Physical Properties of Aromatic Compounds

Q. What is the order of dipole moment of antiarometic, nonaromatic and aromatic molecule and how?

Q. the specific rotation of pure enantiomer is +16, its observed rotation if it is isolated from a reaction with 25% racemisation and 75% retention, is?

Q. Number of $\pi$ electrons present in naphthalene is

1. 14

2. 4

3. 6

4. 10

Q. Select the incorrect option :

1. The aromatic hydrocarbon has a pleasant aroma (smell)
2. Aromatic hydrocarbons are miscible with water but readily immiscible with non-polar solvents (organic solvents).
3. The aromatic hydrocarbon exists either in solid or liquid state
4. Aromatic hydrocarbons are colourless.

Q.

Below 900 ⁰C, BeCl₂ in vapour phase exists as:

1. BeCl₂

2. Be₂Cl₄

3. BeCl₂ and Be₂Cl₄

4. Be₂Cl₄

Q. Why substances having high solubility product values are precipitated more ?

Q. Define following terms: 1)Planetary electron 2)predominant form 3)terrestrial hydrogen 4)fusion reaction 5)elemental hydrogen 6)disprotium 7)fractional evaporation 8)amalgams 9)hydrolysis 10)electrolysis 11)Uyenos method 12)partial oxidation 13)atomic torch 14)occluded hydrogen 15)ultrapurification 16)polymeric hydride 17)complex hydride 18)hybridised 19)crystal 20)crystallation 21)crystal lattice 22)lattice 23)anhydrous 24)lather 25)ion-exchange resins 26)calgon 27)permutit 28)nuclear reactor 29)peroxide 30)oxygenated 31)catalyst 32)exposure 33)paraffin wax coated plastic 34)teflon bottle 35)polythene bottle 36)germicide 37)perhydrol 38)molarity 39)affinity 40)ionisation enthalpy 41)atomicity

Q. 50. how many moles of electrons weigh seven kilogram

Q. why in benzyne the electrons of triplet bond cannot participate in resonance?

Q. If dipole moment of a molecule A-B is 3.2D and its Bond length is 10 pm.Find the percentage ionic character in the molecule.

Q. 78. "In Benzene, the bond energy of C-C increases due to π electrons of C=C" Explain

Q. Cyclohexane, a hydrocarbon floats on water because (a) it is immiscible with water (b) its density is low as compared to water (c) it is non-polar substance (d) it is immiscible and lighter than water

Q. H2O is a liquid where as H2S is a gas. Why?