Substitution of an amino group on the para position of acetophenone shift s the carbon double bond oxygen frequency from about 1685 to 1652/cm, where as the nitro attached to the para position yields f frequency of 1693/cm. explain the shift for each substituent from the 1685/cm base value for acetophenone.

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.

i'm pretty sure it is letter c.) car