MCQ
The electrophile involved in the above reaction is


- ✓dichlorocarbene $(: CCl_2)$
- Btrichloromethyl anion $(\mathop C\limits^\Theta Cl_3)$
- Cformyl cation $(\mathop C\limits^ \oplus HO)$
- Ddichloromethyl cation $(\mathop C\limits^ + HCl_2)$

In Reimer-Tiemann reaction, phenol in presence of $NaOH$ reacts with chloroform to give salicyladehyde.
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Statement $II :$ As the size of the elements $\mathrm{F}, \mathrm{Cl}, \mathrm{Br}, \mathrm{I}$ increases down the group, the bond strength of $\mathrm{HF}$, HCl, HBr and HI decreases and so the acid strength increases.
In the light of the above statements, choose the correct answer from the options given below.
