JEE Main · 2020 · 06 Sep 2020 · Shift 2 · Alcohols Phenols and Ethers

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A solution of phenol in chloroform when treated with aqueous NaOH gives compound P as a major product. The mass percentage of carbon in P is _____. (to the nearest integer) (Atomic mass: C=12; H=1; O=16)

Answer: 69

Solution

Phenol with chloroform and aqueous

NaOH

is the Reimer-Tiemann reaction, whose major product

P

is salicylaldehyde, 2-hydroxybenzaldehyde,

C X_{7} H X_{6} O X_{2}

. Its molar mass is

7 (12) + 6 (1) + 2 (16) = 122 g mol^{- 1}

, and the carbon fraction is

\frac{84}{122} \times 100 = 68.9%

, which rounds to

69

JEE Main · 2020 · 06 Sep 2020 · Shift 2 · Integer answer

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