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Reimer-Tiemann reaction introduces an al...

Reimer-Tiemann reaction introduces an aldehyde group on to the aromatic ring of phenol, ortho to the hydroxyl group. This reacrtion involves electrophilic aromatic subsititution. It is a general method for the synthesis of subsituted salicyladehydes as depiced below:

The electrophile in this reaction is:

A

B

C

D

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The correct Answer is:
B
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Reimer-Tiemann reaction introduces an aldehyde group on to the aromatic ring of phenol, ortho to the hydroxyl group. This reacrtion involves electrophilic aromatic subsititution. It is a general method for the synthesis of subsituted salicyladehydes as depiced below: Which one of the following reagents is used in the above reaction ?

The electrophile involved in the Reimer-Tiemann reaction is

Although chlorine is an electron withdrawing group, yet it is ortho-, para- directing in electrophilic aromatic substitution reactions. Why?

In an electrophilic aromatic substitution reaction, the nitro group is meta directing because of it?

The most deactivating group for electrophilic substitution reaction in benzene ring is

Althrough chlorine is an electron withdrawing group, yet it is ortho-para-directing in electrophilic aromatic substitution reactions. Explain why it is so ?

Identify the substitute group, that acts as ortho-para director, during electrophilic substitution in aromatic compounds.

Assertion : Aromatic aldehydes and ketones undergo electrophilic substitution reaction at metaposition. Reason : Carbonyl group activates the ring towards electrophilic substitution reactions.

The typical reaction of benzene and other aromatic compounds are electrophilic substitution. Presence of electron donating group activates the ring towards electrophilic substitution, while presence of electron withdrawing group deactivates the ring towards electrophilic substituion but at the same time activates the ring towards nucleophilic subsituion. Some groups are predominantly meta-directing and all of these are deactivating. Except halogen, most of the o- and p- directing groups are activating groups. Which of the following compound is not formed. X represents mixture of organic compounds. The mixture does not contain

ALLEN-ALKENE, ALKANE & ALKYNE -EXERCISE-5
  1. Reimer-Tiemann reaction introduces an aldehyde group on to the aromati...

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  2. Reimer-Tiemann reaction introduces an aldehyde group on to the aromati...

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  3. Reimer-Tiemann reaction introduces an aldehyde group on to the aromati...

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  4. Statement 1: In bromobenzene upon reaction with Br(2)//Fe gives ,4 dib...

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  5. Statement I: Aniline on reaction with NaNO2 HCl at 0^@C followed by c...

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  6. In the reaction is/are:

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  7. Compounds (P), (Q) and (S) were separetly subjected to nitration ...

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  8. The correct order of strength of acidity of the following compounds is

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  9. In the reaction, the structure of the product T is:

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  10. Among the following compounds the most acidic is

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  11. Compound (A), C(8)H(9)Br, gives a white precipitate when warmed with a...

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  12. In the reaction shown below, the major product (s) formed is/are

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  13. The reactivity of compound Z with different halogens under appropriat...

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  14. Consider the reaction sequence below:

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  15. Fluorination of an aromatic ring is easily accompolished by treating a...

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  16. The correct statement(s) about the following reaction sequence is (are...

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  17. Among the following reaction(s), which gives(give) tert-butyl benzene ...

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  18. For the reaction C(6)H(6)+(CH(3))(2)CHCH(2)Cl overset("Anhy".AlCl(3))r...

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  19. The product is

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  20. The main product of the following reaction is : PhCH(2)CH(OH)CH(CH(...

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