One mole of ethyl benzoate and one mole of benzoyl chloride are mixed and treated with a large excess of CH3MgBr in dry ether, then H3O+. Assume each acyl compound is converted completely to the tertiary alkoxide, and ignore any Grignard lost to moisture. Find the total number of moles of CH3MgBr consumed.

JEE Main levelNumerical answerDifficulty 2 of 3o1198

One mole of ethyl benzoate and one mole of benzoyl chloride are mixed and treated with a large excess of $CH X_{3} MgBr$ in dry ether, then $H X_{3} O X^{+}$ . Assume each acyl compound is converted completely to the tertiary alkoxide, and ignore any Grignard lost to moisture. Find the total number of moles of $CH X_{3} MgBr$ consumed.

Numerical answer type, tolerance 0.5.

Each acyl compound adds one mole of

CH X_{3} MgBr

to give acetophenone, which then adds a second mole. Ester: 2 mol; acid chloride: 2 mol. Total

= 2 + 2 = 4

mol.