MCQ
Which of the following structures are aromatic in nature?


- A$A, B, C$ and $D$
- ✓Only $A$ and $B$
- COnly $A$ and $C$
- DOnly $B, C$ and $D$

$C , D$ is nonaromatic
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Reason : Transparent bead $(NaBO_2 + B_2O_3)$ forms coloured bead with coloured cation.
$2{H_2}O \rightleftharpoons {H_3}{O^ + } + O{H^ - }$ ,
the value of $\Delta {G^o}$ at $298\,K$ is approximately .......$kJ\,mol^{-1}$