List of top Chemistry Questions

100 percent pure ethanol is called :

Addition reactions are undergone by :

Which of the following does not belong to the same homologous series?

Which of the following is not a functional isomer pair (of each other)?

Find out incorrect statement among the following :

Ethane and ethene can be distinguished by using :

The structure of water (\(\text{H}_2\text{O}\)) molecule is resembling with :

Which of the following option correctly matches the hydrocarbon type with its bond structure?

Rain is called acid rain when its :

Covalent bonded compounds have low melting and boiling point because of :

Which of the following is dynamically the most stable state of carbon?

The numbers \(17.0145\) and \(21.0235\) were rounded to three figures after the decimal point. The resulting numbers, respectively, are

If the frequency of incident light is doubled, what happens to the stopping potential? ____.

Which of the following is a soft metal?

From the following, the least stable structure is:
(Assume standard resonance structures)

What is the oxidation state of Chlorine in \( Cl_2O_7 \)?

Number of moles and number of molecules in 1.4187 L of SO₂ at STP respectively are

The unit of rate and rate constant is same for which order of reaction?

Define Molal depression constant. 48 g of ethylene glycol (C₂H₆O₂) is dissolved in 600 g of water. Calculate (i) depression in freezing point and (ii) freezing point of the solution. [Given K_f(water) = 1.86 °C kg mol^-1]
OR
Define molality and explain mole fraction. Calculate the mole fraction of solute and solvent of a 20% aqueous C₂H₆O₂ solution.

Explain by giving four examples that the alkoxy group (-OR) activates the aromatic ring towards electrophilic substitution.
OR
Describe two methods of preparation of phenol. Give two reactions that demonstrate the acidic nature of phenol. Compare the acidity of phenol with that of ethanol.

(i) Explain the nature of the C-X bond. Give an example of a compound having sp³ C-X bonding. (ii) Write chemical equations of the following: (a) Carbylamine reaction (b) Hinsberg reaction.

Write chemical equations of three methods of preparation and two chemical properties of benzaldehyde.
OR
Write short notes on the following: (i) Aldol condensation (ii) Cross aldol condensation (iii) Cannizzaro reaction (iv) Hell-Volhard-Zelinsky reaction (v) Kolbe electrolysis.

Explain the structure of Nucleic Acid.

(i) Write the IUPAC name of the following coordination compounds: (a) K₃[Cr(C₂O₄)₃] (b) [Co(NH₃)₅(CO₃)]Cl. (ii) Write the electronic configuration of the following: (a) Cr³⁺ (b) Cu.

Describe the method of identification of primary, secondary and tertiary amines. Classify the following compounds into primary, secondary and tertiary amines: (i) C₆H₅NHCH₃ (ii) CH₃(CH₂)₂NH₂ (iii) (CH₃CH₂)₂NCH₃.