MCQ
$(A)$ & $(B)$ are isomers. Product $(B)$ is :Dewar's Benzene


- ✓

- B

- C

- D








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(image) $\xrightarrow[{KOH}]{{KMn{O_4}}}\,B\,\xrightarrow[{FeC{L_3}}]{{B{r_2}}}\,C\,\xrightarrow[{{H^ + }}]{{{C_2}{H_5}OH}}\,D$
$D$ would be
when attached to $sp^3$ hybridised carbon, their leaving group ability in nucleophilic substitution reaction decrease in the order.