PUC Science 2nd PUC Class 12 - Karnataka Board PUC Question Bank Solutions

How is dacron obtained from ethylene glycol and terephthalic acid?

Write reactions of the final alkylation product of aniline with excess of methyl iodide in the presence of sodium carbonate solution.

Write chemical reaction of aniline with benzoyl chloride and write the name of the product obtained. 

Write structures of different isomers corresponding to the molecular formula C₃H₉N. Write the IUPAC names of the isomers which will liberate nitrogen gas on treatment with nitrous acid.

Arrange the following compounds in increasing order of their boiling points.

CH₃CHO, CH₃CH₂OH, CH₃OCH₃, CH₃CH₂CH₃

Give the structure of the product you would expect when the following alcohol reacts with HCl–ZnCl₂.

Butan-1-ol

Give two reactions that show the acidic nature of phenol.

Explain how does the −OH group attached to a carbon of benzene ring activate it towards electrophilic substitution?

Which alkyl halide from the following pair would you expect to react more rapidly by an S_N2 mechanism? Explain your answer.

CH₃CH₂CH₂CH₂Br or \[\begin{array}{cc}
\ce{CH3CH2CHCH3}\\
\phantom{...}|\\
\phantom{....}\ce{Br}\ 
\end{array}\]

In the following pair of halogen compounds, which compound undergoes a faster S_N1 reaction?

In the following pair of halogen compounds, which compound undergoes a faster S_N1 reaction?

Write the isomers of the compound having the formula C₄H₉Br.

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:

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