The chemical substance of photochemical smog responsible for eye irritation is

Determine whether the following statements are true or false:
$(1)$ The lowest region of the atmosphere where all living organisms,including humans,reside is called the troposphere.
$(2)$ The troposphere extends up to a distance of $25 \ km$ from sea level.
$(3)$ The region between $10 \ km$ and $50 \ km$ from sea level is called the stratosphere.
$(4)$ The ozone layer that protects living organisms is located in the troposphere.

Identify the wrong statement among the following:

$CF_xCl_y$ (where $x + y = 4$). These compounds are not used because

Explain the effects of acid rain on the Taj Mahal.

Mention the harmful effect of ultra violet radiations.