`6.` 

`PTHH` `:` $C_{6}$$H_{5}$$CH_{3}$ `+` $2KMnO_{4}$ $\xrightarrow[]{ to }$ $C_{6}$$H_{5}$$COOK$ `+` $KOH_{}$ `+` $2MnO_{2}$`↓` `+` $H_{2}$`O` 

`7.` Styrene `:` $C_{6}$$H_{5}$`-` $CH_{}$`=` $CH_{2}$ 

`-` `+` $H_{2}$`O` `:`

$C_{6}$$H_{5}$`-` $CH_{}$`=` $CH_{2}$  `+` $H_{2}$`O` $\xrightarrow[acid]{ to }$ $C_{6}$$H_{5}$`CH``(OH)`$CH_{3}$ 

`-` `+` $KMnO_{4}$ `:`

$C_{6}$$H_{5}$`-` $CH_{}$`=` $CH_{2}$ `+` $10KMnO_{4}$ `->` $3C_{6}$$H_{5}$$COOK$ `+` $3K_{2}$$CO_{3}$ `+` $10MnO_{2}$`↓` `+` $4H_{2}$`O` `+` $KOH_{}$