Q. No.
What is the correct order from the weakest to the strongest carbon-oxygen bond for the following species?
(1)
(2)
(3)
(4)
According to Molecular Orbital Theory, which of the following statement is incorrect?
1. C2 has no unpaired electrons.
2. In molecule, both the bonds are bonds.
3. is paramagnetic but is diamagnetic.
4. In ion, there is one and two bonds.
Match the ionization processes listed in column I with the changes observed as listed in column II. For this use the codes given below:
| Column I | Column II | ||
| (a) | \(N_2 \rightarrow N^+_2\) | (p) | Bond order increases and magnetic property is changed. |
| (b) | \(O^+_2 \rightarrow O^{2+}_2\) | (q) | Bond order decreases and magnetic property is not changed. |
| (c) | \(B_2 \rightarrow B^+_2\) | (r) | Bond order increases and magnetic property is not changed. |
| (d) | \(NO^- \rightarrow NO\) | (s) | Bond order decreases and magnetic property is changed. |
Note: Here change in magnetic property refers to the change from diamagnetic to paramagnetic
or paramagnetic to diamagnetic.
| a | b | c | d | |
| 1. | s | q | p | r |
| 2. | s | p | q | r |
| 3. | r | q | s | p |
| 4. | p | s | q | r |
A diatomic molecule has a dipole moment of 1.2 D. If its bond length is equal to 10 -10 m , then the fraction of an electronic charge on each atom will be:
1. 42%
2. 52%
3. 37%
4. 25%
Arrange the following molecules from most to least polar.
(1) III>V>II > IV=I
(2) II>IV>III>IV>I
(3) III>II>V>IV>I
(4) V>III>II>IV=I
Which of the following statements is/are correct?
| 1. | \((CH_3)_3 COH\) is less acidic than \((CH_3)_3SiOH\) |
| 2. | Like \(CO\), its analogue \(Si\) is not stable. |
| 3. | In phosgene, \(C-O\) bond length is longer than expected while \(C-Cl\) bond length is shorter. |
| 4. | All of the above. |
The increasing order of the strength of hydrogen bond in the following mentioned linkages
is
(i) O — H — S (ii) O — H — O (iii) F – H – F (iv) F – H – O
(1) (i) < (ii) < (iv) < (iii)
(2) (ii) < (i) < (iv) < (iii)
(3) (i) < (ii) < (iii) < (iv)
(4) (ii) < (i) < (iii) < (iv)
The boiling point of is higher than that of because :
(1) The dipole moment of is greater than that of
(2) forms hydrogen bonds.
(3) has higher molecular mass than that of
(4) is more ionic than
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