Which of the following alkenes,on oxidation by $KMnO_4$ in dil. $H_2SO_4$,forms adipic acid?

What is the first step of the addition reaction when $HBr$ is added to propene in the absence of peroxide?

The product obtained when $2-$methylpropan$-2-$ol is treated with alumina $(Al_2O_3)$ at $423 \ K$ is

The reaction conditions used for converting $1, 2$-dibromoethane to ethylene are:

The reaction of ethene with $Cl_2$ in a saturated solution of $KBr$ yields:

Select the incorrect option based on the given reactions:
Reaction $1$: Methylenecyclohexane + $dil. H_2SO_4 \rightarrow (P)$ (major product)
Reaction $2$: $1-$Methylcyclohexanol + $dil. H_2SO_4 \rightarrow (Q)$ (major product)