Chemistry : Organic Chemistry – Some Basic Principles and Techniques

Which one of the nitrogen atoms in $\underset{\mathrm{I}}{{\mathrm{H}}_2\mathrm{N}} - \underset{\mathrm{II}}{\mathrm{NH}} - \mathrm{CO} - \underset{\mathrm{III}}{{\mathrm{NH}}_2}$ is the most nucleophilic?

• III

• I

• II

• All three nitrogen atoms are equally strong nucleophilic centres

The maximum number of possible optical isomers in 1-bromo-2-methyl cyclobutane is

• 4

• 2

• 8

• 16

Which one of the following is the most energetic conformation of cyclohexane?

• Boat

• Twisted boat

• Chair

• Half-chair

Formic acud is a stronger acid than acetic acid. This can be explained using

• +M effect

• -I effect

• +I effect

• -M effect

The IUPAC name of 

• but-3-enoic acid

• but-1-enoic-acid

• pent-4-enoic acid

• prop-2-enoic acid

Mesomeric effect involves

• delocalisation of π- electron

• delocalisation of σ- electron

• partial displacement of electrons

• delocalisation of π and σ- electron

The IUPAC name of 

• 2-hydroxy-4-pentanone

• 2-oxo-4-pentanol

• 4-keto-2-pentanol

• 4-hydroxy-2-pentanon

An oxygen containing organic compound was found to contain 52% carbon and 13% of hydrogen. Its vapour density is 23.The compound reacts with sodium metal to liberate hydrogen. A functional isomer of this compound is

• ethanal

• methoxy methane

• methoxy ethane

• ethanol

The number of optical isomers of the compound CH₃—CHBr—CHBr—COOH is

• 0

• 1

• 3

• 4

Mesa compounds do not show optical activity because

• they do not contain chiral carbon atoms

• they have non-superimposable mirror images

• they contain plane of symmetry

• they do not contain plane of symmetry