🎴 Flashcard Mode
Preparation of haloalkanes - class-XII
Card1 / 19
Mastered0
Review0
QuestionClick to flip
An organic halide ,${C _2}{H _4}C{l _2}$ gives an unsaturated hydrocarbon on treatment with aloc .KOH,but ethanal on reaction with aq. KOH, the halide is:
AnswerClick to flip back
A
$C{H _3}CHC{l _2}$
💡 Explanation:
Treatment with alcoholic KOH causes dehydrohalogenation to give an unsaturated hydrocarbon, while aqueous KOH substitutes halogens to form a carbonyl compound (ethanal). A geminal dihalide, specifically 1,1-dichloroethane (CH3CHCl2), yields ethanal upon hydrolysis with aqueous KOH.