Dehydrohalogenation of an alkyl halide is a/an

Consider the following four reactions: $(I) C_6H_5-CHCl-CH_3 \xrightarrow{95\% \text{ acetone}, 5\% \text{ water}} C_6H_5-CH(OH)-CH_3$ $(II) C_6H_5-CHCl-CH_3 \xrightarrow{90\% \text{ acetone}, 10\% \text{ water}} C_6H_5-CH(OH)-CH_3$ $(III) C_6H_5-CHCl-CH_3 \xrightarrow{80\% \text{ acetone}, 20\% \text{ water}} C_6H_5-CH(OH)-CH_3$ $(IV) C_6H_5-CHCl-CH_3 \xrightarrow{100\% \text{ water}} C_6H_5-CH(OH)-CH_3$ Arrange these reactions in decreasing order of the proportion of inverted product and select the correct answer from the codes given below:

Which of the following would not give $2-$phenylbutane as the major product in a Friedel-Crafts alkylation reaction?

Toluene reacts with $Cl_2$ in the presence of .............. to form benzyl chloride.

Which of the following will react faster through the $S_N 1$ mechanism?

Identify the major product $Y$ in the given reaction sequence.