Draw the major organic product of each reaction. Indicate the stereochemistry at the stereogenic center. Omit byproducts such as salts. If applicable, expand octets to minimize formal charges.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

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.