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
Explain colour in coordination compounds.
Explain classification of Monohalogen compounds on the basis of $sp^3 (CX)$ bonds.
→Read the following text carefully and answer the questions that follow:
The actinoids include the fourteen elements from Th to$ Lr.$ The actinoids are radioactive elements and the earlier members have relatively long half$-$lives, the latter ones have half$-$life values ranging from a day to $3$ minutes for lawrencium. The latter members could be prepared only in nanogram quantities. Actinoids show a greater range of oxidation states. The elements, in the first half of the series frequently exhibit higher oxidation states. The actinoids resemble the lanthanoids in having more compounds in $+3$ state than in the $+4$ state. All the actinoids are believed to have the electronic configuration of $7s^2$ and variable occupancy of the $5f$ and $6d$ subshells. The magnetic properties of the actinoids are more complex than those of the lanthanoids. The variation in the magnetic susceptibility of the actinoids with the number of unpaired $5f$ electrons is roughly parallel to the corresponding results for the lanthanoid.
$i.$ Actinoid contraction is greater from element to element than lanthanoid contraction. Why?
$ii.$ Actinoids show irregularities in their electronic configuration. Justify?
$iii.$ The actinoid metals are all silvery in appearance but display a variety of structures than lanthanoid give reason.
$OR$
$iii.$ The magnetic properties of the actinoids are more complex than those of the lanthanoids. Why?
→The actinoids include the fourteen elements from Th to$ Lr.$ The actinoids are radioactive elements and the earlier members have relatively long half$-$lives, the latter ones have half$-$life values ranging from a day to $3$ minutes for lawrencium. The latter members could be prepared only in nanogram quantities. Actinoids show a greater range of oxidation states. The elements, in the first half of the series frequently exhibit higher oxidation states. The actinoids resemble the lanthanoids in having more compounds in $+3$ state than in the $+4$ state. All the actinoids are believed to have the electronic configuration of $7s^2$ and variable occupancy of the $5f$ and $6d$ subshells. The magnetic properties of the actinoids are more complex than those of the lanthanoids. The variation in the magnetic susceptibility of the actinoids with the number of unpaired $5f$ electrons is roughly parallel to the corresponding results for the lanthanoid.
$i.$ Actinoid contraction is greater from element to element than lanthanoid contraction. Why?
$ii.$ Actinoids show irregularities in their electronic configuration. Justify?
$iii.$ The actinoid metals are all silvery in appearance but display a variety of structures than lanthanoid give reason.
$OR$
$iii.$ The magnetic properties of the actinoids are more complex than those of the lanthanoids. Why?
Derive nernst equation for Daniel cell
Write down reaction of halogens with metals. ### Give Fittig, Wurtz - Fittig and Grignard reaction of haloarene.
Discuss the nature of bonding in $\left.[CoF _6\right]^{3-}$ coordination entities on the basis of valence bond theory.
→Derive integrated rate equation for first order reaction and also explain how than rate constant can be determine with help of graph.
Why Haloarenes are less reactive towards nucleophilic substitution reactions. Give reasons.
$MnO$ is basic whereas $Mn_2O_7$ is acidic in nature. Give reason.
→Write detailed note on the addition reaction of aldehydes and ketones with ammonia derivatives.