Rinne’s test was negative in the right ear. Possible diagnosis is
There is a conductive hearing loss in the right ear.
Left ear normal.  

A prediction of an air-bone gap can be made if tuning forks of 256, 512 and 1024 Hz are used.

A Rinne test equal or negative for 256 Hz but positive for 512 Hz indicates an air-bone gap of 20–30 dB.
A Rinne test negative for 256 and 512 Hz but positive for 1024 Hz indicates an air-bone gap of 30–45 dB.
A Rinne negative for all the three tuning forks of 256, 512 and 1024 Hz indicates an air-bone gap of 45–60 dB.
40 db SNHL in left ear, right ear normal
40 db CHL right ear, left ear normal
40 db CHL both ear
Profound hearing loss right ear, left ear normal