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 given compound is:


1. 3-keto-2-methylhex-4-enal
2. 5-formylhex-2-en-3-one
3. 5-methyl-4-2-en-5-el
4. 3-keto-2-methylhex-5-enal

The correct statement regarding electrophile is :

Which of the following statements about the conformers of ethane is correct?”

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 most stable carbocation among the following is:

1.	`	2.
3.		4.

The correct statement about the S_N1 reaction is:

Which one 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:

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: