CBSE
Multiple Choice QuestionsStructure of the compound whose IUPAC name is 3-ethyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid is
Sulphur trioxide can be obtained by which of the following reaction
The correct IUPAC name of the compound of 
3 - ethyl - 4 ethenyl heptane
3 - ethyl - 4 - propylhex- 5-ene
3-(1-ethyl propyl) hex - 1 ene
3-(1-ethyl propyl) hex - 1 ene
Which nomenclature is not according to IUPAC system?
Considering the state of hybridization of carbon atoms, find out the molecule among the following which is linear.
CH3 - C ≡ C - CH3
CH2 = CH - CH2 - C ≡ CH
CH3 - CH2 - CH2 - CH3
CH3 - CH2 - CH2 - CH3
The structure of isobutyl group in an organic compound is
The order of stability of the following tautomeric compound is 
I>Ii>III
III > II>I
Ii> I> III
Ii> I> III
Which of the statements is not true?
On passing H2S through acidified K2Cr2O7 solution, milky colour is observed.
Na2Cr2O7 is preferred over K2Cr2O7 in volumetric analysis
Na2Cr2O7 solution in acidic medium is orange
K2Cr2O7 solution becomes yellow on increasing the pH beyond 7
The Lassaigne's extract is boiled with conc HNO3 while testing for halogens. By doing so it
helps in the precipitation of AgCl
increases the solubility product of AgCl
increases the concentration of NO3- ions
increases the concentration of NO3- ions
The radical 
because it has
6 p -orbitals and 6 unpaired electrons
7 p- orbitals and 6 unpaired electrons
7 p- orbitals and 7 unpaired electrons
7 p- orbitals and 7 unpaired electrons
