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

Name the reagent used in the following reaction: 

Oxidation of a primary alcohol to carboxylic acid.

Name the reagent used in the following reaction:

Oxidation of a primary alcohol to aldehyde.

Name the reagent used in the following reaction:

Benzyl alcohol to benzoic acid.

When 3-methylbutan-2-ol is treated with HBr, the following reaction takes place:

\[\begin{array}{cc}
\phantom{...................................}\ce{Br}\\
\phantom{..................................}|\\
\ce{CH3 - CH - CH - CH3 ->[HBr] CH3 - C - CH2 - CH3}\\
|\phantom{.........}|\phantom{...................................}|\phantom{...........}\\
\ce{CH3}\phantom{...}\ce{OH}\phantom{...............................}\ce{CH3}\phantom{.......}\\
\end{array}\]

Give a mechanism for this reaction.

(Hint: The secondary carbocation formed in step II rearranges to a more

stable tertiary carbocation by a hydride ion shift from 3rd carbon atom.)

Identify A, B, C, D, E, R and R¹ in the following:

How will you bring about the following conversion?

Bromomethane to propanone

How will you bring about the following conversion?

1-Chlorobutane to n-octane

Explain why Grignard reagents should be prepared under anhydrous conditions?

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

\[\ce{C6H5ONa + C2H5Cl ->}\]

What happens when bromobenzene is treated with Mg in the presence of dry ether?

What happens when methyl bromide is treated with sodium in the presence of dry ether?

How the following conversion can be carried out?

2-Chlorobutane to 3, 4-dimethylhexane

How the following conversion can be carried out?

Chloroethane to butane

Give the disproportionation reaction of H₃PO₃

What is the oxidation state of phosphorus in H₃PO₃?

What is the oxidation state of phosphorus in the following:

PCl₃

What is the oxidation state of phosphorus in the following:

Ca₃P₂

What is the oxidation state of phosphorus in the following:

Na₃PO₄

What is the oxidation state of phosphorus in the following:

POF₃

Complete the following reactions: