For the following reaction scheme, percentage yields are given along the arrow: $\mathbf{x}$ g and $\mathbf{y}$ g are mass of $\mathbf{R}$ and $\mathbf{U}$, respectively. (Use: Molar mass (in $\mathrm{g~mol}^{-1}$) of H, C and O as 1, 12 and 16, respectively) The value of $\mathbf{y}$ is ____.

JEE Advanced · 2021 · 03 Oct 2021 · Paper 1 · Chapter_pending

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 ____.

Answer: 3.2

Same scheme; U from Kucherov → aldol/haloform path. Source key lists 3.20 or 3.90-3.91 as acceptable. Stored value+acceptedValues match source.

JEE Advanced · 2021 · 03 Oct 2021 · Paper 1 · Numerical answer