In the following question two statements (Assertion) $\mathrm{A}$ and Reason (R) are given Mark
(a) if $\mathrm{A}$ and $\mathrm{R}$ both are correct and $\mathrm{R}$ is the correct explanation of $\mathrm{A}$;
(b) if $\mathrm{A}$ and $\mathrm{R}$ both are correct but $\mathrm{R}$ is not the correct explanation of $\mathrm{A}$;
(c) $\mathrm{A}$ is true but $\mathrm{R}$ is false;
(d) $\mathrm{A}$ is false but $\mathrm{R}$ is true,
(e) $\mathrm{A}$ and $\mathrm{R}$ both are false.
(A): In $\alpha, \beta$ unsaturated compounds with C $=1$, and $\mathrm{C}=\mathrm{O}$ conjugated, attack of nucleophile takes place on $\mathrm{C}=\mathrm{C}$.
(R): The $\mathrm{C}=\mathrm{O}$ bond is stronger than $\mathrm{C}=\mathrm{C}$.