Is there a difference between mole ratio and molar ratios?

Which of these conditions most likely produces an unstable isotope?

Is this correct if not can u correct me

Pinene is an unsaturated hydrocarbon found in pine resin. if pinene has m+ = 136 and contains 1 double bond(s) and 2 ring(s); what is its molecular formula? enter the formula in the form ch first, then all other atoms in alphabetical order; do not use subscripts. the formula is case-sensitive