MCQ
How many resonance structures are there for anthracene ?


- A$6$
- B$5$
- ✓$4$
- D$2$


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Consider the following statements about borax :
$a.$ Each boron atom has four $B-O$ bonds
$b.$ Each boron atom has three $B-O$ bonds
$c.$ Two boron atoms have four $B-O$ bonds while other two have three $B-O$ bonds
$d.$ Each boron atom has one $-OH$ groups
Select correct statement(s) :

(Plank's const. $ h = 6. \times 10^{-34}\, Js\,;$ mass of electron $= 9.1091 \times 10^{-31}\, kg\,;$ charge of electron $e= 1.60210 \times 10^{-19}\, C\,;$ permittivity of vaccum $\in _0 = 8.854185 \times 10^{-12} \,kg^{-1} \,m^{-3} A^2$)