Q. No.In Kjeldahl’s method for estimation of nitrogen present in the soil sample, ammonia evolved from 0.75g of sample neutralized 10ml of 1M H2SO4. The percentage of nitrogen in the soil is:
1.
37.33
2.
45.85
3.
25.75
4.
43.13
| 1. | Four (4) | 2. | Eight (8) |
| 3. | Twelve (12) | 4. | Sixteen (16) |
The correct order with respect to –I effect of the substituents is:
(R = alkyl)
1. –NH2 > –OR < –F
2. –NR2 < –OR < –F
3. –NH2 > –OR > –F
4. –NR2 > –OR > –F
The correct statement regarding electrophile is :
| 1. | Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from another electrophile |
| 2. | Electrophiles are generally neutral species and can form a bond by accepting a pair of electrons from a nucleophile |
| 3. | Electrophiles can be either neutral or positively charged species and can form a bond accepting a pair of electrons from a nucleophile |
| 4. | Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from a nucleophile |
The total number of resonating structures (excluded the given structure) formed by the given molecule are :
| 1. | 2 | 2. | 3 |
| 3. | 4 | 4. | 5 |
The IUPAC name of the above-mentioned compound is:
1. Pent-1-en-3-yne
2. Pent-1-ene-4-yne
3. Pent-4-yn-1-ene
4. Pent-1-en-4-yne
The best method used for the separation of naphthalene and benzoic acid from their mixture is -
1. Sublimation
2. Chromatography
3. Crystallisation
4. Distillation
A compound that does not give a positive test in Lassaigne’s test for nitrogen is-
| 1. | Urea | 2. | Hydrazine |
| 3. | Azobenzene | 4. | Phenyl hydrazine |
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