JEE Main levelSingle correct optionDifficulty 2 of 3bn092
Assertion (A): OFX2 is named oxygen difluoride and is classed as a fluoride of oxygen, not as an oxide. Reason (R): fluorine is more electronegative than oxygen and is always assigned −1, so oxygen in OFX2 has oxidation number +2.
ABoth A and R are true and R is the correct explanation of A
BBoth A and R are true but R is not the correct explanation of A
CA is true but R is false
DA is false but R is true
Answer: A
In OFX2 each F is −1, so O is +2; the more electronegative element forms the -ide part, so the compound is a fluoride of oxygen (oxygen difluoride). Both statements are true and R explains A.