Which reaction intermediate is formed during the condensation reaction between acetaldehyde and formaldehyde?
Show Hint
- $:\overline{C}H_{2}CHO$
- $\overset{+}{C}H_{2}CHO$
- $\overset{+}{C}H_{2}OH$
- $:CHCHO$
The Correct Option is A
Solution and Explanation
This is a crossed aldol condensation.
Step 2: Analysis
Formaldehyde has no $\alpha$-hydrogen, so the base abstracts an $\alpha$-hydrogen from acetaldehyde.
Step 3: Conclusion
This abstraction forms a resonance-stabilized carbanion (enolate ion): $:\overline{C}H_{2}CHO$.
Final Answer: (A)
Top MET Chemistry Questions
- In the oxidation of C\(_6\)H\(_5\)-CH\(_2\)-CH\(_3\) by KMnO\(_4\) the product formed is
- MET - 2019
- Chemistry
- Organic Reactions
- C\(_6\)H\(_6\) consists of one ring, while naphthalene consists of two rings. Both of them are aromatic and obey the (4n+2) rule. Thus the number of \(\pi\)-electrons inside rings of C\(_6\)H\(_6\) and naphthalene are respectively
- MET - 2019
- Chemistry
- Chemical bonding and molecular structure
- Acetyl salicylic acid is used as
- MET - 2019
- Chemistry
- Biomolecules
- In acid medium nitrobenzene is reduced to aniline as shown in the reaction C\(_6\)H\(_5\)-NO\(_2\) + 6[H] \(\rightarrow\) C\(_6\)H\(_5\)-NH\(_2\) + 2H\(_2\)O. The reducing agent used in this reaction is
- MET - 2019
- Chemistry
- Organic Reactions
- Among H—CHO, CH\(_3\)CHO and C\(_6\)H\(_5\)CHO, which will undergo Cannizzaro's reaction?
- MET - 2019
- Chemistry
- Organic Reactions
Top MET carbonyl compounds Questions
- Two luminous point sources separated by a certain distance are at 10 km from an observer. If the aperture of his eye is $2.5\times10^{-3}$ m and the wavelength of light used is 500 nm, the distance of separation between the point sources just seen to be resolved is
- MET - 2009
- Chemistry
- carbonyl compounds
- 2 g of a radioactive sample having half-life of 15 days was synthesised on 1st Jan 2009. The amount of the sample left behind on 1st March, 2009 (including both the days) is
- MET - 2009
- Chemistry
- carbonyl compounds
- Continuous emission spectrum is produced by
- MET - 2009
- Chemistry
- carbonyl compounds
- In a Young's double slit experiment, if the distance between the slits is halved and the distance of the screen from the slits is doubled, then the fringe width will:
- MET - 2009
- Chemistry
- carbonyl compounds
- The unit of Planck's constant is:
- MET - 2009
- Chemistry
- carbonyl compounds
Top MET Questions
- Radiation, with wavelength 6561 $?$ falls on a metal surface to produce photoelectrons. The electrons are made to enter a uniform magnetic field of $3 \times 10^{-4} T$. If the radius of the largest circular path followed by the electrons is 10 mm, the work function of the metal is close to :
- MET - 2020
- Photoelectric Effect
- If \(f(x) = \begin{cases} x, & 0 \le x \le 1 \\ 2x - 1, & 1<x \end{cases}\), then
- MET - 2019
- Continuity
Helicopters are very different from airplanes. They can do three things that airplanes cannot do. First, when airplanes move upward, they must also move forward, but helicopters can move straight up without moving ahead. Second, helicopters can fly backward, which airplanes cannot do. Third, helicopters can use their rotors to hover in the air, which is impossible for airplanes. Helicopters can perform actions that airplanes cannot, they are used for different tasks. Since, helicopters can take off without moving forward, they do not need a runway for take off. They are used in congested areas where there is no room for airplanes or in isolated areas, which do not have airports. Because they can hover, they are used on firefighting missions to drop water on fires. They are used in logging operations to lift trees out of forests. Helicopters are used as air ambulances to airlift patients out of situations, which are difficult to reach by conventional ambulances. The police used helicopters to follow suspects on the ground or to search for cars on the ground. Of course, helicopters have military uses because of their design and capabilities.
- MET - 2019
- Reading Comprehension
- Find the missing character.
- MET - 2019
- Number Patterns
- 6, 9, 12, 15, 18, ?
- MET - 2019
- Number Patterns