The IUPAC name of the compound is
pent - 4 yn - 2- ene
pent - 3-en - 1-yne
pent - 2- en-4 -yne
pent - 2- en-4 -yne
Which of the following hydrocarbons is the most reactive towards addition of H2SO4?
Ethene
Propylene
3-methyl but-1-ene
1-butene
In the reaction,
How many electron donating groups are attached with the carbon atom of unsaturated part of the product 'B' ?
Two
Three
Four
None of these
Find out the correct stereoisomeric product for the following reaction,
d-form
l- from
meso-form
racemic mixture
On warming with silver powder, chloroform is converted into
acetylene
hexachloroethane
1, 1, 2, 2-tetrachloroethane
ethylene
Hyperconjugation is most useful for stabilising which of the following carbocations?
Neo-pentyl
Tert-butyl
Iso-propyl
Ethyl
B.
Tert-butyl
On the basis of hyperconjugation, stability order of different alkyl carbocations is
3° > 2° > 1 ° > methyl
In t-butyl cation, the C-atom bearing the positive charge is attached to three methyl groups, thus it will have maximum hyperconjugate structures, which give it maximum stability.
Dihedral angle between two methyl groups of n-butane in the gauche and anti forms are
60°, 0°
0°, 60°
60, 180°
180°, 60°