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Dehydrohalogenation for Alkenes

How is ethene...

Question

How is ethene prepared by:
(a) dehydrohalogenation reaction
(b) dehydration reaction?
Given equations and name the products formed.

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Solution

Each part: 1 Mark

(a) $C H_{3} - C H_{2} E t h y l c h l o r i d e - C l + K O H (a l c .) Δ \to C H_{2} = C H_{2} E t h e n e + K C l + H_{2} O$

(b) $C H_{3} - C H_{2} E t h y l a l c o h o l - O H C o n c . H_{2} S O_{4} - ------- \to 160 - 170^{\circ} C C H_{2} = C H_{2} E t h e n e + H_{2} O$

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