This is a basic Claisen condensation reaction in which the functions to take off the acidic hydrogen (between the ketone and the ester) and then the same molecule can attack a carbonyl carbon to yield .

The attack at the ester carbonyl leads to the leaving of group.

This is a basic Claisen condensation reaction in which the functions to take off the acidic hydrogen (between the ketone and the ester) and then the same molecule can attack a carbonyl carbon to yield .

The attack at the ester carbonyl leads to the leaving of group.

This is a basic Claisen condensation reaction in which the functions to take off the acidic hydrogen (between the ketone and the ester) and then the same molecule can attack a carbonyl carbon to yield .

The attack at the ester carbonyl leads to the leaving of group.

Alkenes are saturated by hydrogen gas in the presence of a palladium catalyst. This type of reaction is termed catalytic hydrogenation and results in syn addition of hydrogen across a double bond. Molecules II, III, and IV have all undergone oxidation-reduction reactions and do not result from the given conditions. Molecule I is altered only by hydrogenation of the 2-3 double bond and is the correct answer.

Treatment of ethyl acetate with methoxide will yield the enolate ion (II). However, side trans-esterification reactions will also result in formation of product III.

Treatment of ethyl acetate with methoxide will yield the enolate ion (II). However, side trans-esterification reactions will also result in formation of product III.

Alkenes are saturated by hydrogen gas in the presence of a palladium catalyst. This type of reaction is termed catalytic hydrogenation and results in syn addition of hydrogen across a double bond. Molecules II, III, and IV have all undergone oxidation-reduction reactions and do not result from the given conditions. Molecule I is altered only by hydrogenation of the 2-3 double bond and is the correct answer.

Treatment of ethyl acetate with methoxide will yield the enolate ion (II). However, side trans-esterification reactions will also result in formation of product III.

Alkenes are saturated by hydrogen gas in the presence of a palladium catalyst. This type of reaction is termed catalytic hydrogenation and results in syn addition of hydrogen across a double bond. Molecules II, III, and IV have all undergone oxidation-reduction reactions and do not result from the given conditions. Molecule I is altered only by hydrogenation of the 2-3 double bond and is the correct answer.

Below is the mechanism for the reaction given which is called the McMurry Reaction. It is a titanium (Ti) prompted pinacol coupling followed by deoxygenation.