List of top Chemistry Questions

When blue light is incident on a certain metal surface, photoelectrons are emitted. When green light is incident on the same metal surface, no electrons are emitted. If the same metallic surface is exposed to yellow light,
Ionization potential of hydrogen atom is 13.6 eV. Hydrogen atom in the ground state initially is excited by monochromatic radiation of photon energy 12.75 eV. The number of spectral lines emitted by the hydrogen atom, according to Bohr’s theory will be
The dimensional formula for the product of the decay constant \(\lambda\) and the mean life of a radioactive substance is
Acetanilide is prepared by treating acetic anhydride/pyridine with
Aryl fluorides are prepared from diazonium salts using
Which of the following amine does not react with Hinsberg’s reagent?
Intramolecular hydrogen bonding is present in
Aspirin is
Benzaldehyde reacts with acetophenone in the presence of \(NaOH\) at 293 K to give benzalacetophenone. This reaction is an example of
Which of the following is the weakest acid?
Phenol is converted into benzene by heating with
Which of the following carboxylic acid is used in rubber, textile, dyeing, leather and electroplating industries?
The correct decreasing order of acidity of alkynes is
When toluene is treated with \(Cl_2\) in the presence of \(Fe\) in dark, the product formed is
When aryl halide is treated with \(Na\) in dry ether, biphenyl is formed. This reaction is called
Which of the following compound is used for the manufacture of phenol in large scale?
One mole of an alkene on ozonolysis gives one mole of propan-2-one and one mole of formaldehyde. What is the alkene?
The type of hybridization of the carbon atoms from left to right in \(CH_3 - CH = CH - CN\) is
Which of the following is a spin free complex?
The metal ion present in the Wilkinson’s catalyst is
When n-hexane is passing over $Mo_2O_3$ catalyst at 773 K and 10–20 atm pressure, the product formed is
The hydrocarbon with molecular formula $C_{20}H_{42}$
\(KMnO_4\) is prepared from Mn(II) ion salts by oxidizing it with
The lanthanoid with the outer electronic configuration \(4f^7 5d^1 6s^2\) is
The complexes \([Co(NH_3)_5Br]SO_4\) and \([Co(NH_3)_5SO_4]Br\) are examples of