Sodium 3,4-dimethoxybenzoate, reaction with

C) 4 -lodobutyl-3,4-Dimethoxybenzoate 32.5 g of 4 -chlorobutyl-3,4-dimethoxybenzoate and 19.5 g of sodium iodide (10% excess) were boiled in 150 ml of methyl ethyl ketone for 2.5 hours after cooling and filtering off the sodium chloride produced, the reaction was found not to be entirely completed boiling was then continued for another two hours the reaction mixture was cooled, and the solid filtered off and washed with 2 x 100 ml of ether. 

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