For each of the following amines (A through D), exhaustive methylation (treatment with excess methyl iodide), followed by Hoffmann elimination (heating with AgOH), repeated as necessaJy, removes the nitrogen atom in the form oftrimethylamine. Indicate the numberof repetitive Hoffmann eliminations required to remove the nitrogen by a number (1 to 4) in the designated answer sheet.

Explanation

Number of C-N bond is equal to number of Hoffmann exhaustive elimination.