List of top Chemistry Questions

Write the chemical equation for the following: (a) Hydration of propene in presence of an acid
(b) Reaction between Ethyl bromide and C2H5ONa
(c) Reaction between Dimethyl ether and Hydrogen iodide
Using valence bond theory, predict: (a) Hybridisation of central metal atom of the complex \([Co(NH_3)_6]^{3+}\)
(b) Its shape and magnetic behaviour
(c) Whether it is a high spin or a low spin complex
[Atomic number: $CO$ = 27]
Write the mathematical relation between rate constant and half-life period of a zero order reaction.
Why are iron pipes usually coated with zinc?
Give reasons for the following: (a) Reduction with iron scrap and HCl is preferred for the preparation of amines from nitro compounds.
(b) Lower aliphatic amines are soluble in water.
(c) Pyridine is used in the acylation reaction of amines.
(d) Although amino group is o- and p-directing in aromatic electrophilic substitution reactions, aniline on nitration gives a substantial amount of m-nitroaniline.

Arrange the following in increasing order of their boiling points:
1-chloropropane, 2-chloropropane, 1-chlorobutane 
(A) 2-chloropropane $<$ 1-chloropropane $<$ 1-chlorobutane

Why is sulphuric acid not used during the reactions of alcohols with KI?
What is an ambident nucleophile? Give one example.
Write IUPAC name of the given complex: \( K_3[Cr(C_2O_4)_3] \)

Why is \([Ti(H_2O)_6]^{3+}\) coloured?

Write the structure of 1-chloro-4-ethylcyclohexane.
Why do amino acids show amphoteric behaviour?
What happens when D-Glucose is treated with hydroxylamine?
Assertion (A): D (+)-Glucose is dextrorotatory.
Reason (R): Symbol ‘D’ represents its dextrorotatory nature.
Assertion (A): Zn, Cd and Hg are not regarded as transition elements.
Reason (R): Zn, Cd and Hg do not have partially filled d-orbitals in their ground state or in any one of their common oxidation states.
Assertion (A): Phenol gives 2,4,6-trinitrophenol on treatment with concentrated \( HNO_3 \) and concentrated \( H_2SO_4 \).
Reason (R): –OH group in phenol is \( m \)-directing.
Assertion (A): Benzene diazonium salt is stable and can be easily stored.
Reason (R): Benzene diazonium chloride decomposes easily.
The rate of a reaction quadruples when the temperature changes from 293 K to 313 K. Calculate the energy of activation of the reaction, assuming that it does not change with temperature. \[ (\log 2 = 0.30,\; \log 4 = 0.60) \quad [R = 8.314\; J\, K^{-1}\, mol^{-1}] \]
Oxidation state of central metal atom in the given complex is: \[ [Co(NH_3)_4(H_2O)_2]Cl_3 \]
Pentan-2-one and Pentan-3-one can be distinguished by:
What would be the major product of the given reaction? \[ HCHO + CH_3MgI \xrightarrow{H_2O} \; ? \]
A galvanic cell can behave as an electrolytic cell when:
Hoffmann Bromamide Degradation reaction is given by:
Given below is the decomposition of hydrogen peroxide in alkaline medium, which is catalysed by iodide ions: \[ 2H_2O_2 \xrightarrow{I^-, \; \text{alkaline medium}} 2H_2O + O_2 \] The above reaction takes place in two steps:
Step I: \( H_2O_2 + I^- \longrightarrow H_2O + IO^- \) (slow)
Step II: \( H_2O_2 + IO^- \longrightarrow H_2O + I^- + O_2 \)
Molecularity of Step I and Step II is:
Which type of isomerism is shown by the complexes \([Co(NH_3)_5Br]SO_4\) and \([Co(NH_3)_5SO_4]Br\) ?