Question

An organic compound having carbon, hydrogen and sulphur contains $4$% of sulphur. The minimum molecular weight of the compound is:

• A. $200$
• B. $400$
• C. $600$
• D. $800$

Answer 1

The correct option is D $800$

The minimum m.wt. must contain at least one $S$ atom.
$\therefore$ % $S=\frac{weightofoneS-atom}{minimumm.wt.}\times 100$
$4=\frac{32}{minimumm.wt}\times 100$
minimum m.wt. $=\frac{32}{4}\times 100=800$