of XII U12-Carbonyl XII U12-Carbonyl - - - - a) but – - enoicacid b) but – - ene- -oicacid c) but – - ene- -oic acid d) but - -ene- -oicacid . Identify the product formed in the reaction N H C H ONa a) b) NH C) O - C H d) . In which case chiral carbon is not generated by reaction with HCN a) b) C) d) Ph Ph . Assertion : p – N, N – dimethyl aminobenzaldehyde undergoes benzoin condensation Reason : The aldehydic (-CHO) group is meta directing a) if both assertion and reason are true and reason is the correct explanation of assertion.
b) if both assertion and reason are true but reason is not the correct explanation of assertion. c) assertion is true but reason is false d) both assertion and reason are false. . Which one of the following reaction is an example of disproportionation reaction a) Aldol condensation b) cannizaro reaction c) Benzoin condensation d) none of these .
Which one of the following undergoes reaction with % sodium hydroxide solution to give the corresponding alcohol and acid a) Phenylmethanal b) ethanal c) ethanol d) methanol XII U12-Carbonyl XII U12-Carbonyl - - - - . The reagent used to distinguish between acetaldehyde and benzaldehyde is a) Tollens reagent b) Fehling’s solution c) , – dinitrophenyl hydrazine d) semicarbazide . Phenyl methanal is reacted with concentrated NaOH to give two products X and Y. X reacts with metallic sodium to liberate hydrogen X and Y are a) sodiumbenzoate and phenol b) Sodium benzoate and phenyl methanol c) phenyl methanol and sodium benzoate d) none of these .
In which of the following reactions new carbon – carbon bond is not formed? a) Aldol condensation b) Friedel craft reaction c) Kolbe’s reaction d) Wolf kishner reduction . An alkene “A” on reaction with O and Zn - H O gives propanone and ethanal in equimolar ratio. Addition of HCl to alkene “A” gives “B” as the major