Which named reaction contains dichlorocarbene intermediate?
- Aldol condensation
- Cannizaro
- Kolbe’s reaction
- Riemen-Tiemann reaction
The Correct Option is D
Solution and Explanation
When phenol is refluxed with the chloroform in the presence of an aqueous solution of sodium hydroxide at340K340Kfollowed by the hydrolysis, the aldehydic group(-CH=O)(-CH=O)gets introduced in the ring at the ortho position to the phenolic group.
Reimer Tiemann reaction which converts phenol to ortho-hydroxybenzaldehyde involves the formation of dichlorocarbene which acts as an electrophile and attacks on the ortho position of phenol.
Top Questions on Alcohols, Phenols and Ethers
- Match List-I with List-II:
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(A) Phenylethanone
(B) Sec-Butyl alcohol
(C) Phenylethanal
(D) Methyl n-propylketone
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- Match List-I with List-II:Choose the correct answer from the options given below:
List-I Compound
List-II Product in Basic Medium (in NaOH + Heat)
A Ethanal (I) Benzoic acid + Phenyl methanol B Methanal (II) 3-Hydroxybutanal + But-2-enal C Benzenecarbaldehyde (III) 4-Hydroxy-4-methylpentan-2-one + 4-Methylpent-3-en-2-one D Acetone (IV) Formic acid + Methanol - CUET (UG) - 2024
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Questions Asked in BITSAT exam
- Let \( ABC \) be a triangle and \( \vec{a}, \vec{b}, \vec{c} \) be the position vectors of \( A, B, C \) respectively. Let \( D \) divide \( BC \) in the ratio \( 3:1 \) internally and \( E \) divide \( AD \) in the ratio \( 4:1 \) internally. Let \( BE \) meet \( AC \) in \( F \). If \( E \) divides \( BF \) in the ratio \( 3:2 \) internally then the position vector of \( F \) is:
- BITSAT - 2024
- Vectors
- Let \( \mathbf{a} = \hat{i} - \hat{k}, \mathbf{b} = x\hat{i} + \hat{j} + (1 - x)\hat{k}, \mathbf{c} = y\hat{i} + x\hat{j} + (1 + x - y)\hat{k} \). Then, \( [\mathbf{a} \, \mathbf{b} \, \mathbf{c}] \) depends on:}
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- Let the foot of perpendicular from a point \( P(1,2,-1) \) to the straight line \( L : \frac{x}{1} = \frac{y}{0} = \frac{z}{-1} \) be \( N \). Let a line be drawn from \( P \) parallel to the plane \( x + y + 2z = 0 \) which meets \( L \) at point \( Q \). If \( \alpha \) is the acute angle between the lines \( PN \) and \( PQ \), then \( \cos \alpha \) is equal to:
- The magnitude of projection of the line joining \( (3,4,5) \) and \( (4,6,3) \) on the line joining \( (-1,2,4) \) and \( (1,0,5) \) is:
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- The angle between the lines whose direction cosines are given by the equations \( 3l + m + 5n = 0 \) and \( 6m - 2n + 5l = 0 \) is:
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Concepts Used:
Alcohols, Phenols, and Ethers
Alcohol is formed when a saturated carbon atom bonds to a hydroxyl (-OH) group. It is an organic compound that contains a hydroxyl functional group attached to a carbon atom.
Phenol is formed when the -OH group replaces the hydrogen atom in benzene. It is an organic compound in which a hydroxyl group directly attaches to an aromatic hydrocarbon.
Ether is formed when oxygen atom bonds to two alkyl or aryl groups. It is an organic compound that has an oxygen atom that is connected to two aryl and alkyl groups.
Read More: Alcohol, Phenol, and Ethers