Freons are not recommended to be used in refrigerators because they:

cause global warming

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cause acid rain

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cause depletion of ozone layer

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cause very less cooling

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Solution

The correct option is D cause depletion of ozone layer
Freon is basically a gas which is used for cooling. It is non-flammable substance, but if it leaks it smells like fresh-cut grass. As the CFC's causes depletion of the ozone layer, freons are not used as coolants anymore.

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