Chemistry : Organic Chemistry – Some Basic Principles and Techniques

Which one of the following is the correct order of increasing basic strength of nitrogen compounds in aqueous solution?

• NH₃ < C₂H₅NH₂ < C₆H₅NH₂ < (C₂H₅)₂NH < C₆H₅CH₂NH₂

• C₆H₅NH₂ < NH₃ < C₆H₅CH₂NH₂ < C₂H₅NH₂ <  (C₂H₅)₂NH

• (C₂H₅)₂NH < C₆H₅CH₂NH₂ < NH₃ < C₂H₅NH₂ < C₆H₅NH₂

• C₆H₅CH₂NH₂ < C₂H₅NH₂ < NH₃ < C₆H₅NH₂ < (C₂H₅)₂NH

Hyperconjugation is most useful for stabilising which of the following carbocations?

• Neo-pentyl

• Tert-butyl

• Iso-propyl

• Ethyl

The isomerism that arises due to restricted bond rotation is

• metamerism

• optical isomerism

• position isomerism

• geometrical isomerism

The IUPAC name of the following compound,[(CH₃)₂CH—CH₂—CH=CH—CH=CH(C₂H₅)—CH₃] is

• 2, 8-dimethyl-4, 6-decadiene

• 1, 1, 7, 7-tetramethyl-2, 5-octadiene

• 1, 5-diisopropyl-1, 4-hexadiene

• 3, 9-dimethyl-4, 6-decadiene

Aryl halides doesn't undergo nucleophilic substitution reactions under ordinary conditions because of

1. approach of nucleophile is retarded
2. carbon carrying halogen atoms is sp³-hybridised
3. the substrate molecule is destabilised due to resonance
4. partial double bond character between carbon and halogen

• 2 and 4 only

• 1 and 4 only

• 2 and 3 only

• 2, 3 and 4 only

A solution containing 1.8 g of a compound (empirical formula CH₂O) in 40 g of water is observed to freeze at -0.465°C. The molecular formula of the compound is (k_f of water = 1.86 kg K mol^-1)

• C₂H₄O₂

• C₃H₆O

• C₆H₁₂O₆

• C₅H₁₀O₅

The IUPAC name of the compound CH₃-CH(CH₃) CO- CH₃ is

• 3-methyl 2-butanone

• 2-methyl 3-butanone

• isopropyl methyl ketone

• methyl isopropyl ketone

Among the following pairs, the pair that illustrates stereoisomerism is

• 1-butanol and 2-butanol

• cis - 2-butene and trans - 2-butene

• dimethyl ether and ethanol

• acetone and propanal

The compound CHCl=CHCHOHCOOH with molecular formula C₄H₅O₃Cl can exhibit

• geometric, optical, position and functional isomerism

• geometric, optical and functional isomerism

• position and functional isomerism only

• geometric and optical isomerism only

In Lassaigne's test for the detection of halogens, the sodium fusion extract is first boiled with concentrated nitric acid. This is

• to remove silver halides

• to decompose Na₂S and NaCN, if present

• to dissolve Ag₂S

• to dissolve AgCN, if formed