Aldehydes, Ketones and Carboxylic Acids · Question 21

The compound A, C8H8O2 reacts with acetophenone to form a single product via cross-Aldol condensation. The compound A on reaction with conc. NaOH forms a substituted benzyl alcohol as one of the two products. The compound A is :

1. 2-hydroxy acetophenone
2. 4-hydroxy benzaldehyde
3. 4-methyl benzoic acid
4. 4-methoxy benzaldehyde

An organic compound "P" of molecular formula C6H12O3 gives positive iodoform test but negative Tollens' test. When "P" is treated with dilute acid, it produces "Q". "Q" gives positive Tollens' test and also iodoform test. The structure of "P" is :

1. H- O \|C-CH2-CH2- OCH3 |CH-OCH3
2. CH3- O \|C- OCH3 |CH- OCH3 |CH2
3. CH3- O \|C-CH2- OCH3 |CH-OCH3
4. CH3- O \|C- OCH3 | OCH3 |C-CH3

Match List - I with List - II. Choose the correct answer from the options given below :

1. A-II, B-III, C-IV, D-I
2. A-IV, B-III, C-I, D-II
3. A-IV, B-I, C-II, D-III
4. A-II, B-IV, C-I, D-III

A [(ii) H3O+](i) NaOH B [(ii) H2SO4, ](i) EtOH C 'A' shows positive Lassaigne's test for N and its molar mass is 121. 'B' gives effervescence with aq NaHCO3. 'C' gives fruity smell. Identify A, B and C from the following.

1. [figure]
2. [figure]
3. [figure]
4. [figure]

When [figure] undergoes intramolecular aldol condensation, the major product formed is :

1. [figure]
2. [figure]
3. [figure]
4. [figure]

Which of the following compounds is least likely to give effervescence of CO2 in presence of aq. NaHCO3?

1. Ph- NH3 Cl
2. [figure]
3. [figure]
4. [figure]

"P" is an optically active compound with molecular formula C6H12O. When "P" is treated with 2,4-dinitrophenylhydrazine, it gives a positive test. However, in presence of Tollens' reagent, "P" gives a negative test. Predict the structure of "P".

1. [figure]
2. [figure]
3. [figure]
4. [figure]

Aldol condensation is a popular and classical method to prepare , -unsaturated carbonyl compounds. This reaction can be both intermolecular and intramolecular. Predict which one of the following is not a product of intramolecular aldol condensation?

1. [figure]
2. [figure]
3. [figure]
4. [figure]

Which among the following compounds give yellow solid when reacted with NaOI/NaOH? Choose the correct answer from the options given below :

1. (A) and (C) Only
2. (C) and (D) Only
3. (B), (C) and (E) Only
4. (A), (C) and (D) Only

Number of molecules from below which cannot give iodoform reaction is : Ethanol, Isopropyl alcohol, Bromoacetone, 2-Butanol, 2-Butanone, Butanal, 2-Pentanone, 3-Pentanone, Pentanal and 3-Pentanol.

1. 4
2. 3
3. 5
4. 2