List of top Chemistry Questions

The reaction shown is: \[ \text{Phenol} + \text{CHCl}_3 + \text{NaOH} \rightarrow \text{Salicylaldehyde} \] What is the name of the above reaction?
Which among the following has the highest molar elevation constant?
Which of the following is the set of neutral oxides? (a) \( \text{Al}_2\text{O}_3, \text{Cl}_2\text{O}_7 \), b) \( \text{N}_2\text{O}, \text{CO} \)
What is the formula of lanthanoids with sulfur?
Find the pH of the solution if \( [\text{H}^+] = 2 \times 10^{-4} \, \text{mol/L} \).
What is the order of the SN2 reaction for the compounds: \[ \text{2-methyl-2-bromo-butene}, \quad \text{2-bromo-butene}, \quad \text{1-bromo-butane} \]
Which among the following acts as a Lewis acid? \[ A) \text{AlCl}_3, \quad B) \text{NH}_3, \quad C) \text{OH}^-, \quad D) \text{H}_2\text{O} \]
Which of the following has the highest \( K_b \) value?
Arrange in the order of conductivity: \[ \text{Na, Ag, Fe, Cu} \]
In which of the following cases does manganese have a +7 oxidation state?
Common oxidation state of Cr?
Layer's test is used for what purpose?
Which of the following bond enthalpies is the least: \[ C = C, C = O, C \equiv N, C = N \]
The disease is caused by a deficiency of riboflavin.
Number of sigma and pi bonds in methyl but-1-ene is:
Among the following, which one is incorrect? \[ \text{BrF}_5 \rightarrow \text{Trigonal bipyramidal}, \quad \text{SF}_4 \rightarrow \text{See saw}, \quad \text{NH}_3 \rightarrow \text{Pyramidal}, \quad \text{XeF}_4 \rightarrow \text{Square planar} \]
Initial concentration of a reaction is \( 1.68 \times 10^{-2} \) and after 10 minutes concentration becomes \( 0.84 \times 10^{-2} \). Then the rate of concentration in minutes is:
Arrange in the order of dipole moment: \[ \text{NH}_3, \, \text{NF}_3, \, \text{H}_2\text{S}, \, \text{CHCl}_2 \]
Find the half-life of a first order reaction if $ K = 2.31 \times 10^5 \, \text{s}^{-1} $.
Find the log $ K $ value, if $ \Delta G = -11.4 $ and $ 2.303 \cdot RT = 5.7 \times 10^1 $.
Bromomethane on reaction with Na and dry ether gives:
Formula of chromium ore?
Write the product of the reaction: $ \text{CH}_3 \text{CH}_2 \text{CH}_2 \text{O} \text{Na} + \text{C}_6 \text{H}_5 \text{Br} \to ? $
Which has a higher boiling point ?
Ethyl alcohol on reaction with $ H_2SO_4 $ at 413 K gives: