MCQ
Ortho-dihydroxy benzene is
- ACarvacrol
- BResorcinol
- ✓Catechol
- DOrcinol

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(At. Nos. $Mn = 25, Cr = 24, V = 23, Ti = 22$ )
$(i)$ Manganese exhibits $+7$ oxidation state in its oxide.
$(ii)$ Ruthenium and Osmium exhibit $+8$ oxidation in their oxides.
$(iii)$ $Sc$ shows $+4$ oxidation state which is oxidizing in nature.
$(iv)$ $Cr$ shows oxidising nature in $+6$ oxidation state.