The product of the reaction $image \xrightarrow[{HCl}]{{NaNO_2}} (A)$ is:

Which of the following does not have intermolecular hydrogen bonding?

Rank the following in decreasing order of their acidic strengths:
$(A)$ Tetrahydrofuran-oxonium ion
$(B)$ Pyrrolidine
$(C)$ Cyclopentanol
$(D)$ $N$-methylpyrrolidinium ion

Which of the following compounds acts as the strongest base in its aqueous solution?

Which of the following substances turns blue litmus red?

In the following reaction,
$C_6H_5NHCOC_6H_5 \xrightarrow[conc. \ H_2SO_4]{conc. \ HNO_3} X$
the structure of the major product $X$ is