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Question:

Complete hydrolysis of starch gives:

glucose and galactose in equimolar amounts

galactose and fructose in equimolar amounts

glucose and fructose in equimolar amount

glucose only

Solution:

Starch is a polymer of α-D-glucopyranose. Complete hydrolysis of starch gives glucose only (C₆H₁₀O₅)ₙstarch + nH₂O dilH₂SO₄−−−−−−−−−−−→393K,2atm nC₆H₁₂O₆glucose