Aldehydes that do not undergo aldol condensation are
1.propanal
2.Trichloroethane
3. methanal
4. benzaldehyde
3 and 4 only
1,2and 3 only
3 and 4 only
2,3 and 4 only
D.
2,3 and 4 only
The carbonyl compounds must contain an α-hydrogen atom to undergo aldol condensation. Thus, propanal and ethanal are the aldehydes that can undergo aldol condensation. However, methanal though does not contain α-hydrogen atom yet undergoes cross aldol condensation in the presence of limewater. Thus, aldehydes that do not undergo aldol condensation are trichloroethanal, benzaldehyde and methanal.
Which compound among the following give/s positive iodoform test?
1. Ethanol
2. Ethanal
3. 1-butanol
4. 2-butanol
1,2 and 4
1, 3 and 4
1, 2 and 3
1 and 2
The hydroxyl compound that gives a precipitate immediately when treated with concentrated hydrochloric acid and anhydrous zinc chloride is
3-methyl-2-butanol
3-methyl-1-butanol
1-butanol
2-methyl-2-butanol
Which set of term correctly identifies the carbohydrate show?
1.Pentose
2. Hexose
3. Aldose
4. Ketose
5. Pyranose
6. Furanose
1, 3 and 6
1, 3, and 5
2, 3 and 5
2, 3 and 6
Which of the following is a better reducing agent for the following reduction ?
RCOOH → RCH2OH
SnCl2/HCl
NaBH4/ ether
B2H6/ H3O+
H2/ Pd
The IUPAC name of the compound is :
HOOC–CH2–CH(COOH)–CH2-CH2-COOH
2(carboxymethyl)-pentane-1, 5-dioic acid
3-carboxyhexane-1, 6-dioic acid
butane-1, 2, 4-tricarboxylic acid
4-carboxyhexane-1, 6-dioic acid
The reagent with which both acetaldehyde and acetophenone react easily are :
2, 4-dinitrophenylhydrazine
Fehling's solution
Schiff's reagent
Tollen's reagent
Aniline first reacts with acetyl chloride producing compound' A'. 'A' reacts with nitric acid/ sulphuric acid mixture and produces compound 'B', which hydrolyses to compound 'C'. What is the identity of 'C' ?
Acetanilide
p-nitroacetanilide
p-nitroaniline
Aniline