Which of the following statements are incorrect with respect to the allotropes of carbon?
I) Diamond is extremely hard while graphite is soft
II) Diamond is ionic but graphite is covalent
III) Diamond is a non-conductor but graphite is a good conductor of electricity
IV) Diamond has a layered structure while graphite has a network structure
Choose the incorrect statement:
In salicylic acid, there is H-bonding in conjugate base.
In which of the following pairs the first one is the stronger base than second.
Which statement among the followijng are corect?
Resonance structures of a molecule should have.
The correct heat of hydrogenation order is (p) 1,3-Pentadiene (q) 1,3-Butadiene (r) 2,3-Dimethyl-1, 3-butadiene (s) Propadiene
An organic compound on analysis gave C = 48 gm, H = 8 gm and N = 56 gm. Volume of 1.0 g of the compound was found to be 200 ml at NTP. Molecular formula of the compound is
The most stable resonating structure of following compound is O =
Maximum charge separation stability increases
Then and is (D).
2.34 The correct resonation structre of 1, 3-butadiene is -
The correct stable resonating structure of benzene is -
Identify the correct sequence according to electronegativity.
In the sequence ” F` > OH` > NH2` > CH3`”, F’ is the most stable one and CH3‘ is the least stable one, as the stability of the anions increases on moving towards the right of the periodic table.
Match the following
p) m is more
(q) m is less
(r) Larger C– N compared to C – NO2
(s) Larger C – N bond largteer compared to aniline
Stearic inhibition of resonance cause no change in bond length.
Match the pKa values with the given compounds
NH is acidic instead of basic due to three resonating of Conjugate base. As Shown in the adjacent diagram
It shows that conjugate base is very stable. The basic site in phthalimide is 0 not be N atom. Again it is due to resonance stabilisation
Partial reduction of phenyl cyanide with stannous chloride and passing dry HCl gas in ether solution followed by hydrolysis of the aldimine stannic chloride with water to form benzaldehyde is called as which of the following method of preparation of benzaldehyde?
Partial reduction of phenyl cyanide with stannous chloride and passing dry HCl gas in ether solution followed by hydrolysis of the aldimine stannic chloride with water to form benzaldehyde is called as Stephan’s reaction.
The number of sigma and pi-bonds in 1-butene 3-yne are