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 $\mathbf{x}$ is ____.

JEE Advanced · 2021 · 03 Oct 2021 · Paper 1 · Some Basic Concepts of Chemistry

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

x

is ____.

Answer: 1.62

Solution

Mg₂C₃→propyne→(NaNH₂,MeI) 2-butyne→(red-hot Fe tube, trimerization 40%) hexamethylbenzene R; x=162×0.01=1.62 g. Source key 1.62.

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

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