Sodium ethoxide is a specific reagent for

Identify the major product formed from the following reaction: $1$-methylcyclohex-$1$-ene $\xrightarrow[(ii) AgNO_2]{(i) HCl} ?$

Correct reactivity order of alkyl halide towards dehydrohalogenation-

$CH_3-CH_2-Br + Nu^{\Theta} \rightarrow CH_3-CH_2-Nu + Br^{\Theta}$
The decreasing order of the reaction rate with nucleophile $Nu^{\Theta}$ is $Nu^{\Theta} = (I) PhO^{\Theta}; (II) CH_3COO^{\Theta}; (III) OH^{\Theta}; (IV) CH_3O^{\Theta}$

Which one of the following will be most reactive for $SN^1$ reaction?

Which of the following alkyl halides is most reactive towards substitution by the $S_{N}1$ mechanism?