Aldehydes and Ketones - Preparation of Ketones

Benzene gets converted to benzaldehyde by Gatterman-Koch's reaction. The appropriate reagent for the conversion is:

Addition of water to alkynes occurs in acidic medium and in the presence of \[\ce{Hg^{2+}}\] ions as a catalyst. Which of the following products will be formed on addition of water to but-1-yne under these conditions.

Compound \[\begin{array}{cc}
\phantom{.....}\ce{O}\\
\phantom{.....}||\\
\ce{Ph - O - C - Ph}
\end{array}\] can be prepared by the reaction of ______.

Write the main product in the following reaction.

\[\ce{2CH3COCl + (CH3)2Cd ->}\]