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(C) The reaction of an internal alkyne with $H_2O$ in the presence of $Hg^{2+}/H^+$ is a hydration reaction. For an unsymmetrical internal alkyne,the

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$O_2N-C_6H_4-CH_2-CO-C_6H_4-OCH_3$

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(C) The reaction of an internal alkyne with $H_2O$ in the presence of $Hg^{2+}/H^+$ is a hydration reaction. For an unsymmetrical internal alkyne,the regioselectivity is determined by the stability of the intermediate carbocation formed during the electrophilic attack of $Hg^{2+}$. The $Hg^{2+}$ ion coordinates with the triple bond to form a mercurinium ion. Water attacks the carbon that can better stabilize the positive charge in the transition state. The $-OCH_3$ group is electron-donating (via resonance),which stabilizes the positive charge on the adjacent carbon atom more effectively than the electron-withdrawing $-NO_2$ group. Therefore,the water molecule attacks the carbon atom closer to the $p-methoxyphenyl$ group,leading to the formation of the ketone $O_2N-C_6H_4-CH_2-CO-C_6H_4-OCH_3$.

The major product obtained from the following reaction is

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