A reaction of benzonitrile with one equivalent ${\mathrm{CH}}_3\mathrm{MgBr}$ followed by hydrolysis produces a yellow liquid "P". The compound "P" will give positive ________

Maleic anhydride

Maleic anhydride can be prepared by :

Consider the above reaction sequence, Product "A" and Product "B" formed respectively are:

Consider the given reaction, the product '$\mathrm{X}$' is:

${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{CH}={\mathrm{CH}}_2\underset{\mathrm{Rh} \mathrm{catalyst}}{\overset{{\mathrm{H}}_2/\mathrm{CO}}{\to }}$

The major product of the following chemical reaction is :

Which of the following reagent is suitable for the preparation of the product in the above reaction?