The most suitable method used for the separation of 1:1 mixture of ortho and para-nitrophenols is:
1. | Chromatography | 2. | Crystallization |
3. | Steam distillation | 4. | Sublimation |
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 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
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 |
Which structure corresponds to the IUPAC name 3-Ethyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid?
1. | 2. | ||
3. | 4. |
The correct order of increasing bond length of C-H, C-O, C-C and C=C is:
1.
2.
3.
4.
The Lassaigne’s extract is boiled with conc. while testing for halogens, because it:
1. Helps in the precipitation of
2. Increases the solubility product of
3. Increases the concentration of ions
4. Decomposes and , if formed
The most stable conformation of n-butane among the following is:
1. | 2. | ||
3. | 4. |
What is the correct sequence of acidity for the following compounds?
1. | CH3COOH > BrCH2COOH > ClCH2COOH > FCH2COOH |
2. | FCH2COOH > CH3COOH > BrCH2COOH > ClCH2COOH |
3. | BrCH2COOH > ClCH2COOH > FCH2COOH > CH3COOH |
4. | FCH2COOH > ClCH2COOH > BrCH2COOH > CH3COOH |