Formic acid and acetic acid can be distinguished by

Grignard reagents do not give carbonyl compounds with :

Consider the acidity of the following carboxylic acids:
$(I)$ $PhCOOH$
$(II)$ $o-NO_2C_6H_4COOH$
$(III)$ $p-NO_2C_6H_4COOH$
$(IV)$ $m-NO_2C_6H_4COOH$
Which of the following is the correct order of acidity?

Among the given compounds,the most susceptible to nucleophilic attack at the carbonyl group is

Identify the major product $P$ in the following reaction:
$CH_2=C(OLi)-CH=C(OLi)OEt \xrightarrow[(ii) H_3O^+]{(i) CH_3CH_2I / THF} P$

When ethyl acetoacetate reacts with one mole of methyl magnesium iodide,the product of the reaction will be: