$M$ is

Hardening of oil is done by

An alkene $(A)$ $C_{16}H_{16}$ on ozonolysis gives only one product $(B)$ $C_8H_8O$. $(B)$ can also be obtained by the hydrolysis of the product obtained from the reaction between cyanobenzene and $CH_3MgBr$. $(A)$ shows geometrical isomerism and decolourises $Br_2$ water. $(B)$ on treatment with $SeO_2$ produces $(C)$. Which statement is not correct about $(A)$?

Acid-catalyzed hydration of alkenes,except ethene,leads to the formation of:

The product of the following reaction: $CH_2=CH-CCl_3 + HBr$ is:

Electrolysis of an aqueous solution of .......... gives ethylene.