction. \[\underset{ethanol}{\mathop{\overset{\beta }{\mathop{C{{H}_{3}}}}\,\overset{\alpha }{\mathop{C{{H}_{2}}OH}}\,}}\,\xrightarrow[{}]{+{{H}^{+}}}\overset{\beta }{\mathop{C{{H}_{3}}}}\,\overset{\alpha }{\mathop{C{{H}_{2}}}}\,\overset{+}{\mathop{O{{H}_{2}}}}\,\xrightarrow[-{{H}_{2}}O]{{}}\] \[\overset{\beta }{\mathop{C{{H}_{3}}}}\,\overset{\alpha }{\mathop{CH_{2}^{+}}}\,\xrightarrow[-{{H}^{+}}]{{}}\underset{ethene}{\mathop{\overset{\beta }{\mathop{C{{H}_{2}}}}\,}}\,=\overset{\alpha }{\mathop{C{{H}_{2}}}}\,\]
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