Some halogen containing compounds are useful in daily life. Some compounds of this class are responsible for exposure of flora and fauna to more and more of UV light which causes destruction to a great extent. Name the class of these halocompounds. In your opinion, what should be done to minimise harmful effects of these compounds.

<p><span data-teams="true">This is a long answer type question as classified in NCERT Exemplar</span></p><p>Multiple halogen groups are present in these carbon compounds, which have a wide range of applications in industry. Polyhalogen compounds are what they're called. The following are the different chemicals and their impact on life:</p><p><strong>1. Dichloromethane</strong>, commonly known as methylene chloride, is a solvent that is used as a paint remover, an aerosol propellant, a process solvent in drug manufacturing, and a metal cleaning and finishing solvent. The central nervous system has been documented to be harmed by dichloromethane. Low amounts of this chemical might cause mild hearing and visual impairment, while larger levels in the air can induce dizziness, nausea, tingling, and numbness in the fingers and toes. Methylene chloride produces severe burning and moderate skin redness in humans when it comes into close contact with the skin. The cornea can be burned by direct contact with the eyes.</p><p><strong>2. Trichloromethane or Chloroform:</strong> This is mostly utilised as a solvent for lipids, alkaloids, iodides, and other compounds, and it is also used to make Freon R-22. It used to be used as an anaesthetic in medicine, but now it's replaced with less harmful alternatives like ether. Chronic exposure to chloroform, which is transformed to phosgene and causes liver and kidney damage as well as skin ulcers, is deadly.</p><p><strong>3. Tetrachloromethane</strong>, also known as carbon tetrachloride, was commonly utilised to make cleaning solutions, chlorofluorocarbons, and aerosol propellants. The use of <strong>CCl₄</strong> has resulted in the loss of the ozone layer, which shields the planet from UV radiation, leading to an increase in skin cancer and other diseases.</p><p><strong>4. DDT, or p, p'-dichlorodiphenyltrichloroethane</strong>, was a commonly used pesticide. They're chlorinated organic pesticides that became popular after WWII due to their excellent effectiveness against malaria-causing mosquitoes and typhus-carrying lice. The major consequences began with insects developing resistance to DDT and a high toxicity to fish. The issue was exacerbated by DDT's chemical persistence and fat solubility. In terms of chemistry, DDT is not metabolised or solubilized well by mammals. The fatty tissues are where it is deposited and kept. DDT builds up within the animal over time if it is consumed at a constant pace, harming the ecosystem.</p>

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