$Me_2C = CH - CH_2 - CH_2 - Cl$ $\xrightarrow[CaCO_3]{H_2O} (X);$ What is the major product $(X)$ of the reaction?

Compound $A$ with molecular formula $C_4H_9Br$ is treated with aqueous $KOH$ solution. The rate of this reaction depends upon the concentration of compound $A$ only. When another optically active isomer $B$ of this compound was treated with aqueous $KOH$ solution,the rate of reaction was found to be dependent on the concentration of both the compound and $KOH$.
$(i)$ Write down the structural formula of both compounds $A$ and $B$.
$(ii)$ Out of these two compounds,which one will be converted to the product with inverted configuration?

Which of the following undergoes nucleophilic substitution by $S_N1$ mechanism?

What type of hybridisation is present in the carbocation formed during the alkaline hydrolysis of $1-$bromo$-1-$phenylethane?

Which is most reactive for $S_{N}2$ reaction?

Consider the given reaction: $CH_3-CH=CH-CH_2-OH \xrightarrow[S_N1]{HBr} [P]$. In the given reaction,the product $[P]$ is: