CBSE
Multiple Choice QuestionsWhich of the following conditions is not correct for resonating structures?
The contributing structures must have the same number of unpaired electrons.
The contributing structures should have similar energies.
The contributing structures should be so written that unlike charges reside on atoms that are far apart.
The positive charge should be present on the electropositive element and the negative charge on the electronegative element.
The strained tetracyclic alkane is isomerize thermally to the cyclic alkene. The reaction involves
free radical
carbocation
carbanion
carbene.
Decreasing order of nucleophilicity is
OH- > NH > CH3O- > RNH2
NH > OH- > CH3O- > RNH2
NH > CH3O- > OH- > RNH2
CH3O- > NH > OH- > RNH2
Find the number of stereoisomers of 1,2-dihydroxy cyclopentane.
1
2
3
4
Which is optically inactive?
Assertion : C(CH3)3-CH2-Br + NaOH C(CH3)2OH-CH2-CH3
Reason : It follows with formation of more stable carbocation.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
Best method to form aromatic iodide is
ArN + KI
RNH2 + I2
ArN + KI
ArN + PI3
How much amount of CuSO4.5H2O is required for liberation of 2.54 g of I2 when titrated with KI?
2.5 gm
4.99 gm
2.4 gm
1.2 gm
How many chiral carbonatoms are present in 2 , 3 , 4 - trichloropentane ?
4
1
2
3
+ I effect is shown by :
-CH3
-Br
-Cl
-NO2
