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Question

Predict R1, A and R2 respectively in the given reaction:
CH3CH2ClR1AR2CH3CH3

A
Alc. KOH, ethene, H2/Pd
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B
Zn, ethene, Na/liq.NH3
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C
Alc. KOH, ethyne, Na/liq.NH3
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D
Zn, ethene, H2/Pd
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Solution

The correct option is A Alc. KOH, ethene, H2/Pd
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 H2/Pd to give ethane.
CH3CH2Clalc. KOH−−−−−CH2=CH2H2/Pd−−−CH3CH3

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