Chemistry : Organic Chemistry – Some Basic Principles and Techniques

Which of the following compounds does not rotate the plane polarised light ?

• 2-chloropropanoic acid

• 2-chlorobutane

• 4-hydroxy heptane

• 2-chloro-1-deuteropropane

Which of the following represents the correct increasing order of electron pair availability on nitrogen based on hyperconjugation and + I and-I effects arising from alkyl groups?

• iv < iii < ii< i

• iv <i <iii< ii

• i< ii< iii< iv

• i<iv <iii < ii

Cyclohexane, methylcyclopentane, 1, 3-dimethyl cyclobutane and 1, 2, 3-trimethyl cyclopropane are examples of which one of the following? 

• Constitutional isomers

• Structural isomers

• Both (a) and (b)

• Structural as well as positional isomers

How many structural isomers are possible for a molecule of C₆H₁₂,composition but having at least-one carbocyclic ring?

• Seven

• Six

• Five

• None of these 

The configurations of the chiral centres in A and B are, respectively, as

• R and S

• S and R

• R and R

• S and S

IUPAC name of the compound is

• 2-methyl-6-ethyloct-1, 5-dienal

• 3-ethyl-7-methyloct-2, 6-dienal

• 7-methyl-3-ethyloct-2, 6-dienal

• None of the above

Which of the following is the most stable compound?

• Ph₃$\stackrel{+}{\mathrm{C}}$

• Ph₂$\stackrel{+}{\mathrm{C}}$H

• Ph₂$\stackrel{+}{\mathrm{C}}$H₂

• Ph$\stackrel{+}{\mathrm{C}}$H₂

Detection of sulphur in sodium extract (Lassaigne test) is not done by which of the following reagents?

• Pb(OAc)₂

• Sodium nitroprusside

• Both Pb(OAc)₂ and Sodium nitroprusside

• Silver nitrate

The correct order of basic strength of the following are

• 1 > 2 > 3 > 4

• 4 > 2 > 3 > 1

• 3 > 4 > 2 > 1

• 3 > 2 > 4 > 1

Which of the following orders is not correct regarding the -I effect of the substituents?

• —SR < —OR <—O⁺R₂

• —N⁺R₂ < —OR<—F
  

• —I< —Cl <—Br < —F

• —N⁺R₃<—O⁺R₂ <—OR