Question
For the following reaction scheme, percentage yields are given along the arrow: x g and y g are mass of R and U , respectively. (Use: Molar mass (in g mol ^ -1 ) of H , C and O as 1,12 and 16 , respectively) The value of y is ___.
JEE Advanced
Chemistry
Some Basic Concepts of Chemistry
2021
JEE Advanced 2021 (Paper 1)
JEE Advanced Chemistry Question (2021) — Solution
Options
- A. A
- B. B
- C. C
- D. D
Answer
A. A
Step-by-step solution
Mg 2 C 3 → H 2 O Mg ( OH ) 2 + C 3 H 4 ( P ) Propyne   ( 4 g ) CH 3 − C ≡ CH → 33 K ( 100 % ) Hg 2 + CH 3 − C | | O − CH 3 ( S ) Now, one moe of propyne give one mole of acetone. 100 % . one mole of acetone give 0 . 5 moles of α , β -unsaturated compound 100 %   yield . But given that 80 % yield. No. of moles of α , β -unsaturated compound = 0 .04   mol . = 0 .04   mol of T can give = 0 .04   mol of U 100 %   yield . But given that 80 % yield. No. of moles of U formed = 0 . 032 mass of U formed 0.032 × 100 = 3 . 20
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