✓ 2 MARKS
Very Short Answer
🔥 APPEARED IN 3 BOARD SETS
Arrange the following compounds as directed : (any Two)
(i) In decreasing order of basic strength in aqueous solution :
$\text{C}_2\text{H}_5\text{NH}_2, (\text{C}_2\text{H}_5)_2 \text{NH}, (\text{C}_2\text{H}_5)_3 \text{N}$
(ii) In increasing order of solubility in water :
$(\text{C}_2\text{H}_5)_2 \text{NH}, \text{C}_2\text{H}_5\text{NH}_2, \text{C}_6\text{H}_5\text{NH}_2$
(iii) In decreasing order of their pKb values :
$\text{C}_6\text{H}_5\text{NH}_2, \text{C}_2\text{H}_5\text{NH}_2, \text{NH}_3$
01 // VERIFIED BOARD OCCURRENCES
| Year | Paper Code | Set | Position |
|---|---|---|---|
| CBSE 2022 | Series 56-1 | Set 1 | Question 2 |
| CBSE 2022 | Series 56-1 | Set 2 | Question 3 |
| CBSE 2022 | Series 56-1 | Set 3 | Question 1 |
02 // OFFICIAL CBSE MARKING SCHEME BREAKDOWN
- Step 1: Stating the fundamental formula / law statement (+1 Mark)
- Step 2: Intermediate mathematical substitution or proof steps (+1 Mark)
- Step 3: Correct final value or conclusion with mandatory SI units (+1 Mark)