Which one of the following statements is correct?
Hybrid orbitals do not form σ bonds.
Lateral overlap of p-orbitals or p- and d-orbitals produces -bonds.
The strength of bonds follows the order-
σp-p < σs-s < p-p
s-orbitals do not form σ bonds.
Which of the following is a proper match?
Shape | |
A. 0.115 - 0.225 | i. Triangular |
B. 0.225 - 0.414 | ii. Tetrahedral |
C. 0.414 - 0.732 | iii. Cubic |
D. 0.732 - 1 | iv. Octahedral |
A - i; B - ii; C - iv; D - iii
A - iii; B - ii; C - iv; D - i
A - i; B - iii; C - ii; D - iv
A - ii; B - iv; C - i; D - iii
The correct order of increasing C-O bond length of CO, CO2 and CO is
CO < CO2 < CO
CO2 < CO < CO
CO < CO < CO2
CO < CO2 < CO
Peroxide ion ......
(i) has five completely filled antibonding molecular orbitals
(ii) is diamagnetic
(iii) has bond order one
(iv) is isoelectronic with neon
Which one of these is correct?
(ii) and (iii)
(i), (ii) and (iv)
(i), (ii) and (iii)
(i) and (iv)
Which of the following is diamagnetic?
H
He
O2
N2
D.
N2
Hence, O2 is paramagnetic as it possesses two unpaired electrons.
C-H bond energy is about 101 kcal/ mol for methane, ethane and other alkanes but is only 77 kcal/ mol for C-H bond of CH3 in toluene. This is because :
of inductive effect due to -CH3 in toluene
of the presence of benzene ring in toluene
of resonance among the structures of benzyl radical in toluene
aromaticity of toluene
Which one of the following does not have sp2 hybridised carbon ?
Acetone
Acetic acid
Acetonitrile
Acetamide