Advertisements
Advertisements
प्रश्न
What are ambident nucleophiles? Explain with an example.
उत्तर
Ambident nucleophiles attack alkyl halides through two distinct atoms. This occurs due to the presence of two nucleophilic centres resulting from resonance structures in the ion. For example, the lone pair of electrons on N in the NO2 ion makes it nucleophilic, while oxygen's negative charge works as a nucleophile. Thus, NO2 can attack the O or N atoms, making it ambidentate.
\[\ce{RX + Ag - O - N = O -> \underset{Nitroalkane}{R - NO2}}\]
\[\ce{RX + KNO2 -> \underset{Alkyl nitrate}{R - O - N = O}}\]
संबंधित प्रश्न
Discuss the mechanism of alkaline hydrolysis of bromomethane.
Which would undergo SN2 reaction faster in the following pair and why ?
Which compound in the following pair will react faster in SN2 reaction with OH−?
(CH3)3CCl or CH3Cl
Given reasons: The dipole moment of chlorobenzene is lower than that of cyclohexyl chloride.
Answer the following question.
Write one stereochemical difference between SN1 and SN2 reactions.
Which of the following is optically inactive?
Which among MeX, RCH2X, R2CHX and R3CX is most reactive towards SN2 reaction?
Tertiary alkyl halides are practically inert to substitution by SN2 mechanism because of ____________.
An important chemical method to resolve a racemic mixture makes use of the formation of ______.
Which of the following compounds is optically active?
2-Bromopentane is heated with potassium ethoxide in ethanol. The major product obtained is ____________.
An organic molecule necessarily shows optical activity if it ____________.
Which of the following undergoes nucleophilic substitution exclusively by SN1 mechanism?
The reaction of C6H5–CH=CH–CH3 with HBr produces:
Complete the following analogy:
Same molecular formula but different structures: A : : Non superimposable mirror images: B
Which reagent will you use for the following reaction?
\[\ce{CH3CH2CH2CH3 -> CH3CH2CH2CH2Cl + CH3CH2CHClCH3}\]
Ethylene chloride and ethylidene chloride are isomers. Identify the correct statements.
(i) Both the compounds form same product on treatment with alcoholic KOH.
(ii) Both the compounds form same product on treatment with aq.NaOH.
(iii) Both the compounds form same product on reduction.
(iv) Both the compounds are optically active.
The major product formed in the following reaction is:
The number of chiral carbons present in the molecule given below is ______.
Acetic anhydride from acetic acid
