List of practice Questions

What happens when (any three): (a) Phenyl magnesium bromide is treated with CH\(_3\)CHO followed by hydrolysis.

Give plausible explanation for the following: (a) Diazonium salts of aromatic amines are stable.
(b) Aniline does not undergo Friedel–Crafts reaction.
(c) Aniline on nitration gives a substantial amount of meta product.

Hydrolysis of sucrose: \[ \ce{C_{12}H_{22}O_{11} + H2O \xrightarrow{H^+} C_6H_{12}O_6 + C_6H_{12}O_6} \] (a) Rate law equation
(b) Molecularity and order of reaction
(c) What do you call such reactions?

Account for the following: (a) The dipole moment of chlorobenzene is lower than that of cyclohexylchloride.

The electrical resistance of a column of 0.05 M NaOH solution of cell constant \( 50\ \text{cm}^{-1} \) is \( 4.5 \times 10^3\ \Omega \). Calculate its resistivity, conductivity and molar conductivity.

(a) Draw the geometrical isomers of the complex \([ \text{Pt(NH}_3)_2\text{Cl}_2 ]\).

Calculate elevation of boiling point when 4 g of MgSO\(_4\) is dissolved in 100 g water. (Molar mass = 120 g/mol), \( K_b = 0.52\ \text{K kg mol}^{-1} \), assume complete ionisation.

Write the reaction of glucose with: (a) HI

The thermal decomposition of an acid is a first-order reaction with a rate constant of \(2.3 \times 10^{-5}\ \text{s}^{-1}\) at a certain temperature. Calculate how long it will take for three-fourths of the initial quantity of acid to decompose. (\(\log 4 = 0.6021\), \(\log 2 = 0.3010\))

Draw the structures of major monohalogenation products in the following reactions:

Account for the following: (i) CH\(_3\)CHO is more reactive than CH\(_3\)COCH\(_3\) towards reaction with HCN.

Give chemical tests to distinguish between the following pairs: (i) Propanal and Propanone

Write the reactions involved in the following:

Assertion (A): Cu\(^{2+}\) iodide is not known.
Reason (R): Cu\(^{2+}\) has strong tendency to oxidise I\(^{-}\) to iodine.

Assertion (A): Rate constant increases with increase in temperature.
Reason (R): Increasing the temperature of the substance increases the fraction of molecules which collide with energies greater than activation energy.

The chemical test which can be used to distinguish between ethanamine and aniline is:

Assertion (A): Maltose is a reducing sugar.
Reason (R): Maltose is composed of two glucose units in which C-1 of one glucose unit is linked to C-4 of another glucose unit.

Assertion (A): Acetamide (structure: \(\text{C}_6\text{H}_5\text{NHCOCH}_3\)) is less basic than aniline.
Reason (R): Acetylation of aniline results in decrease of electron density on nitrogen.

The IUPAC name of the complex \([ \text{Co(NH}_3 )_5(\text{NO}_2)]\text{Cl}_2\) is:

Williamson’s synthesis of preparing dimethyl ether is a/an:

For a chemical reaction A \(\rightarrow\) B, it was observed that the rate of reaction doubles when the concentration of A is increased four times. The order of the reaction is:

Considering the strength of the ligand, the highest excitation energy will be observed in:

Which of the following does not undergo aldol condensation?

The correct IUPAC name of \((\text{CH}_3)_3\text{C–CH}_2\text{Br}\) is:

Out of Fe\(^{2+}\), Co\(^{2+}\), Cr\(^{3+}\), Ni\(^{2+}\), the one which shows highest magnetic moment is: