List of top Chemistry Questions

(A) Explain the following reactions and write chemical equations involved: (a) Wolff-Kishner reduction
(b) Etard reaction
(c) Cannizzaro reaction
Why is chlorobenzene resistant to nucleophilic substitution reaction?
Define the following: (i) Enantiomers
(ii) Racemic mixture
Using valence bond theory, explain the hybridization and magnetic character of the following: (a) [Co(NH$_3$)$_6$]$^{3+}$ (b) [Ni(CO)$_4$]
Complete and balance the following chemical equations:
(a) \(\text{MnO}_4^- + \text{C}_2\text{O}_4^{2-} + \text{H}^+ \to \) (b) \(\text{KMnO}_4 \xrightarrow{\text{Heat}} \) (c) \(\text{Cr}_2\text{O}_7^{2-} + \text{H}_2\text{S} + \text{H}^+ \to \)
The electrical resistance of a column of 0.05 M NaOH solution of area 0.8 cm$^2$ and length 40 cm is 5 $\times$ 10$^3$ ohms. Calculate its resistivity, conductivity, and molar conductivity.
At 25°C the saturated vapour pressure of water is 24 mm Hg. Find the saturated vapour pressure of a 5% aqueous solution of urea at the same temperature. (Molar mass of urea = 60 g mol$^{-1}$)
Arrange the following compounds in increasing order of their reactivity towards SN2 displacement:
\[ \text{2-Bromo-2-methylbutane, 1-Bromopentane, 2-Bromopentane} \]

In the following pair of halogen compounds, which compound undergoes SN1 reaction faster and why?

Name the following coordination compounds according to IUPAC norms: (a) [Co(NH$_3$)$_4$(H$_2$O)Cl]Cl$_2$
(b) [CrCl$_2$ (en)$_2$]Cl
Examine the following observations: (a) Transition elements generally form coloured compounds.
(b) Zinc is not regarded as a transition element.
Define the following terms:
(a) Pseudo first-order reaction
(b) Half-life period of reaction (\(t_{1/2}\))
The decomposition of NH$_3$ on platinum surface is a zero-order reaction. What are the rates of production of N$_2$ and H$_2$ if k = 2.5 $\times$ 10$^{-4}$ mol L$^{-1}$ s$^{-1}$?
The rate constant for a zero order reaction A $\to$ P is 0.0030 mol L$^{-1}$s$^{-1}$. How long will it take for the initial concentration of A to fall from 0.10 M to 0.075 M?
Assertion (A): Vitamin D cannot be stored in our body.
Reason (R): Vitamin D is fat-soluble vitamin and is not excreted from the body in urine.
Assertion (A): Cu cannot liberate H$_2$ on reaction with dilute mineral acids.
Reason (R): Cu has positive electrode potential.
The diamagnetic species is :
The complex ions [Co(NH$_3$)$_5$(NO$_2$)]$^{2+}$ and [Co(NH$_3$)$_5$(ONO)]$^{2+}$ are called
The element having [Ar]$3d^{10}4s^1$ electronic configuration is
Which of the following has the most acidic Hydrogen?
Arrange the following compounds in their decreasing order of reactivity towards nucleophilic addition reaction.
Statement-I: Reduction of ester by DIBAL-H followed by hydrolysis gives aldehyde.
Statement-II: Oxidation of benzyl alcohol with aqueous KMnO₄ leads to the formation of benzaldehyde.
Among the above statements, identify the correct statement.

Among the following, identify the compound that is not an isomer of hexane: 

In the complex ion  Fe(C2O4)3  the Co-ordination number of Fe is

Which examples of carbohydrates exhibit \(\alpha\)-link (\(\alpha\)-glycosidic link) in their structure?