Which statement is not correct for ortho and para hydrogen?

• They have different boiling points

• Ortho-form is more stable than para-form

• They differ in their nuclear spin

• The ratio of ortho to para hydrogen changes with change in temperature

In the IUPAC system, PhCH₂CH₂CO₂H is named as

• 3-phenylpropanoic acid

• benzylacetic acid

• carboxyethylbenzene

• 2-phenylpropanoic acid

The correct order of acid strengths of benzoic acid (X), peroxybenzoic acid (Y) and p-nitrobenzoic acid (Z) is

• Y > Z > X

• Z > Y > X

• Z > X > Y

• Y > X > Z

The structure of the product P of the following reaction is

Choose the correct statement(s) among the following.

• 

• CH₃CHO on reaction with HCN gives racemic mixture 

• 

• CH₃-CH=NOH shows geometrical isomerism

Optical isomerism is exhibited by (ox= oxalate anion; en= ethylenediamine).

• cis-[CrCl₂(ox)₂]^3-

• [Co(en)₃]³⁺

• trans-[CrCl₂(ox)₂]^3-

• [Co(ox)(en)₂]⁺

In a mixture, two enantiomers are found to be present in 85% and 15% respectively. The enantiomeric excess (ee) is

• 85%

• 15%

• 70%

• 60%

Among the following structures the one which is not a resonating structure of others is

• I

• II

• III

• IV

29.

In the Lassaigne's test for the detection of nitrogen in an organic compound, the appearance of blue coloured compound is due to

• ferric ferricyanide

• ferrous ferricyanide

• ferric ferrocyanide

• ferrous ferrocyanide

The IUPAC name of the compound X is

• 4-cyano-4-methyl-2-oxopentane

• 2-cyano-2-methyl- 4-oxopentane

• 2, 2-dimethyl-4-oxopentanenitrile

• 4-cyano-4-methyl-2-pentanone