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24. Option 2 will be the right answer. since trans product has less steric hinderance that forms out as a major product. Initially oxidative addition between Pd and R-X(double bond compound) takes place the transmetallation followed by reductive elimination occurs. During transmetallation 2 intermediate possible leading to 1 and 2 as product but the Major product will be the Option 2.
25.
In the Heck coupling Option 2 will be the correct answer. The catalyst form complex with alkenyl compound by oxidative addition, then Pd-pie complexation occurs followed by reductive elimination leading to Option 2 as the product.
26. The IUPAC name of the compound is Option 2: 2,4-dibromophenol.
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