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BITSAT 2020
Exam
BITSAT
Year
2020
Subject
Chemistry
Chapter
Alcohols Phenols and Ethers

BITSAT 2020 · Chemistry · Alcohols Phenols and Ethers

On reaction with sodium, 1 mol of a compound X gives 1 ~mol of H_ 2...

On reaction with sodium, 1 mol of a compound X\mathrm{X} gives 1 mol1 \mathrm{~mol} of H2.\mathrm{H}_{2} . Which one of the following compounds might be X?X ?

Options

  1. ACH3CH2\mathrm{CH}_{3} \mathrm{CH}_{2}\mathrm{CH}=\mathrm{CH}2_{2}
  2. BCH3COOCH2CH3\mathrm{CH}_{3} \mathrm{COOCH}_{2} \mathrm{CH}_{3}
  3. CCH3CH2CH2OH\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{OH}
  4. DCH2(OH)CH2CH2CH2OH\mathrm{CH}_{2}(\mathrm{OH}) \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{OH}

Correct answer

D. CH2(OH)CH2CH2CH2OH\mathrm{CH}_{2}(\mathrm{OH}) \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{OH}

Step-by-step solution

Since 1 mole of compound Xreacts with Na to evolve 1 mole of H2\mathrm{H}_{2} gas, therefore the compound should have 2 active hydrogen atoms per mole which is possible only in option dd. CH2OHCH2CH2CH2OH+2Na⟶NaOCH2CH2CH2CH2ONa+2H\begin{array}{l} \mathrm{CH}_{2} \mathrm{OHCH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{OH}+2 \mathrm{Na} \\ \longrightarrow \mathrm{NaOCH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{ONa}+2 \mathrm{H} \end{array}
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