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Dehydrohalogenation for Alkenes

Predict R1, A...

Question

Predict $R_{1}$ , A and $R_{2}$ respectively in the given reaction:
$C H_{3} - C H_{2} - C l R_{1} - \to A R_{2} - \to C H_{3} - C H_{3}$

Alc. KOH, ethene,

H_{2} / P d

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Zn, ethene,

N a / l i q . N H_{3}

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Alc. KOH, ethyne,

N a / l i q . N H_{3}

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Zn, ethene,

H_{2} / P d

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Solution

The correct option is A Alc. KOH, ethene, $H_{2} / P d$
Ist reaction is dehydrohalogenation involves removal of (elimination of) a hydrogen chloride by abstracting $β$ -H from a ethyl chloride in presence of base (alc. KOH) to form ethene.
2nd reaction is hydrogenation of ethene in presence of $H_{2} / P d$ to give ethane.
$C H_{3} - C H_{2} - C l a l c . K O H - ----- \to C H_{2} = C H_{2} H_{2} / P d - --- \to C H_{3} - C H_{3}$

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Similar questions

R_{1}

R_{2}

C H_{3} - C H_{2} - C l R_{1} - \to A R_{2} - \to C H_{3} - C H_{3}

C H_{3} - C H_{2} - C H_{2} - O - C H_{3} + H B r \to

C H_{3} - C H_{2} - C \equiv C H A \to B C H_{3} C \equiv C - C H_{3}

A

B

C H_{3} - O | | C - O - C H_{3} | C | C H_{3} - C H_{3} N a / C_{2} H_{5} O H - ------- \to (X) + (Y)

[X] a n d [Y]

(a) C H_{3} - C H_{2} - O H a n d C H_{3} - C H_{3} | C | C H_{3} - O H

(b) C H_{3} - C H_{2} - O H a n d C H_{3} - C | C H_{3} = C H_{2}

(c) C H_{2} = C H_{2} a n d C H_{3} - C H_{3} | C | C H_{3} - O H

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