(A) The compound 2,5 dimethyl hexane contains 12(1oH),4(2oH),2(3oH) atoms.
(B) The compound 2 methyl pentane contains 9(1oH),4(2oH),1(3oH) atoms.
(C) The compound isobutane contains 9(1oH),2(2oH),1(3oH) atoms.
(D) The compound 2,4 dimethyl pentane contains 12(1oH),2(2oH),2(3oH) atoms.
(E) The compound 2 ethyl butane contains 9(1oH),4(2oH),1(3oH) atoms.