Which functional group is introduced into phenol when it reacts with chloroform in the presence of dilute sodium hydroxide?
1.
-CH2Cl
2.
-COOH
3.
-CHCl2
4.
-CHO
Alkyl halides prepared by among the following reaction(s) is/are:
| I. | \(CH_3CH_2OH+HCl\xrightarrow{\bf{anh. ZnCl_2}}\) |
| II. | \(CH_3CH_2OH+HCl→\) |
| III. | \((CH_3)_3COH+HCl→ \) |
| IV. | \((CH_3)_2CHOH+HCl\xrightarrow{\bf{anh.ZnCl_2}}\) |
| 1. | I, III, and IV | 2. | I and II |
| 3. | Only IV | 4. | III and IV |
The correct statement about the SN1 reaction is:
| 1. | 100 % racemisation. |
| 2. | Inversion more than retention leads to partial racemisation. |
| 3. | 100 % retention. |
| 4. | 100 % Inversion. |
?
HCl with an alkene X reacts in accordance with Markovnikov’s rule to give 1-Chloro-1-methylcyclohexane. The structure of alkene (X) is:
| 1. |  |
2. |  |
| 3. | (1) and (2) | 4. |  |
The number of possible isomers for the complex \([Co (en)_ 2 Cl_ 2] 𝐶 𝑙 \) will be:
(en=ethylenediamine)
| 1. | Two (2) | 2. | One (1) |
| 3. | Three (3) | 4. | Four (4) |
A gas such as carbon monoxide would be most likely to obey the ideal gas law at?
1. High temperature and low pressure
2. Low temperature and high pressure
3. High temperature and high pressure
4. Low temperature and low pressure
If Avogadro number \(N_{A}\), is changed from \(6 . 022 \times \left(10\right)^{23}\)\(\text{mol}^{- 1}\) to \(6 . 022 \times \left(10\right)^{20} ~\text{mol}^{- 1}\) this would change the:
| 1. | Definition of mass in units of grams |
| 2. | Mass of one mole of carbon |
| 3. | Coefficient of chemical species in a balanced equation |
| 4. | Ratio of elements in a compound |
Gadolinium belongs to 4f series. It’s atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?
| 1. | \(\text{ [Xe] } 4f^8 6 d^2\) | 2. | \(\text { [Xe]}4 f^9 5 s^1\) |
| 3. | \(\text { [Xe] } 4f^7 5 d^1 6 s^2\) | 4. | \(\text { [Xe]} 4f^6 5 d^2 6 s^2\) |