JEE Main · 2026 · 06 Apr 2026 · Shift 1 · Alcohols Phenols and Ethers

4.7 g of phenol is heated with Zn to give product X. If this reaction goes to

60%

completion then the number of moles of compound X formed will be _____

\times 1 0^{- 2}

(Nearest Integer)
(Given molar mass in

g mol^{- 1}

: H: 1, C: 12, O: 16)

Answer: 3

Solution

Phenol vapour passed over heated zinc dust loses its

- OH

group and is reduced to benzene:

C_{6} H_{5} OH + Zn \to C_{6} H_{6} + ZnO .

Molar mass of phenol

= 6 (12) + 6 (1) + 16 = 94 g mo l^{- 1}

, so moles taken

= \frac{4.7}{94} = 0.05 mol

.
The stoichiometry is

1 : 1

; at

60%

conversion the benzene formed is

0.05 \times 0.60 = 0.03 mol = 3 \times 1 0^{- 2} mol .

The number of moles of X formed is

3 \times 1 0^{- 2}

JEE Main · 2026 · 06 Apr 2026 · Shift 1 · Integer answer