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Draw the curved arrow mechanims for the reactions of but-1-yne with catalytic trifilic acid in water to form butan-2-one,

I just can't seem to figure out the last step! Thank you in advance! Draw the curved arrow mechanism for the reaction of but-1-yne with catalytic triflic acid in water to form butan-2-one. Follow the instructions under the boxes for each step. Draw all electrons and charges if necessary on all structures, do not show any inorganic side products Add any necessary atoms, electrons, and charges to the carbon structures above to show the proper mechanistic intermediates, and draw curved arows to ?how the next mechanistic steps Draw curved arows above to show the next mechanistic step Draw curved arows above to show the next mechanistic step. stepl step2 CH2 CH2 H3C ??? ??? Did you draw all of the arrows correctly? Did you draw the electrons and charges? Did you specify the correct mechanisms in each step? Add any necessary electrons and charges to show the proper resonance structure, and draw curved arrows to show the mechanistic step eading to butan-2-one Draw curved arrows above to show the next mechanistic steps.

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