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

Give the structure of A, B and C in the following reaction:

\[\ce{CH3CH2Br ->[KCN] A ->[LiAlH4] B ->[HNO2][0^\circ C] C}\]

Give the structure of A, B and C in the following reaction:

\[\ce{C6H5NO2 ->[Fe/HCl] A ->[NaNO2 + HCl][273 K] B ->[H2O/H+][\Delta] C}\]

Give the structures of A, B and C in the following reaction:

\[\ce{CH3COOH ->[NH3][\Delta] A ->[NaOBr] B ->[NaNO2/HCl] C}\]

Give the structures of A, B and C in the following reaction:

\[\ce{C6H5NO2 ->[Fe/HCl] A ->[HNO2][273 K] B ->[C6H5OH] C}\]

Why cannot aromatic primary amines be prepared by Gabriel phthalimide synthesis?

Write the reaction of aromatic primary amine with nitrous acid.

Write the reaction of aliphatic primary amine with nitrous acid.

Give a plausible explanation for the following:

Why are amines less acidic than alcohols of comparable molecular masses?

Write the structure of the product of the following reaction:

\[\ce{H3C - C ≡ C - H ->[Hg^{2+}, H2SO4]}\]

Complete the synthesis by giving missing starting material, reagent or product.

Complete the synthesis by giving missing starting material, reagent or product.

Complete the synthesis by giving missing starting material, reagent or product.

Show how is the following alcohol prepared by the reaction of a suitable Grignard reagent on methanal?

\[\begin{array}{cc}
\ce{CH3 - CH - CH2OH}\\
|\phantom{......}\\
\ce{CH3}\phantom{...}
\end{array}\]

Show how is the following alcohol prepared by the reaction of a suitable Grignard reagent on methanal?

Predict the major product of acid catalysed dehydration of 1-methylcyclohexanol.

Predict the major product of acid catalysed dehydration of butan-1-ol.

What is meant by hydroboration-oxidation reaction? Illustrate it with an example.

Write the mechanism of hydration of ethene to yield ethanol.

Show how will you synthesize 1-phenylethanol from a suitable alkene.

How is the following conversion carried out?

\[\ce{Propene -> Propan-2-ol}\]