Two different bromonium ions are formed because br2 can add to the double bond either from the top of the plane or from the bottomtwo different bromonium ions are formed because {\rm br_2} can add to the double bond blank of the plane defined by the double bond, and the two bromonium ions are formed in equal amounts. of the plane defined by the double bond, and the two bromonium ions are formed in equal amounts.

a) true

b) false

 True

Explanation:  When the alkene is being treated with Br2 in a aprotic solvent, the Br2 will get add on the alkene forming the bromonium ion. This intermediate can be formed from either of the side depending on the substituents of the alkene.

Thus, the two bromonium ions are formed in equal amounts. The alkene is acting as the elctrophile and the Br2 will act as the nucelophile as its antibonding orbital is higher in energy.

d. temperate deciduous forest

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation: