| Read the assertion and reason carefully to mark the correct option out of the options given below: |
| Assertion: 2 Butanol on heating with \[{{H}_{2}}S{{O}_{4}}\] gives 1 butene and 2 butene. |
| Reason: Dehydration of 2 butanol follows saytzeff rule. |
A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason both are false.
E) If assertion is false but reason is true.
Correct Answer: A
Solution :
[a] In the dehydration of secondary and tertiary alcohols. When there is a possibility of formation of two isomers. The hydrogen atom is preferentially eliminated from the adjacent carbon atom with the fewer number of hydrogen atoms. This is Saytzeff?s rule. \[C{{H}_{3}}-C{{H}_{2}}-\underset{C{{H}_{3}}}{\overset{C{{H}_{3}}}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,H}}}\,-C{{H}_{3}}\underset{10{}^\circ C}{\mathop{\xrightarrow{60%{{H}_{2}}S{{O}_{4}}}}}\,\]\[\underset{\text{1-butene (20 }\!\!%\!\!\text{ )}}{\mathop{C{{H}_{3}}C{{H}_{2}}CH=C{{H}_{2}}}}\,+\underset{\text{2-butene (80 }\!\!%\!\!\text{ )}}{\mathop{C{{H}_{3}}CH=CHC{{H}_{3}}}}\,\]
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