Hii...so the answer is
The four layers are the external oblique, internal oblique, transverse abdominals.
hope u will like it.:)
The synthesis of diphenylacetylene from mesostilbene dibromide includes next reactions:
• Bromination of stilbene-it is the reaction of electrophilic adition and bromonium ion is formed as intermedier (meso compound is the product).
• Bimolecular elimination-strong base is used in this reaction (takes away the H) and pi bond is formed.
It is called a derived character. Hope this helps! (:
