What products are formed from monochlorination of (2r)−2−bromobutane at c1 and c4? draw the products using skeletal structures?

From monochlorination of (2R)−2−bromobutane at C1 is formed (2S)-2-bromo-1-chlorobutane.

From monochlorination of (2R)−2−bromobutane at C4 is formed (2R)-3-bromo-1-chlorobutane.

According to Cahn-Ingold-Prelog rules, the priority of halogen substituents decreases in the following sequence:

-I > -Br > -Cl > -F

According to the rule, chlorine has priority over bromine, so the configuration changes at C1 substitution.

Exothermic,  physical change after it is already baked

A) the enthralling of formation for pure element in its standard state is always positivehope this : )