Indicate how you would synthesize each of the following substances from the given organic starting materials and other necessary organic or inorganic reagents. Specify reagents and conditions. (b) \(\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CH}-\mathrm{CH}_{2} \mathrm{Br}\) from \(\left(\mathrm{CH}_{3}\right)_{3} \mathrm{COH}\) (c) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{C}\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CHO}\) from \(\left(\mathrm{CH}_{3}\right)_{2} \mathrm{C}(\mathrm{OH}) \mathrm{CH}_{2} \mathrm{CH}_{3}\) (d) \(\mathrm{CH}_{3} \mathrm{OCH}_{2} \mathrm{CH}_{2} \mathrm{OCH}_{3}\) from ethylene

(b) To synthesize \(\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CH}-\mathrm{CH}_{2} \mathrm{Br}\) from \(\left(\mathrm{CH}_{3}\right)_{3} \mathrm{COH\), first react with H2SO4 to form \(\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CH}-\mathrm{CH}_{2}\), then use NBS in the presence of light to add the bromine, forming the desired compound. (c) To synthesize \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{C}\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CHO}\) from \(\left(\mathrm{CH}_{3}\right)_{2} \mathrm{C}(\mathrm{OH}) \mathrm{CH}_{2} \mathrm{CH}_{3}\), first oxidize using PCC to form \(\mathrm{CH}_{3}\mathrm{CH}_{2} \mathrm{C}\left(\mathrm{CH}_{3}\right)_{2}\mathrm{C}=O\), then react with CH3MgBr to form the final product. (d) To synthesize \(\mathrm{CH}_{3} \mathrm{OCH}_{2} \mathrm{CH}_{2} \mathrm{OCH}_{3}\) from ethylene, first perform epoxidation using m-CPBA, then react with NaOMe in methanol to open the epoxide ring and form the desired compound.