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

The oxidation of toluene to benzaldehyde by chromyl chloride is called ______.

The formula Co(NH₃)₅CO₃Cl could represent a carbonate or a chloride. Write the structures and names of possible isomers.

State Henry’s law and explain why are the tanks used by scuba divers filled with air diluted with helium (11.7% helium, 56.2% nitrogen and 32.1% oxygen)?

Assume that argon exerts a partial pressure of 6 bar. Calculate the solubility of argon gas in water. (Given Henry’s law constant for argon dissolved in water, K_H = 40 k bar)

Write any two consequences of Lanthanoid Contraction.

Convert the following:

Benzoic acid to Benzaldehyde.

Explain the following reactions:

Stephan reaction

Predict the reagent for carrying out the following transformations:

Benzoyl chloride to Benzaldehyde

Write the IUPAC name of the following complex:

[CoBr₂(en)₂]⁺

Arrange the following in increasing order of their boiling point:

C₂H₅OH, C₂H₅NH₂, (C₂H₅)₃N

Solubility of gas in liquid decreases with increase in ______.

The formula of the complex Iron (III) hexacyanidoferrate(II) is ______.

In which of the following solvents, the \[\ce{C4H8NH3+X–}\] is soluble?

Assertion (A): Strong oxidising agents oxidise toluene and its derivatives to benzoic acids.

Reason (R): It is possible to stop the oxidation of toluene at the aldehyde stage with suitable reagents.

Select the most appropriate answer from the options given below:

Write the formula for the following coordination compound.

Bis (ethane-1,2-diamine) dihydroxidochromium (III) chloride

An organic compound with molecular formula \[\ce{C7H7NO2}\] exists in three isomeric forms, the isomer ‘A’ has the highest melting point of the three. ‘A’ on reduction gives compound ‘B’ with molecular formula \[\ce{C7H9N}\]. ‘B’ on treatment with \[\ce{NaNO2/HCl}\] at 0-5° C to form compound ‘C’. On treating C with \[\ce{H3PO2}\], it gets converted to D with formula \[\ce{C7H8}\], which on further reaction with \[\ce{CrO2Cl2}\] followed by hydrolysis forms ‘E’ \[\ce{C7H6O}\]. Write the structure of compounds A to E. Write the chemical equations involved.

Account for the following:

N-ethylbenzene sulphonyl amide is soluble in alkali.

Account for the following:

Reduction of nitrobenzene using Fe and HCl is preferred over Sn and HCl.

Arrange the decreasing boiling point.

\[\ce{CH3COOH, C2H5OH, CH3NH2, CH3OCH3}\]

Write the name of the reaction, structure and IUPAC name of the product formed when:

CH₃CH₂CN reacts with stannous chloride in the presence of hydrochloric acid, followed by hydrolysis.