Aldol condensation will not be observed in

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(A) Aldol condensation is observed only in carbonyl compounds (aldehydes and ketones) that possess at least one $\alpha$-hydrogen atom.$(a)$ Chloral $

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chloral

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(A) Aldol condensation is observed only in carbonyl compounds (aldehydes and ketones) that possess at least one $\alpha$-hydrogen atom.$(a)$ Chloral $(CCl_3CHO)$ has no $\alpha$-hydrogen atom because the $\alpha$-carbon is bonded to three chlorine atoms.$(b)$ Phenylacetaldehyde $(C_6H_5CH_2CHO)$ has two $\alpha$-hydrogen atoms.$(c)$ Hexanal $(CH_3(CH_2)_4CHO)$ has two $\alpha$-hydrogen atoms.$(d)$ Nitromethane $(CH_3NO_2)$ is not an aldehyde or ketone,but it does possess $\alpha$-hydrogen atoms and can undergo a condensation reaction similar to aldol,but strictly speaking,the question refers to carbonyl compounds. Among the options,chloral is the classic example that does not undergo aldol condensation.

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