The term Rutherford gave to the positively charged particles in the nucleus of an atom was/is Proton.
Hope this helps!
Rewrite the formula C=5/9(F-32) substituting 23 for C: 23=5/9(F-32), then multiply both sides by the reciprocal of 5/9.
(9/5)*(23)=(9/5)*5/9(F-32)
41.4=F-32; add 32 to both sides.
41.4+32=F-32+32
73.4=F
Option C coz it should be ( CNH4)2. Hope i cleared your doubt