The structure of $(B)$ is

Toluene (excess) undergoes the following sequence of reactions:
$(i)$ $CrO_2Cl_2, CS_2$
(ii) $H_3O^+$
(iii) $NaHSO_3$
After filtration,a residue $(A)$ is obtained. This residue $(A)$ reacts with $dil. \ HCl$ to form compound $(B)$.
Identify the structures of residue $(A)$ and compound $(B)$ respectively.

Which of the following reactions represents Clemmensen reduction?

The haloform test is given by which of the following substances?

Which of the following does not give an aldol reaction with dil. $NaOH$?

To carry out the following conversion,arrange the reagents in the correct order:
$O_3/Zn$ $(1)$
$EtONa/EtOH/\Delta$ $(2)$
$NaOCl$ $(3)$
$H^{+}$ $(4)$