what's the name of this org. compound. RR'-C=NNH2
The (now deleted) answer by NotCorey has already explained that the compound that is shown in the picture is a hydrazone that is derived from acetone (propan-2-one).

According to the current version of Nomenclature of Organic Chemistry – IUPAC Recommendations and Preferred Names 2013 (Blue Book), the preferred IUPAC name (PIN) for a hydrazone is generated substitutively as ‘ylidene’ derivatives of hydrazine rather than by functional class nomenclature as in previous recommendations.


  P-68.3.1.2.2 Hydrazones
  
  Compounds having the general structure $\ce{RCH=N-NH2}$ or $\ce{RR'C=N-NH2}$ are called ‘hydrazones’ and are named in two ways:
  
  (1) substitutively as derivatives of the parent hydride ‘hydrazine’, $\ce{H2N-NH2}$;
  
  (2) by functional class nomenclature using the class name ‘hydrazone’.
  
  Method (1) generates preferred IUPAC names.


Therefore, the PIN for the compound that is given in the question is (propan-2-ylidene)hydrazine.