Pls answer as quick as possible pls.
Assertion: Elements and compounds are pure substances.
Reason: Properties of compounds are different from those of its constituent elements.i) Both A and R are true and R is the correct explanation of the assertion.
ii) Both A and R are true but R is not the correct explanation of the assertion.
iii)A is true but R is false.
iv)A is false but R is true.