Q. No.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 IUPAC name of the compound 
1. 5-formylhex-2-en-3-one
2. 5-methyl-4-2-en-5-el
3. 3-keto-2-methylhex-5-enal
4. 3-keto-2-methylhex-4-enal
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 |
With respect to the conformers of ethane, which of the following statements is true?
| 1. | Bond angle changes but bond length remains the same |
| 2. | Both bond angle and bond length change |
| 3. | Both bond angle and bond length remain the same |
| 4. | Bond angle remains the same but the bond length changes |
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 about the SN1 reaction is:
| 1. | 100 % racemisation. |
| 2. | Inversion more than retention leads to partial racemisation. |
| 3. | 100 % retention. |
| 4. | 100 % Inversion. |
Which of the following statements is not correct for a nucleophile?
1. Nucleophile is a Lewis acid.
2. Ammonia is a nucleophile.
3. Nucleophiles attack low electron density sites.
4. Nucleophiles are not electron-seeking.
Two possible stereo-structures of CH3CHOH.COOH, that are optically active, called:
| 1. | Diastereomers | 2. | Atropisomers |
| 3. | Enantiomers | 4. | Mesomers |
In Duma's method for estimation of nitrogen, 0.25 g of an organic compound gave 40 mL of nitrogen collected at 300 K temperature and 725 mm pressure. If the aqueous tension at 300 K is 25 mm, the percentage of nitrogen in the compound is:
| 1. | 17.36 | 2. | 18.20 |
| 3. | 16.76 | 4. | 15.76 |
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