If you don't have a decent website with some serious organic traffic why do you want an Adsense account?
First improve your website, make sure you comply with all Adsense guidelines, follow best SEO practices and then you'll be ready to monetize your website.
Actually i want to buy some websites,do investement in them so before that i want my adsense to get verified.
Yes you can say to buy website first then verify with that,but still i want to get things ready before starting this.