19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Complete the reaction: Ph −CH = CH −CHO PhMgBr/H3O+ → Product
A and B are respectively.
Which of the following on heating with aqueous KOH, produces acetaldehyde ?
When but-2-yne is treated dil.H2SO4/HgSO4 the product formed is :
Which of the following gases when passed through warm dilute solution of H2SO4 in presence of HgSO4 gives acetaldehyde?
Which of the compounds with molecular formula C5H10 yields acetone on ozonolysis?
Which compound would give 5 – keto – 2 – methyl hexanal upon ozonolysis? (a) (b) (c) (d)
Which of the following yield 2 moles of formaldehyde on ozonolysis?
On reductive ozonolysis yields
Which of the following compound will yield 2,5- dimethylhexan-1,6-dial upon ozonolysis?
Which of the following forms an enol to the greatest extent ? (a) (b) (c) (d)
Which of the compound shown is (are) correctly named as pentane derivates, either as pentanals or pentanones ?
When enolate A is compared with enolate B (A) (B) which of the following statements is true ?
Which of the following is paradehyde?
Ethanedial has which functional group ?
The structure would be best classified as a(n)
Acetals are
Formalin is an aqueous solution of :
Which of the following statements does NOT form a part of Bohr's model of hydrogen atom?
For a Bohr atom, angular momentum of the electron is (n = 1, 2, 3 …)
The ratio of the energy difference between the 1st and 2nd Bohr orbits to that between the 2nd and 3rd Bohr orbits is
In the hydrogen spectrum, the Balmer series lies in which region?
Which series in the hydrogen spectrum lies in the ultraviolet region?
When electrons of a hydrogen atom return to the L shell (n=2) from higher energy shells, the series of lines formed is called
According to Bohr's theory, the angular momentum of an electron in 5th orbit is