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What is The transmembrane region of the protein is likely to have- and explain in detail?
The transmembrane proteins lie similar to that of the lipid bilayer. The lipid bilayer is hydrophilic in the outer and the inner parts and has a hydrophobic core. 
Similarly, the transmembrane proteins have outer and inner ends which are hydrophilic and a core which is hydrophobic. 
So the transmembrane region of the protein is hydrophobic.