26.5k views
3 votes
Is the first step of EAS highly endothermic or exothermic?

User Tomasita
by
8.5k points

1 Answer

2 votes

Final answer:

The first step of an electrophilic aromatic substitution (EAS) is highly endothermic as it involves bond breaking which requires an input of energy, resulting in a positive change in enthalpy (ΔH).

Step-by-step explanation:

The student asks whether the first step of an electrophilic aromatic substitution (EAS) is highly endothermic or exothermic. The first step of EAS is characterized by the breaking of bonds in the reactants to form intermediates and is usually associated with the absorption of energy, which corresponds to an increase in enthalpy (ΔH positive). Therefore, it is indeed an endothermic process.

For example, when considering the formation of a solution in both exothermic and endothermic scenarios, the initial steps that involve the separation of solvent and solute particles are always endothermic (ΔH positive). It is only the later interaction between solute and solvent that may result in an exothermic release of energy if interactions are favorable. This aligns with the principle that breaking bonds requires energy input, while bond formation releases energy.

User Torxed
by
8.2k points

Related questions

asked Oct 27, 2024 121k views
Ravindra HV asked Oct 27, 2024
by Ravindra HV
8.1k points
1 answer
5 votes
121k views
asked Oct 13, 2024 228k views
Grrigore asked Oct 13, 2024
by Grrigore
8.4k points
1 answer
5 votes
228k views
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.