List of top Chemistry Questions

A solution is prepared by dissolving 5 g of a non-volatile solute in 200 g of water. It has a vapor pressure of 31.84 mm Hg at 300 K. Calculate the molar mass of the solute.
(Vapor pressure of pure water at 300 K = 32 mm Hg)
How will you bring about the following conversions? (any three)
Benzoic acid to Benzaldehyde
Ethanal to Propanone
(c) Acetophenone to Benzoic acid
(d) Bromobenzene to 1-Phenylethanol
Give the structures of A, B, and C in the following reactions:
Fe/HCl.NaNO2+HCl
Give the structures of A, B, and C in the following reactions:
KCN.LiAlH4
Name the reagent used in the bromination of phenol to form 2,4,6-Tribromophenol.
Write the reactions involved in the following:
(i) Reimer-Tiemann reaction
(ii) Kolbe’s reaction
A first-order reaction is 25% complete in 40 minutes. Calculate the value of the rate constant. In what time will the reaction be 80% complete?
[Given: \( \log 2 = 0.30 \), \( \log 3 = 0.48 \), \( \log 4 = 0.60 \), \( \log 5 = 0.69 \)]
What happens when chlorobenzene and methyl chloride are treated with sodium metal in dry ether?
What type of nucleophilic substitution (\( \text{S}_\text{N}1 \) or \( \text{S}_\text{N}2 \)) occurs in the hydrolysis of 2-Bromobutane to form \( (+-) \)-Butan-2-ol? Give reason.
Why does the presence of nitro groups at ortho- and para- positions in haloarenes increase their reactivity towards nucleophilic substitution reactions?
Which halogen compound in the following pair will react faster in \( \text{S}_\text{N}2 \) reaction and why? halogen compound in the following pair
Complete and balance the following chemical equations: \( 3 \text{MnO}_4^- + 4 \text{H}^+ \longrightarrow ? \)
\( \text{Cr}_2 \text{O}_7^{2-} + 14 \text{H}^+ + 6 \text{Fe}^{2+} \longrightarrow ? \)
State a condition under which a bimolecular reaction is kinetically a first-order reaction and give an example.
In a reaction, if the concentration of reactant \( X \) is tripled, the rate of reaction becomes twenty-seven times. What is the order of the reaction?
What type of deviation is shown by ethanol and acetone mixture ? Give reason. What type of azeotropic mixture is formed by that deviation ?
Define molal depression constant. How is it related to enthalpy of fusion?
Write the reactions of glucose with
(a) HI
(b)\((CH_3CO_2)O\)
Assertion (A): Boiling point of butan-1-ol is higher than that of butan-1-amine. Reason (R): Being more polar, butan-1-ol forms stronger intermolecular hydrogen bonds as compared to butan-1-amine.
Assertion (A): Phenol on reaction with aqueous NaOH gives sodium phenoxide.
Reason (R): This reaction supports the acidic nature of phenol.
Assertion (A): Rate of reaction decreases with increase in temperature. Reason (R): Number of effective collisions increases with increase in temperature.
Assertion (A): \( \Delta_{\text{mix}} H \) and \( \Delta_{\text{mix}} V \) are zero for an ideal solution. Reason (R): The solution which obeys Raoult’s law over the entire range of concentration is called an ideal solution.
Aniline on reaction with Bromine water gives:
Which of the following cells is used in hearing aids?
The half-life of a first-order reaction with a rate constant (\( k \)) of 3 min\(^{-1}\) is:
A 1% solution of solute ‘X’ is isotonic with a 6% solution of sucrose (molar mass = \( 342 \) g mol\(^{-1}\)). The molar mass of solute ‘X’ is: