Answer:
ethyl methyl ketone and triphenyl(propylidene)phosphorane is used here to give the wittig reaction.
Explanation:
In wittig reaction, aldehyde and ketones are converted to alkenes in presence of ylide.
ylide attacks at carbonyl group resulting formation of a 4-memeberd intermediate. Then this 4-membered ring cleaves to give alkene.
Ylides used in wittig reaction are generally prepared from primary halides.
Preparation of ylides as well as reaction mechnism has been shown below.
