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Which of the following reagents will not yield alkene?

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Which of the following reagents will not yield alkene?
A. `C_(2)H_(5)OH overset("HI/Red P")underset(150^(@)C)rarr`
B. Refluxing butanone with Zn/Hg-HCl
C. Hydroxylation of ethyne
D. Electrolysis of sodium propionate solution
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Correct Answer - C
Hydroxylation of ethyne produces ethanol
`CH-=CH+H_(2)O overset(H_(2)SO_(4))underset(Hg^(2+))rarr CH_(3)CHO`
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