Chemistry : Organic Chemistry – Some Basic Principles and Techniques

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

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

(+)-2-chloro-2-phenylethane in toluene racemises slowly in the presence of small amount of SbCl₂, due to the formation of

• carbanion

• carbene

• free-radical

• carbocation

Correct pair of compounds which gives blue colouration/precipitate and white precipitate, respectively, when their Lassaigne's test is separately done is

• NH₂NH₂, HCl and ClCH₂COOH

• NH₂CSNH₂ and PhCH₂Cl

• NH₂NH₂, COOH and NH₂CONH₂

• 

2-methylpropane on monochlorination under photochemical condition give

• 2-chloro-2-methylpropane as major product

• (1 : 1) mixture of 1-chloro-2-methylpropane and 2-chloro-2-methyl propane

• 1-chloro-2-methyl propane as a major product

• (1 : 9) mixture of 1-chloro-2-methylpropane and 2-chloro-2-methylpropane

The most likely protonation site in the following molecule is    

• C-1

• C-2

• C-3

• C-6

The optically active molecule is

An optically active compound having molecular formula C₂H₁₆ on ozonolysis gives acetone as one of the products. The structure of the compound is