Chemistry : Organic Chemistry – Some Basic Principles and Techniques

Out of the following isomeric alcohols containing five carbon atoms, the alcohol that exhibits optical isomerism is

• 1-pentanol

• 2-pentanol

• 3-pentanol

• 2-methyl-2-butanol

The IUPAC name of the complex [Co(NH₃)₂(H₂O)₄]Cl₃ is

• diaminetetraaquacobalt (III) trichlodde

• diaminetetraaquacobalt (II) chloride

• diaminetetraaquacobalt (III) chloride

• tetraaquadiaminecobalt (III) trichloride

How many monochloro structural isomers are expected in free radical monochlorination of 2-methylbutane?

• 3

• 4

• 5

• 6

While assigning R, S configuration, the correct order of priority of groups attached to chiral carbon atom is

• CONH₂ > COCH₃ > CH₂OH > CHO

• CONH₂ > COCH₃ > CHO > CH₂OH

• COCH₃ > CH₂OH > CHO > CH₂OH

• CHO > CH₂OH > COCH₃ > CONH₂

The correct IUPAC name of the following compound is

• 4-bromo-3-methylpent-2-ene

• 2-bromo-3-methylpent-4-ene

• 3-methyl- 4-bromopent-2-ene

• 3-methyl-2-bromopent-4-ene

Which one among the following cannot exhibit enantiomerism?

• Diphenyl methanol

• 1-bromo-2-chlorobutane

• 2-butanol

• Tartaric acid

The total number of acyclic structural isomers possible for compound with molecular formula C₄H₁₀O is

• 9

• 7

• 5

• 6

An organic compound A containing nitrogen, on acid catalysed hydrolysis produces a water soluble organic compound B and a gaseous compound C. When methyl magnesium bromide is slowly added to A in 1: 1 ratio and hydrolysed, it produces a compound which can be obtained by dry distillation of the calcium salt of B. The compound A is

• N-methylmethanamide

• N-ethylmethanamide

• acetonitrile

• N, N-dimethylmethanamide

In the estimation of sulphur by Carius method, 0.480 g of an organic compound gives 0.699 g of barium sulphate. The percentage of sulphur in this compound is (Atomic masses Ba = 137, S = 32, O = 16)

• 20%

• 15%

• 35%

• 30%

The least stable free radical is

• CH_{32$\stackrel{.}{\mathrm{C}}$H}

• $\stackrel{.}{\mathrm{C}}$H₃

• (CH₃)₂$\stackrel{.}{\mathrm{C}}$H

• (CH₃)₃$\stackrel{.}{\mathrm{C}}$