Question

Which from following statements is NOT correct regarding Hofmann's exhaustive alkylation?

• A. In this quaternary ammmonium salts are obtained.
• B. Two moles of alkylhalide when heated with one mole primary amine forms tetraalkyl ammonium halide.
• C. Depending on the quantity of alkyl halides treated with primary amine, the mixture of secondary and tertiary amines obtained.
• D. The reaction is carried out in presence of \(\text{NaHCO}_3\)

Hint:

Count how many alkyl groups a primary amine needs to become a quaternary salt.

Answer 1

The Correct Option is B

Step 1: Count alkyl groups:
$\text{RNH}_2$ to $\text{RNHR}'$ (1 mole of $\text{R}'\text{X}$), to $\text{RNR}'_2$ (2 moles), to $\text{RNR}'_3^+\text{X}^-$ (3 moles).

Step 2: Compare to the statement:
Statement B says that 2 moles are enough for the quaternary salt. They give only the tertiary stage, so B does not hold.
The other statements match the usual description of the reaction.

Final Answer:
The incorrect statement is B, option (B). \[ \boxed{\text{B}} \]