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 ($\stackrel{\oplus }{\mathrm{C}}\mathrm{HO}$)

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

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

Sodium phenoxide when heated with CO₂ under pressure at 125°C yields a product which on acetylation produces C.

The major product C would be :

(1) 

(2) 

(3) 

(4) 

A compound with molecular formula C₄H₁₀O₃ is converted by the action of acetyl chloride to a compound with molar mass 190. The original compound has: 

(1) one OH group

(2) two OH groups

(3) three OH groups

(4) no OH group

Phenyl ethyl ether with concentrated hydrobromic acid on boiling yields:-

1. Phenol and ethyl bromide

2. Bromobenzene and ethanol

3. Phenol and ethane

4. Bromobenzene and ethane

An organic compound A reacts with sodium metal and forms B. On heating with conc. H₂SO₄, A gives diethyl ether. So A and B are:
1. C₃H₇OH and CH₃ONa
2. CH₃OH and CH₃ONa
3. C₄H₉OH and C₄H₉ONa
4. C₂H₅OH and C₂H₅ONa

Which will form two oximes with NH₂OH?

(1) CH₃COCH₃

(2) CH₃CH₂COCH₃

(3) CH₃CH₂COCH₂CH₃

(4) 

Identify A, X, Y and Z 

(1) A-methoxymethane, X-ethanoic acid, Y-acetate ion, Z-hydrazine

(2) A- methoxymethane, X-ethanol, Y-ethanoic acid, Z- semicarbazide

(3) A-Acetaldehyde, X-ethanol, Y-but-2-en-1-ol, Z- semicarbazone

(4) A-ethanol, X-acetaldehyde, Y-butanone, Z-hydrazone

Reaction of phenol with chloroform in the presence of dilute sodium hydroxide finally

introduces, which one of the following functional group?

1. -CH₂Cl                       

2. -COOH

3. -CHCl₂                       

4. -CHO