An element with atomic number 84 and mass number 218 loses one a-particle and two -particles in three successive stages .The resulting element will have :
at. no. 84 and mass no. 214
at no. 82 and mass no. 214
at. no. 84 and mass no. 218
at. no. 82 and mass no. 218
An organic substance containing carbon , hydrogen and oxygen gave the following percentage composition .
C = 40.687 % , H = 5.085% and O = 54.228 %
What is the empirical formula of the compound ?
CH3O
C2H2O
CH4O
C2H3O2
The function of anhydrous AlCl3 in the Friedel-Craft's reaction is to :
absorb water
absorb HCl
to produce electrophile
to produce nucleophile
C.
to produce electrophile
The function of anhydrous AlCl3 in the Friedel-Craft's reaction is to produce electrophile , eg , in case of Friedel Craft's alkylation reaction ,it produces electrophile as :
CH3-Cl + AlCl3
Calcium burns in nitrogen to produce a white powder which dissolves in sufficient water to produce a gas A and an alkaline solution .The solution on exposure to air produces a thin solid layer of B on the surface .The compounds A and B will be :
Ca3N2 , NH3
NH3 , CO2
Ca(OH)2 , CaCO3
NH3 , CaCO3
Consider the reaction ,
Fe2+ Fe3+ + e-
the reaction towards the left is a reduction
the reduction towards the right is a reduction
the reaction towards the right is an oxidation
the reaction towards the right is an oxidation and the reaction towards the left is an reduction
When two double bonds are present on adjacent carbon atoms , the diene is called as :
conjugated diene
cumulative diene
isolated diene
None of these
B RCCR A ,
A and B are geometrical isomers (RCH=CHR)
A is cis , B is trans
A is trans , B is cis
A and B both are cis
A and B both are trans