Practice free Alcohol, phenol & ether (Chemistry) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Conversion of cyclohexene to cyclohexanol can be conveniently achieved by:
(c) Hydroboration - oxidation reaction.
The electrophilic aromatic substitution proceeds through a:
The electrophilic aromatic substitution proceeds through the formation of a sigma complex. In this reaction, the electrophilic species (like a carbocation) attacks the aromatic ring, forming a cyclohexadienyl cation intermediate, which is a sigma complex.
Which of the following substitution of benzene is ortho-para in electrophilic substitution and ortho-para in nucleophilic substitution ?
(b) -N=O has +M and -M effect depend upon type of group attached.
Common oxidizing agents used in organic chemistry are;
(d) All these are oxidizing reagents
Which of the following is an example of the elimination reaction?
Which one of the following pairs is correctly matched?
In E1cb reaction reaction intermediate is carbanion. Hence, product formation takes place according to Hofmann rule.
Arrange the reactivity of alcohols in decreasing order for E1 elimination reaction:
(i)
(ii)
(iii)
(iv)
Select the correct answer from the codes given below:
Codes:
Reactivity stability of carbocation
In the given reaction,
[X] will be:
Consider the following statements :
(i) Pyrolytic elimination is always syn elimination.
(ii) In pyrolytic elimination, product formation takes place by most stable eclipsed conformation.
(iii) In pyrolytic elimination, product formation takes place by Hofmann rule.
(iv) In pyrrolytic elimination, product formation takes place by Saytzeff rule.
Of these statements :
The term pyrolytic elimination literally means an elimination reaction occurring in the organic substrate due to the application of heat (Greek word pyr meaning fire). Pyrolytic eliminations do not require any additional reagent or solvent to occur, and mostly carried out in the gaseous phase though can be performed in inert solvents. Thus, these type of eliminations are different from other types of eliminations (E1,E2 or E1cB) as all other types of elimination reactions require an added base (external base or solvent) to proceed. These thermal elimination reactions of molecules can also be termed as pyrolytic Ei (Elimination internal) reactions. Carboxylic esters, xanthates, amine oxides, sulfoxides and selenoxides are some substrates which commonly undergo pyrolytic eliminations.
Dichloromethane on treatment with alc. KOH/ gives:
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