Draw the curved arrows for the reaction mechanism of 4-methylpentan-2-one to give 2,4-dimethylpent-1-ene and triphenylphosphine oxide.

See picture below

Explanation:

In order to do this, we need to understand what is happening here. As the final product is an alkene and triphenylphosphine oxide, means that the starting reaction was held using methyl-triphenylphosphine. In other words, a wittig reaction which is commonly used to convert ketones or even aldehydes into alkenes.

The first step involves, a nucleophilic attack from the triphenylphosphine to the carbonyl of the ketone.

The second step, the lone pair of the oxygen will go to the atom of phosphorus in the triphenyl to form a complex there.

Following this step into the 3rd step and final step we have a breaking of the bond C - P, and then, the oxygen along with the triphenylphosphine will leave the molecule as leaving group to form the final product.

See the picture below for mechanism and a better understanding

Hope this helps

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."

since electrons are negative the answer is neagtaive