Multiple Choice QuestionsWhich of the following is electron deficient
(CH3)2
(SiH3)2
(BH3)2
(BH3)2
C.
(BH3)2
Boron is an element of 13 group and contains three electrons in its valence shell. When its compound BH3 dimerises, each boron atom carry only 6e-, that is their octet is incomplete. Hence (BH3)2 is a deficient compound.
In all other given molecules octet of central atoms is complete.
Structure of the compound whose IUPAC name is 3-ethyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid is
The order of stability of the following tautomeric compound is 
I>Ii>III
III > II>I
Ii> I> III
Ii> I> III
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
What is the activation energy for a reaction if its rate doubles when the temperature is raised from 200C to 350C ?(R=8.314 J mol-1 K-1).
342 kJ mol-1
269 kJ mol-1
34.7 kJ mol-1
34.7 kJ mol-1
At 250 molar conductance of 0.1 molar aqueous solutions of ammonium hydroxide is 9.54 ohm-1 cm2 mol-1 and at infinite dilution, its molar conductance is 238 ohm-1 cm2 mol-1. The degree of ionisation of ammonium hydroxide at the same concentration and temperature is
2.080%
20.800%
4.008%
4.008%
A button cell used in watches functions as following
The cell potential will be
1.10 V
0.42 V
0.84 V
0.84 V
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