Question

How many different aldol addition products can be formed in the reaction of equal amounts of propanal and butanal with aqueous sodium hydroxide at OC? (Consider only constitutional isomer - not stereoisomers.) C1 OOO QUESTION 2 Which of the following is the aldol addition product of butanal in the presence of sodium hydroxide and water? 2-ethyl-3-hydroxyhexanal C2-methyl-2-hydroxyheptanal C 3-ethyl-2-hydroxyhexanal C2-ethyl-2-hydroxyhexanal QUESTION 3 The reaction of benzophenone in a Aldol self-condensation reaction with sodium hydroxide and water gives which product? C 1,2-tetraphenyl-1,2-ethanediol No Reaction C2 moles of benzaldehyde C1-phenyl-2-triphenyl-1,2-ethane diol via rearrangment

Answer 1

AldoL condensation can be explined by the following mechanism E le 31 o oh K 11 R Y CH₂ work RLAR 11 a H₂O an eng 013 up The above mechanism is showing the aldal condensation when only one starting material is involved. The Last step leading to the formation of x, ß- unsaturated product is shown below o R R G CH3 - Caldol addition Saustion 1 product). When there is more than one starting matviral, then there is equal probability o sell aldol condensation and cross aldo L' Condensation. For the given question. O 2 jhr + coq. Naon or t ~ Dropanal - butanalo There are four producte possible 2 for self aldo condensations of propanal and butcanal. 2 for cross aldol condensations between the starting materials.

The structure of the products are obtained through the parevious mentioned mechanism for aldol condensation. Una o n.co 6 sey aldor pa aldol product ① self aldol product of propanal of bwanal CH3 CM UN o thu H₂C ® Cross aldol product of butanal Троратор uc Cuoss aldol product of propanal+ butanal addition products 1.4 different aldol are formed. Answer :4

LIO3 Question 2 The aldol addetion product of butanal in the presen of Naon and H₂O st МО

The the condensation product formed after - no of H₂o us ... utanal The aldol addition product of bul containing the hydroxy group us си о y cho Кои Answer! 2-ethyl-3-hydecony hesanal Question 3 The reaction of benzophenone with Naon and water a-carbon atom with respect to the Aye ketone group Benzophenone From the mechanism of aldol condensation, we can see that the presence of x-hydrogen atoms are necessary for aldo Laddition to take place. Since more does not have any a-Hydrogen present. So , no reaction take place. Answer: No Reaction