Due to we have total number of 6 carbons and one of them is the carboxylic group and we need to draw 2 methyl groups on the same carbon so the longest chain must be 4 carbons + 2 methyl branches and also these branches must be in carbon two and carbon three as follow:
To find moles from grams would be the amount of grams which in your case is 3.4 divided by the molar mass which is just adding ip Si, O2
Answer would be B. CNS the central nervous system
Explanation:
Bromothymol blue changes colour from blue to yellow due to the high carbon dioxide content being exhaled and dissolved in the solution.