Question

Which of the following statements is not true for halogens?

• A. All but fluorine show positive oxidation states
  
• B. All are oxidizing agents
  
• C. All form monobasic oxyacids
• D. Chlorine has the highest electron-gain enthalpy

Answer 1

The correct option is A All but fluorine show positive oxidation states


Due to fluorine's high electronegativity and small size, it forms only one oxoacid, $HOF$. The oxidation number of $F$ is +1 in $HOF$.