Which of the following statements is not correct?

Answer: Option B

$$\begin{array}{rl}& \text{A = Since lo}{\text{g}}_{a}a=1,\text{ so lo}{\text{g}}_{10}10=1\\ & \\ & B=\text{log}\left(2+3\right)=5\\ & \text{and log}\left(2\times 3\right)=\text{log}6\\ & =\text{log}2+\text{log}3\\ & \therefore \text{log}\left(2+3\right)\ne \text{log}\left(2\times 3\right).\\ & \\ & C=\text{ Since lo}{\text{g}}_{a}1=0,so\text{ lo}{\text{g}}_{10}1=0.\\ & \\ & \text{D = log}\left(1+2+3\right)=\text{ log}6\\ & =\text{ log}\left(1\times 2\times 3\right)\\ & =\text{ log}1+\text{ log}2+\text{ log}3.\\ & \text{So (B) is incorrect}\end{array}$$