Explains what are the molecular orbitals present in hydrocarbons and how they are formed by atomic, hybrid and non-hybrid orbitals; describe the steps of the electrophilic addition and explain why the π bond is broken between the two carbon atoms and not the σ bond?

pop pop pop on a opp

pie chart because it is in percents ( % )

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

i think it's letter a.