[stephanopolous]

Hi,

In the attachment I drew the full mechanism of the first addition + elemination.
I didn't draw the hydrolisis of the nitrile group, but you can look that up in your book (well known reaction).
Hope it helps.

Thank you very much!!!

[stephanopolous]

So in summary of that lot:
The first product is still a nitrile.
The acid hydrolyses it to the carboxylic acid and causes the elimination of water to give the product you drew.

Thanks so much for all your help

[orgopete]

I don't think that C₉H₇N is correct.

Seems right to me. It is the reactants minus H2O.