B, by the chemical formula of the organic matter C6H6O, the molecule constituting the substance consists of 6 carbon atoms, 6 hydrogen atoms, 1 oxygen atom **** 13 atoms, and the organic matter is composed of molecules; therefore, the statement B is not correct;
C, the organic matter in the C, H, O elements of the mass ratio = (12 × 6): (1 × 6): 16 = 36: 3: 8, so which the hydrogen element has the smallest mass fraction; so the statement C is correct;
D, by the chemical formula of the organic matter, C6H6O, the molecule constituting the substance consists of 6 carbon atoms, 6 hydrogen atoms, 1 oxygen atom ****13 atoms, then the The ratio of the number of carbon and hydrogen atoms in the molecule of the organic substance is 1:1; therefore, statement D is correct;
Therefore, the choice of B.