The order of reactivities of methyl halide in the formation of Grignard reagent is

Question

The order of reactivities of methyl halide in the formation of Grignard reagent is (A)  CH3Cl > CH3 Br > CH3I  (B)  CH3 I > CH3 Br > CH3Cl  (C)  CH3Br > CH3 I > CH3Cl  (D)  CH3Br > CH3Cl > CH3 I

Tardigrade Admin · Accepted Answer

When an alkyl halide reacts with Mg metal in dry ether, as a solvent, in an atmosphere of nitrogen then alkyl magnesium halide is obtained. This is called Grignard reagent. RX+Mg xrightarrow textDry etherR-Mg-X The reactivity with respect to halide RI > RBr > RCl For a given halide the order is Allyl > alkyl (3° > 2° > 1° ) > aryl. The order of reactivity of methyl halide in the formation of Grignard reagent is as CH3I > CH3 Br > CH3Cl Here the alkyl group is same, therefore the reactivity depend on halides. The ease of the leaving group in alkyl halide is as -I > -Br > -Cl -F and the bond strength being in order C - F > C - Cl > C - Br > C - I. Therefore, the reactivity of methyl halide in the formation of Grignard reagent is as CH3I > CH3Br > CH3Cl

Q. The order of reactivities of methyl halide in the formation of Grignard reagent is

$C H_{3} Cl > C H_{3} B r > C H_{3} I$

$C H_{3} I > C H_{3} B r > C H_{3} Cl$

$C H_{3} B r > C H_{3} I > C H_{3} Cl$

$C H_{3} B r > C H_{3} Cl > C H_{3} I$

Q. The order of reactivities of methyl halide in the formation of Grignard reagent is

CH3​Cl>CH3​Br>CH3​I

CH3​I>CH3​Br>CH3​Cl

CH3​Br>CH3​I>CH3​Cl

CH3​Br>CH3​Cl>CH3​I

$C H_{3} Cl > C H_{3} B r > C H_{3} I$

$C H_{3} I > C H_{3} B r > C H_{3} Cl$

$C H_{3} B r > C H_{3} I > C H_{3} Cl$

$C H_{3} B r > C H_{3} Cl > C H_{3} I$