Science (English Medium) कक्षा १२ - CBSE Question Bank Solutions for Chemistry

What are ambident nucleophiles? Explain with an example.

Which compound in the following pair will react faster in S_N2 reaction with OH⁻?

CH₃Br or CH₃I

Which compound in the following pair will react faster in S_N2 reaction with OH⁻?

(CH₃)₃CCl or CH₃Cl

How will you bring about the following conversion?

Toluene to benzyl alcohol

Write the structure of the major organic product in the following reaction:

\[\ce{CH3CH(Br)CH2CH3 + NaOH ->[water]}\]

Write the structure of the major organic product in the following reaction:

\[\ce{CH3CH2Br + KCN ->[aq.ethanol]}\]

Write the structure of the major organic product in the following reaction:

\[\ce{CH3CH2CH2OH + SOCl2 ->}\]

Write the mechanism of the following reaction:

\[\ce{{n}BuBr + KCN ->[EtOH-H2O] {n}BuCN}\]

Arrange the compounds of the following set in order of reactivity towards S_N2 displacement:

2-Bromo-2-methylbutane, 1-Bromopentane, 2-Bromopentane

Arrange the compounds of the following set in order of reactivity towards S_N2 displacement:

1-Bromo-3-methylbutane, 2-Bromo-2-methylbutane, 2-Bromo-3-methylbutane

Arrange the compounds of the following set in order of reactivity towards S_N2 displacement:

1-Bromobutane, 1-Bromo-2, 2-dimethylpropane, 1-Bromo-2-methylbutane, 1-Bromo-3-methylbutane

Out of C₆H₅CH₂Cl and C₆H₅CHClC₆H₅, which is more easily hydrolysed by aqueous KOH.

The treatment of alkyl chlorides with aqueous KOH leads to the formation of alcohols but in the presence of alcoholic KOH, alkenes are major products. Explain.

What happens when chlorobenzene is subjected to hydrolysis?

What happens when ethyl chloride is treated with aqueous KOH?

What happens when methyl chloride is treated with KCN?

How the following conversion can be carried out?

Ethyl chloride to propanoic acid.

C–Cl bond length in chlorobenzene is shorter than C–Cl bond length in CH₃–Cl.

S_N1 reactions are accompanied by racemization in optically active alkyl halides.

Orange colour of `Cr_2O_7^(2–)` ion changes to yellow when treated with an alkali. Why?