In an exothermic reaction, the enthalpy change is negative. Which of the following is also true for an exothermic reaction?
2 answers:
<u>Answer: </u>The correct statement is the products have a lower potential energy than the reactants.
<u>Explanation:</u>
Exothermic reactions are defined as the reactions in which the enthalpy change of a reaction is negative.
Enthalpy of a reaction is determined by the equation:
As, the enthalpy change of the reaction is negative, which means that the potential energy of the products is less than the potential energy of the reactants.
Hence, the correct statement is the products have a lower potential energy than the reactants.
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Answer:
a) 2-bromopyrrole
Explanation:
Our options for this questions are:
a) 2-bromopyrrole
b) 2,3-dibromopyrrole
c) N-bromopyrrole
d) 3-bromopyrrole
To understand how the reaction works we have to start with the <u>resonance structures</u>. (Figure 1), on these structures, we will obtain a n<u>egative charge on carbon 2</u> in the pyrrole ring, therefore on this carbon we can generate an attack to an electrophile.
The second step is to check how the mechanism take place. An <u>electrophile is generated</u> by the and
. This electrophile can be <u>attacked</u> by the negative charge on carbon 2 producing the 2-bromopyrrole. (See figure 2).
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