11.

Which one of the following molecules has the least dipole moment?

• H₂O

• BeF₂

• NH₃

• NF₃

Dipole-dipole interaction energy between polar molecules in solids depends on the radius of the molecule (r) and it is directly proportional to

• (1/r³)

• (1/r⁶)

• (1/r)

• (1/r⁵)

Critical density of a gas having molecular weight 39 g mol^-1 is 0.1 × 10³ g cm^-3. Its critical volume in L mol^-1 is

• 0.390

• 3.90

• 0.039

• 39.0

The low solubility of LiF and that of CsI in water are respectively due to which of the following properties of the alkali metal ions?

• Higher hydration enthalpy of Li, higher lattice enthalpy of Cs⁺

• Smaller hydration enthalpy of Li, higher lattice enthalpy of Cs⁺

• Smaller lattice enthalpy of Li, higher hydration enthalpy of Cs⁺

• Higher lattice enthalpy of Li, smaller hydration enthalpy of Cs⁺

In aqueous solution, Cr²⁺ is a stronger reducing agent than Fe²⁺. This is because

• Cr²⁺  ion is more stable than Fe²⁺

• Cr³⁺ ion with d³ configuration has favourable crystal field stabilisation energy

• Cr³⁺ has half filled configuration and hence more stable

• Fe³⁺ in aqueous solution is more stable than Cr³⁺

Which one of the following is a benzenoid aromatic compound?

• Furan

• Thiophene

• Pyridine

• Aniline

The major product obtained by the addition reaction of HBr to 4-methylpent-1-ene in the presence of peroxide is

• 1-bromo-4-methylpentane

• 4-bromo-2-methylpentane

• 2-bromo-4-methylpentane

• 3-bromo-2-methylpentane

The number of possible stereoisomers of the compound CH₃-CH=CH-CH₃ is

• 2

• 4

• 3

• 5

Some organic compounds are given in List I and their uses in List II. Choose the correct matching.

• A - ii; B - iv; C - i; D - iii

• A - iii; B - iv; C - i; D - ii

• A - ii; B - i; C - iv; D - iii

• A - i; B - iii; C - ii; D - iv

The total number of monohalogenated products formed by halogenation of 2, 4, 4-trimethylhexane are,

• 5

• 7

• 6

• 8