Consider the following table
| Substitute | Melting point / ºC | Boiling point / ºC |
| P | – 78 | -25 |
| Q | – 8 | 40 |
| R | – 6 | 150 |
| S | 44 | 280 |
A. P
B. Q
C. R
D. S
Correct Answer:
Option B = Q
Explanation
Q has slightly lower boiling point which when expose to air may evaporate rapidly.
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