When wine is served in a restaurant, the waiter often allows the host (the person who pays the bill)to examine the cork and gives the host a small sample of the wine before serving to the other guests. The host then smells the cork, smells the wine, and finally tastes it.Wine that has turned bad often smells like vinegar.

Why do the host and waiter do such a thing instead of serving food to the ladies first (I know, that is sexist, but it happens.) like he/she would do for the rest of the food? Write a chemical equation for what is going on (don't worry about subscripts, just type them on the same line.). What type of reaction is this?