State the uses of halogen-containing organic compounds.

(N/A) Halogen-containing organic compounds have various applications:
$1$. They are used as solvents for relatively non-polar compounds and as starting materials for the synthesis of a wide range of organic compounds.
$2$. $Chloramphenicol$,a chlorine-containing antibiotic produced by microorganisms,is very effective for the treatment of typhoid fever.
$3$. Our body produces an iodine-containing hormone,$thyroxine$,the deficiency of which causes a disease called goiter.
$4$. Synthetic halogen compounds,such as $chloroquine$,are used for the treatment of malaria,and $halothane$ is used as an anaesthetic during surgery.
$5$. Certain fully fluorinated compounds are being considered as potential blood substitutes in surgery.