How To Background Check If My Present Working Company Closed

hi,
pls clarify this situation.
1) candidate A is presently working in one small IT company named X ,this is the only one company candidate A is working so far, with no previous experience.
2) due to no projects or other reasons his small IT Company X closed.
3) after closing candidate A's company X, now candidate A is applied for new job at another company named y .
4) if suppose candidate A cleared all rounds of interview in company y .
5) then how company y verify candidate A working details etc.
means how they check candidate A work reference,company details and other information etc.
pls tell the procedure how the new company verify candidate A details in this case.

if the company X was legal then its members deatils and ceos or presidents details can find the by the registrar where the comapnies need to be registered as per companies act
from there you can generate further lead to check the employees reference

if the co. X was registered one as per the company's act then the details of the ceo, president or mds, or other members can be obtained throught he registrar. from there further references canbe generated to check the candidate's backround