Which of the following molecule gives positive 2,4-DNP test, negative Tollen's test, negative Fehling's test, positive Iodoform test and can undergo aldol condensation reaction

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$HCHO$

${CH}_{3} - CHO$

${CH}_{3} - CO - {CH}_{3}$

$C_{6} H_{5} - CHO$

answer is C.

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Detailed Solution

HCHO…….no $α$ -hydrogen……undergoes Cannizzaro reaction……cannot undergo aldol condensation…positive 2,4-DNP test….positive Tollen's test……..positive Fehling's test…….negative Iodoform test ;

CH₃CHO…….contains $α$ -hydrogen……cannot undergo Cannizzaro reaction…. undergoes aldol condensation…positive 2,4-DNP test….positive Tollen's test……positive Fehling's test…….positive Iodoform test ;

CH₃-CO-CH₃…….contains $α$ -hydrogen……cannot undergo Cannizzaro reaction…. undergoes aldol condensation…positive 2,4-DNP test….negative Tollen's test……negative Fehling's test…….positive Iodoform test ;

C₆H₅-CHO…….no $α$ -hydrogen……undergoes Cannizzaro reaction……cannot undergo aldol condensation…positive 2,4-DNP test….positive Tollen's test……..negative Fehling's test…….negative Iodoform test ;

Aromatic aldehydes are less reactive than aliphatic aldehydes……cannot reduce Fehling's and Benedict’s test ;

Aldehydes and Ketones containing -COCH₃ group give yellow crystals of CHI₃(positive haloform test) with Alkali (NaOH, KOH, Ca(OH)₂, Na₂CO₃)+Halogen(X₂…generally iodine) (or) NaOX, CaOCl₂;

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