Yes. You will be accused on lying if you change to B2, promise to leave at the end of the authorized stay and then your new employer will seek a change of status for you from B2 to H1B again. This would be called playing games and misusing the visitor's visa. You do not want to do that, I am sure.
The information contained in this answer is provided for informational purposes only, and should not be construed as legal advice on any subject matter,not should it be viewed as establishing an attorney client relationship of any kind.
Yes! A denial of your COS to B2 will render you unable to change status to H-1B in the US. Make sure to immediately hire the best immigration attorney money can buy to deal with this RFE forthwith. You will otherwise be compelled to depart and seek consular processing of your H-1B if and when approved by USCIS. Depending where that consulate is, you could be slapped with "administrative processing" the euphemism for security name checks which can easily ground you at home for 7-8 months (think Hindustan or better yet, Pakistan). By the time the dust finally settles you "employer" might want you no more, don't you think?
Kindly be advised that the answer above is only general in nature cannot be construed as legal advice, given that not enough facts are known. It is your responsibility to retain a lawyer to analyze the facts specific to your particular situation in order to give you specific advice. Specific answers will require cognizance of all pertinent facts about your case. Any answers offered on Avvo are of a general nature only, and are not meant to create an attorney-client relationship.
You can use the B-2 as a bridge between jobs. The problem is that the change of status application will take months to be adjudicated. Assuming that you find another H-1B employer during the waiting period or if your change of status to B-2 is denied, you will have to go abroad to get an H-1B visa.
Mr. Shusterman's (former INS Trial Attorney, 1976-82) response to your question is general in nature, as not all the facts are known to him. You should retain an attorney experienced in immigration law to review all the facts in your case in order to receive advice specific to your case. Mr. Shusterman's statement above does not create an attorney/client relationship.
It would be best to hire a competent immigration attorney to respond to the RFE. A denial of your COS would potentially result into an overstay, as you are technically not in the H1B status once you lost your job or stopped getting paid. If your H1B is approved under premium processing, USCIS could either grant you a H1B transfer or also process it as a Consulate processing , in which case you would have to go back to your home country to receive the H1B visa. However if the H1B is denied, it would be best to leave the country rather than waiting for the B2 approval. Since it is filed in premium processing, you would know in 15 days from filing date as to the status of your new H1B filing, unless ofcourse if they issue an RFE in that case also.