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  4. In the following reaction, H3 C-C≡ ≡ C-H xrightarrow[H3O+] Hg2+X xrightarrow[phCHO]dil.NaOH Y X and Y, respectively, are

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Q. In the following reaction, $H_3 C-C\equiv \equiv C-H \xrightarrow[{H_3O^{+}}] {Hg^{2+}}X \xrightarrow[{phCHO}]{dil.NaOH} Y$ $X$ and $Y$, respectively, are

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Solution:

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In first step one molecule of water adds to alkyne on warming with mercuric sulphate and dilute sulphuric acid to form carbonyl compound, i.e. acetone. In second step $2$ molecules of acetone condense in presence of dil. $NaOH$ to form $\alpha$, $\beta$-unsaturated ketone. This reaction is known as aldol condensation