1. | 4 | 2. | 8 |
3. | 12 | 4. | 16 |
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 |
The most stable conformation of n-butane among the following is:
1. | 2. | ||
3. | 4. |
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 carbocation among the following that doesn't get stabilized by resonance is :
1. | 2. | ||
3. | 4. |
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 |