Reimer-Tiemann reaction introduces an aldehyde group on to the aromatic ring of phenol, ortho to the hydroxyl group. This reacrtion involves electrophilic aromatic subsititution. It is a general method for the synthesis of subsituted salicyladehydes as depiced below:
Which one of the following reagents is used in the above reaction ?
A. aq. `NaOH+CH_(3)Cl`
B. aq. `NaOH+CH_(2)Cl_(2)`
C. aq. `NaOH+CHCl_(3)`
D. aq. `NaOH+C Cl_(4)`