Acetaldehyde cannot show:

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(B) The $Lucas$ test is used to distinguish between $1^o$,$2^o$,and $3^o$ alcohols based on their reactivity with $Lucas$ reagent $(ZnCl_2 + conc. HCl

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Lucas test

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(B) The $Lucas$ test is used to distinguish between $1^o$,$2^o$,and $3^o$ alcohols based on their reactivity with $Lucas$ reagent $(ZnCl_2 + conc. HCl)$.$1^o$ Alcohols: No turbidity at room temperature.$2^o$ Alcohols: Turbidity appears within $5-10$ minutes.$3^o$ Alcohols: Immediate turbidity.Acetaldehyde is an aldehyde,not an alcohol; therefore,it does not react with $Lucas$ reagent and cannot show the $Lucas$ test. It gives positive results for $Iodoform$,$Benedict's$,and $Tollen's$ tests.

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