The major product of the following reaction,if it occurs by $S_N2$ mechanism is :

Which of the following gives the highest yield of $2$-pentene upon reaction with $C_2H_5ONa/C_2H_5OH$?

$A$ compound $X$ on heating with alcoholic $AgNO_3$ gives a white precipitate. Oxidation of $X$ gives an acid with the formula $C_8H_6O_4$,which easily forms a cyclic anhydride on heating. The compound $X$ is

Which of the following reactions will give Hoffmann alkene as a major product?

Which one of the following chlorohydrocarbons readily undergoes solvolysis?

The major product '$Y$' in the following reaction is