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Hi Mayank, Use the fetch tool listed above to see what URL's are being blocked. If any, it maybe it is just taking Google some time to get things indexed for you.

Absolutely, many sites go through a total re-branding. The history of the site and probably the existing back links will get the site going rather fast, providing the site has not been penalised or anything like that in the past or suspect link building. Make sure you create a good sitemap and have a good 404 page setup for all pages that no longer exist. be sure to remove all the pages that you no longer want/need. Take advantage of some of the existing pages on the site if possible, the history and any links to those pages will be a good start for those pages. Also look at the possibility of 301 redirecting any pages that have pagerank or links coming to them to related new pages that you create.

Why not keep leave the old page alive in the hopes that some will click on their links? Use a 304 redirect to your new site. We have hundreds of audiobook titles that have gone out-of-publication. For those who may come upon the original page while searching the web and click on the link we use a 304 redirect to this common page: http://www.audiobooksonline.com/out-of-publication-audio-books-book-audiobook-audiobooks.html