19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Which of the following compound will undergo self aldol condensation in the presence of cold dilute alkali
3-hydroxy butanal is formed when X reacts with Y in dilute Z solution. What are X, Y and Z? X Y Z (a) CH3CHO, (CH3)2CO, NaOH (b) CH3CHO, CH3CHO, NaCl (c) (CH3)2CO, (CH3)2CO, HCl (d) CH3CHO, CH3CHO, NaOH
Which of the products is formed when acetone is reacted with barium hydroxide solution? (a) (b) (c) (d)
Acetophenone when reacted with a base, C2H5ONa, yields a stable compound which has the structure (a) (b) (c)
Aldol condensation will not take place in
Predict the product ‘B’ in the sequence of reaction
does not show aldol condensation because :
Aldol condensation is
Treatment of propionaldehyde with dilute NaOH solution gives
Which of the following will not undergo aldol condensation
Aldol condensation will not be observed in
When dihydroxy acetone reacts with HIO4, the product is/are
The product obtained in the following reaction is (a) (b) (c) (d)
Oxidation of acetaldehyde with selenium dioxide produces:
(a) (b) (c) (d)
If the threshold frequency of a metal for the photoelectric effect is ν₀, which of the following will NOT happen?
[NEET 2022] If the radius of the second Bohr orbit of He⁺ ion is 105.8 pm, what is the radius of the third Bohr orbit of Li²⁺ ion?
[NEET 2014] Calculate the energy in joule corresponding to light of wavelength 45 nm. (h = 6.63 × 10⁻³⁴ Js, c = 3 × 10⁸ ms⁻¹)
The correct ground state electronic configuration of chromium atom (Z = 24) is
Aufbau principle does NOT give the correct arrangement of filling of atomic orbitals in
The correct order of increasing energy of orbitals in hydrogen atom is
[CBSE AIPMT 2015] The number of d-electrons in Fe²⁺ (Z = 26) is NOT equal to the number of electrons in which one of the following?
[NEET 2019] Orbital having 3 angular nodes and 3 total nodes is
[NEET 2019] 4d, 5p, 5f and 6p orbitals are arranged in order of decreasing energy. The correct option is
[Kerala CEE 2014] The maximum number of electrons that can be held by a subshell with azimuthal quantum number 'l' in an atom is given by