Ethyl benzoate reacts with $PCl_5$ to give

Which of the following is an intermediate formed in the reaction shown below?
$CH_3-C(=O)-Cl + NH_3 \to$ Intermediate $\to$ product

Oxalic acid reacts with concentrated $H_2SO_4$ to give a mixture of two gases. When this mixture is passed through caustic potash,one of the gases is absorbed. What is the product formed by the absorbed gas with caustic potash?

Which of the following has the maximum boiling point?

Among the following compounds, the one$(s)$ that give$(s)$ effervescence with aqueous $NaHCO_{3}$ solution is (are):
$I. (CH_{3}CO)_{2}O$
$II. CH_{3}COOH$
$III. PhOH$
$IV. CH_{3}COCHO$

What will be the product $D$ in the following reaction?
$CH_3Cl$ $\xrightarrow{KCN} (A)$ $\xrightarrow{H_3O^+} (B)$ $\xrightarrow{NH_3} (C)$ $\xrightarrow{\Delta} (D)$