Aldehydes, Ketones and Carboxylic Acids

A reaction of benzonitrile with one equivalent CH?MgBr followed by hydrolysis produces a yellow liquid "P". The compound "P" will give positive

Which one of the following compounds will give orange precipitate when treated with 2,4-Dinitrophenyl hydrazine?

Consider the given reaction, the product 'X' is

[where Et → C?H?, t-Bu ⇒ (CH?)?C-]

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

Maleic anhydride
Maleic anhydride can be prepared by:

In the following sequence of reactions a compound A, (molecular formula C₆H₁₂O₂) with a straight chain structure gives a C4 caboxylic acid. A is

$A\underset{H_3{O}^{+}}{\overset{LiAI{H}_4}{\to }}B\underset{}{\overset{Oxidation}{\to }}{C}_4-carboxylicacid$

2,4-DNP test can be used to identify:

The product formed in the first step of the reaction of

Identify A in the following chemical reaction.