Why does the dimethylaniline couple with the diazonium salt at the para position of the ring?

Explanation:

In the coupling reaction of the dimethylaniline and diazonium salt, both electronic and steric factors play a very important role. The resonance structures of dimethylaniline favor electrophilic attack at both the ortho and the para positions. But on the other hand, diazonium coupling produces the majority of  the para product because the steric factor plays role here in this reaction.

The bulky dimethylamino groups on the dimethylaniline make it difficult for electrophile to approach ortho position and also, diazonium ion is relatively large. The two steric factors reduce amount of the ortho isomer and para isomer predominates.

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.

the answer is yes

it has kinetic energy

reason

an object has kinetic energy when you stop the force carrying it, the object will stay in motion.

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