Which of the following elimination reactions will occur to give but-1-ene as the major product?

C H_{3.} C H C l . C H_{2.} C H_{3} + K O H E t o H - -- \to

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C H_{3.} C H C l C H_{2.} C H_{3} + N a O E t E t O H - -- \to △

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C H_{3.} C H_{2.} C H C l . C H_{3} + M e_{3} C O^{-} K^{+} △ \to

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C H_{3} . C H_{2} . C H (O H) . C H_{3} + c o n c . H_{2} S O_{4} \to Δ

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Solution

The correct options are
A $C H_{3.} C H C l C H_{2.} C H_{3} + N a O E t E t O H - -- \to △$
C $C H_{3.} C H_{2.} C H C l . C H_{3} + M e_{3} C O^{-} K^{+} △ \to$
In case of A & D, 2-butene is formed as product but in case of B & C, 1-butene formed as major product.
$C H_{3.} C H C l C H_{2.} C H_{3} + N a O E t E t O H - -- \to △ C H_{3} C H = C H C H_{3}$
$C H_{3.} C H_{2.} C H C l . C H_{3} + M e_{3} C O^{-} K^{+} △ \to C H_{3} C H = C H C H_{3}$

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