Total number of RMgX are consumed in the following reaction
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Solution
(Refer to Image 1)
Reaction "a" i.e. methylation of alkylhalides needs 1equiv of RMgX. Reactions b,c and d need 1 equivalent, 2 equivalents and 2 equivalents of RMgX respectively. So total equivalents of RMgX=1+1+2+2+2=8 .