MHTCET 11 May 2024 Shift 1 Paper

Concept:Atom economy measures the efficiency of a reaction by comparing the formula weight of the desired product with the sum of the formula weights of all reactants.Explanation:Step 1: Write the formula for percentage atom economy.$$\% \text{ Atom economy} = \frac{\text{Formula weight of desired product}}{\text{Sum of formula weights of all reactants}} \times 100$$Step 2: Substitute the given values into the formula.$$\% \text{ Atom economy} = \frac{70 \, \text{u}}{140 \, \text{u}} \times 100$$Step 3: Simplify the fraction.$$\frac{70}{140} = 0.5$$Step 4: Multiply by 100 to get the percentage.$$0.5 \times 100 = 50\%$$Thus, the reaction shows 50% atom economy, meaning half of the reactant mass is converted into the desired product.Answer:The percentage atom economy is $50\%$, so the correct option is C.