Give test to differentiate 1, 1 - dichloroethane and 1, 2 - dichloroethane :

2, 4 - DNP then aq. KOH

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aq. KOH then 2, 4 - DNP

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N a H S O_{3}

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Lucas reagent

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Solution

The correct option is B aq. KOH then 2, 4 - DNP
$C H_{3} - C H | - C l a q . K O H - ---- \to C H_{3} - C H O 2, 4 - D N P - ----- \to$ positive test
$C l$
$C | H_{2} - C | H_{2} a q . K O H - ---- \to C | H_{2} - C | H_{2} 2, 4 - D N P - ----- \to$ negative test
$C l$ $C l$ $O H$ $O H$

As $2, 4$ $D N P$ test is positive for aldehyde not for alcohol. Thus the best reagent to differentiate is aqueous $K O H$ & then $2, 4 - D N P$ .

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