The electrophile involved in the above reaction is:
1. Dichloromethyl cation ($\stackrel{\oplus }{\mathrm{C}}{\mathrm{HCl}}_2$)
2. Dichlorocarbene (:CCl₂)
3. Trichloromethyl anion ($\stackrel{⊝}{\mathrm{C}}{\mathrm{Cl}}_3$)
4. Formyl cation ($\stackrel{\oplus }{\mathrm{C}}\mathrm{HO}$)

Phenol is weakly acidic but does not react with NaHCO₃ like carboxylic acids hence:-

1. phenol is weaker than carbonic acid

2. phenol is stronger than carbonic acid

3. phenol is stronger than carboxylic acid

4. none of the above

An unknown alcohol is treated with the “Lucas reagent” to determine whether the alcohol is primary, secondary or tertiary. Which alcohol reacts the fastest and by what mechanism:

1. secondary alcohol by S_N²

2. tertiary alcohol by S_N²

3. secondary alcohol by S_N¹

4. tertiary alcohol by S_N¹

A characteristic group test for phenolic gp. is:

1. Liebermann's nitroso reaction

2. coupling with diazonium salt

3. aqueous FeCl3

4. all of the above

Which of the following reagents may be used to distinguish between phenol and benzoic acid?

1. Aqueous NaOH

2. Tollens reagent

3. Molisch reagent

4. Neutral FeCl₃

An organic compound C₇H₈O is neither soluble in NaOH nor gives blue colour with FeCl₃, is:

(1) C₆H₅.CH₂OH                 

(2) ${\mathrm{C}}_6{\mathrm{H}}_4{<}_{\mathrm{OH}}^{{\mathrm{CH}}_3}$

(3) C₆H₅.OCH₃                   

(4) none of these

Phenol can be converted into salicylic acid by

1. Etard's reaction

2. Kolbe's reaction

3. Phenol with CCl₄ in basic medium

4. both (2) and (3) 

Resorcinol and conc. H₂SO₄ in presence of phthalic anhydride produce a compound which is:

1. a dye                             

2. an antiseptic

3. an indicator                   

4. a detergent

In the given transformation, which of the following is the most appropriate reagent ?

(1) Zn-Hg/HCl

(2) Na, Liq. NH₃

(3) NaBH₄

(4) NH₂NH₂,OH