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What is Rinne’s test was negative in the right ear. Possible diagnosis is and explain in detail?
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.