Ethanol is heated with conc. H2SO4 at 443 K to give A. A reacts with Br2 in CCl4 to give B. B is heated with excess NaNH2 and then water is added to give C. C is treated with dilute H2SO4 and HgSO4 at 333 K to give D. D is

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Ethanol is heated with conc. $H X_{2} SO X_{4}$ at 443 K to give A. A reacts with $Br X_{2}$ in $CCl X_{4}$ to give B. B is heated with excess $NaNH X_{2}$ and then water is added to give C. C is treated with dilute $H X_{2} SO X_{4}$ and $HgSO X_{4}$ at 333 K to give D. D is

Aethanol
Bethanal
Cethanoic acid
Dethane-1,2-diol

Answer: B

A is ethene, B is 1,2-dibromoethane and C is ethyne (double dehydrohalogenation). Mercury(II)-catalysed hydration of ethyne gives the enol, which tautomerises to ethanal,

CH X_{3} CHO

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Ethanol is heated with conc. HX2​SOX4​ at 443 K to give A. A reacts with BrX2​ in CClX4​ to give B. B is heated with excess NaNHX2​ and then water is added to give C. C is treated with dilute HX2​SOX4​ and HgSOX4​ at 333 K to give D. D is

Answer: B

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Ethanol is heated with conc. $H X_{2} SO X_{4}$ at 443 K to give A. A reacts with $Br X_{2}$ in $CCl X_{4}$ to give B. B is heated with excess $NaNH X_{2}$ and then water is added to give C. C is treated with dilute $H X_{2} SO X_{4}$ and $HgSO X_{4}$ at 333 K to give D. D is