Burgundy mixture contains sodium carbonate in place of CaCO3 as in Bordeaux mixture was discovered in

Answer: Option B

Burgundy mixture contains sodium carbonate in place of CaCO₃ as in Bordeaux mixture was discovered in 1887.
Bordeaux mixture contains copper(II) sulfate, CuSO₄, and hydrated lime, Ca(OH)₂, while Burgundy mixture contains copper sulphate, CuSO₄, and sodium carbonate, Na₂CO₃.
Burgundy mixture, named after the French district where it was first used to treat grapes and vines, is a mixture of copper sulfate and sodium carbonate. This mixture, which can have an overall copper concentration within the range of 1% to 20%, is used as a fungicidal spray for trees and small fruits.