Can you please help me to work out the addreviated structural formulae of hydrolysis of tocainide?

Won't it be the -NH2 group that hydrolyzes?
ArNH2 + HOH ==> ArNH3^+ + OH^-

Check my thinking.

Thanks That is exactly what I thought it would be. Thanks again DrBob.

To work out the abbreviated structural formulae of the hydrolysis of tocainide, we need to start with the molecular formula of tocainide and consider the hydrolysis reaction you provided.

Tocainide has the molecular formula ArNH2, indicating that it consists of an aromatic group (Ar) attached to an amino group (NH2).

During hydrolysis, water (HOH) reacts with the amino group (NH2) to form an ammonium ion (ArNH3+) and a hydroxide ion (OH-), as you correctly stated:

ArNH2 + HOH → ArNH3+ + OH-

So, after the hydrolysis reaction, the structural formulae can be written as follows:

Tocainide (before hydrolysis): Ar-NH2

Tocainide (after hydrolysis): Ar-NH3+ + OH-

The hydrolysis results in the formation of an ammonium ion (ArNH3+), where the amino group (NH2) has gained a hydrogen ion (H+), and a hydroxide ion (OH-) is also produced.

I hope this helps! Let me know if you have any more questions.