Question
Explain Cross aldol condensation with suitable example. ### Write a short note: Cross aldol condensation.
✓
Answer
→ Cross aldol condensation : "When aldol condensation is carried out between two diferite and/or ketones, it is called cross aldol condensation." If both of them contain $\alpha$-hydrogen atoms, it gives a mixture of four products. This is illustrated below by aldol reaction of a mixture of ethanal and propanal.
→ Ketones can also be used as one component in the cross aldol reactions.
→ Ketones can also be used as one component in the cross aldol reactions.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Determine the osmotic pressure of a solution prepared by dissolving 25 mg of K2SO4 in 2 litre of water at 25°C, assuming that it is completely dissociated.
Derive nernst equation for Daniel cell
The mole fraction of helium in a saturated solution at $20^\circ C$ is $1.2 g 10-6$ . Find the pressure of helium above the solution. Given Henry's constant at $20^\circ C$ is $144.97 k $ bar. $(2)$
→Conductivity of 0.00241 M acetic acid is $7.896 \times 10^{-5} s cm ^{-1}$. Calculate its molar conductivity. If $\Lambda_m{ }^o$ for acetic acid is 390.5 S cm2 mol-1. What is its dissociation constant?
→Describe the froth floatation process of concentration of ores.
(a) Out of the following pairs, predict with reason which pair will allow greater conduction electricity:
(i) Silver wire at $30^{\circ}C$ or silver wire at $60^{\circ}C.$
(ii) 0.1 M $CH_{3}COOH$ solution or 1 M $CH_{3}COOH$ solution.
(iii) KCl solution at $20^{\circ}C$ or KCl solution at $50^{\circ}C$.
(b) Give two points of differences between electrochemical and electrolytic cells.
→(i) Silver wire at $30^{\circ}C$ or silver wire at $60^{\circ}C.$
(ii) 0.1 M $CH_{3}COOH$ solution or 1 M $CH_{3}COOH$ solution.
(iii) KCl solution at $20^{\circ}C$ or KCl solution at $50^{\circ}C$.
(b) Give two points of differences between electrochemical and electrolytic cells.
Account for the following statements:
(i) Co(II) is stable in aqueous solution but in the presence of strong ligands and air it can get oxidised to Co(III).
(ii) $[Ni(CN)_{4}]^{2-}$ is square planar and diamagnetic whereas $[NiCl_{4}]^{2-}$ is tetrahedral and paramagnetic.
→(i) Co(II) is stable in aqueous solution but in the presence of strong ligands and air it can get oxidised to Co(III).
(ii) $[Ni(CN)_{4}]^{2-}$ is square planar and diamagnetic whereas $[NiCl_{4}]^{2-}$ is tetrahedral and paramagnetic.
Explain classification of Monohalogen compounds on the basis of $sp^3 (CX)$ bonds.
→Explain with equations, the nucleophilic addition reaction of aldehydes and ketones with alcohols. And also explain that why this reaction is carried out in the presence of dry hydrogen chloride ?
What happens when D-glucose is treated with the following reagents?
(i) HI , (ii) Bromine water, (iii) $HNO _3$.
→(i) HI , (ii) Bromine water, (iii) $HNO _3$.