Propanal and butanal can produce four different aldol condensation products. The possible structures are:
1. | ![]() |
2. | ![]() |
3. | Both (1) and (2) |
4. | None of these |
1. Low electrophilicity in 2,2,6-trimethylcyclohexanone
2. Less steric crowd in 2,2,6-trimethylcyclohexanone
3. More steric crowd in 2,2,6-trimethylcyclohexanone
4. High electrophilicity in 2,2,6-trimethylcyclohexanone
There is only one –NH2 group involved in semicarbazone formation out of two –NH2 group. It is due to:
1. Resonance of one type of –NH2 group
2. Inductive effect of one type of –NH2 group
3. Hyperconjugation of one type of –NH2 group
4. Reverse hyperconjugation of one type of -NH2 group
What type of reaction is demonstrated by the process involving a carboxylic acid, an alcohol, and an acid that results in the formation of esters?
1. Reversible slow process
2. Irreversible fast process
3. Cyclic process
4. Adiabatic process
The below reaction is an example of
\(CH_{3}CH_{2}OH \ + \ CH_{3}COCl \xrightarrow[]{\textbf{Pyridine}} \)
\( CH_{3}COOC_{2}H_{5} \ + \ HCl\)
1. Acetylation
2. Benzoylation
3. Cross aldol condensation
4. Cross Cannizzaro reaction
The correct sequence of reagents used for the preparation of
Methyl benzoate from benzene is -
1. a = Br2 / FeBr3 ; b = Mg/ Dry ether ; c = CO2 ; H3O+ ; d = Excess methanol conc. H+ Heat
2. a = Mg/ Dry ether ; b = Br2 / FeBr3 ; c = CO2 ; H3O+ ; d = Excess methanol conc. H+ Heat
3. a = CO2 ; H3O+ ; b = Br2 / FeBr3 ; c = Mg/ Dry ether ; d = Excess methanol conc. H+Heat
4. a = Excess methanol conc. H+ Heat ; b = Br2 / FeBr3 ; c = Mg/ Dry ether ; d = CO2 ; H3O+
(a) | Mg/ Dry ether |
(b) | Br2 / FeBr3 |
(c) | CO2 ; H3O+ |
(d) | HNO3 + H2SO4 |
1. | (a) | (b) | (c) | (d) |
2. | (b) | (a) | (c) | (d) |
3. | (c) | (b) | (a) | (d) |
4. | (d) | (b) | (a) | (c) |
The correct sequence of reagents used for the preparation of Phenylacetic acid from benzene are :
1. | a= NBS, hv, and heat; b= CH3Cl/Anhyd.AlCl3; C= KMnO4+KOH; d=H3O+ |
2. | a= CH3Cl/Anhyd.AlCl3; b= KMnO4+KOH; C= NBS, hv, and heat; d=H3O+ |
3. | a= CH3Cl/Anhyd.AlCl3; b= NBS, hv, and heat; C= H3O+; d=KMnO4+KOH |
4. | a= CH3Cl/Anhyd.AlCl3; b= NBS, hv, and heat; C= alc.KCN; d=H |
The correct sequence of reagents used to yield p-Nitrobenzaldehyde from benzene is:
(a) | CH3Cl /Anhyd. AlCl3 |
(b) | HNO3 /H2SO4 |
(c) | CS2 / CrO2Cl2 |
(d) | H3O+ |
1. | (a) | (b) | (c) | (d) |
2. | (c) | (b) | (a) | (d) |
3. | (b) | (a) | (c) | (d) |
4. | (a) | (b) | (d) | (c) |
Chemical test(s) to distinguish between the Propanal and Propanone is :
1. | Tollen’s test
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2. | Fehling’s test
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3. | Iodoform test
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4. | All of these |