Physical Properties of Aromatic Compounds

Q. Identify all the possible monochloro structural isomers expected to be formed on free radical monochlorination of
$(C{H}_3{)}_{2}CHC{H}_{2}C{H}_3.$

Q.

Why does cloromethane(CH3Cl) have more dipole moment than chloroform (CHCl3)?

Q.

The functional group present in propanal is ___________.

1. $-\mathrm{OH}$

2. $-\mathrm{COOH}$

3. $-\mathrm{CO}-$

4. $-\mathrm{CHO}$

Q. Derive the structure of
(i) $2-\text{Chlorohexane}$
(ii) $\text{Pent-4-en-2-ol}$
(iii) $3-\text{Nitrocyclohexene}$
(iv) $\text{Cyclohex-2-en-1-ol}$
(v) $6-\text{Hydroxyheptanal}$

Q. The decreasing order of bond length of $C=C$ bond in the following compounds is:

1. II > I > IV > III
2. III > I > II > IV
3. IV > II > I > III
4. IV > I > II > III

Q. Why is benzene extraordinarily stable though it contains 3 double bonds?

Q.

Which of the following has the least electron affinity?

1. Oxygen

2. Argon

3. Nitrogen

4. Boron

Q.

What energy is required to break the bonds?

Q.

State three important characteristics of a molecule.

Q.

What is the difference between bond energy and bond enthalpy

Q. Out of the following three solutions which has the highest freezing point and why? 1) 0.1 M urea 2) 0.1 M barium phosphate 3) 0.1 M sodium sulphate But as freezing point is a colligative property and number of particles of in 3 solutions are equal then all three should have same freezing point. how

Q. Identify allylic alcohols in the given examples.

A
B
C
D
E
F

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.

Write the IUPAC names of the following:

${\mathrm{CH}}_3-\mathrm{CO}-{\mathrm{CH}}_3$

Q.

In a room temperature, N₂ is less reactive. Explain why?

Q. Correct $IUPAC$ name for

1. 2-sec-butylbutane

2. 2-ethyl-3-methylpentane

3. 2, 3-dimethylbutane

4. 3, 4-dimethylhexane

Q.

Which will have greater electron affinity, Oxygen or Fluorine?

Q. Which of the following is amorphous

1. Polystyrene
2. Table salt
3. Diamond
4. Silica

Q.

Why is Nitrogen Explosive?

Q.

What is the role of ionization potential and electron affinity of the elements in the formation of ionic and covalent bonds?

Q.

7. (c) What is a functional group? Give examples of four different functional groups.

Q.

Name the functional group present in the following compound.

${\mathrm{CH}}_3{\mathrm{COCH}}_2{\mathrm{CH}}_2{\mathrm{CH}}_2{\mathrm{CH}}_3$

Q. Paraffins are soluble in

1. water
2. Benzene
3. seawater
4. Methanol

Q.

Name the functional group present in the following compound.

${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{COOH}$

Q. Which of these is incorrect and correct Explain with reasons 1. If there is conjugation between triple bond and double bond then pi-bonds of triple bond are in conjugation with double bond 2.antiaromatic compounds are unstable but resonance is present 3.NBS is specific reagent for allylic bromination 4.allylic bromination occurs through free radical intermidiates 5.the density of alkanes os lower than water

Q.

The functional group present in ${\mathrm{CH}}_3{\mathrm{COOC}}_2{\mathrm{H}}_5$ is-

1. ketonic

2. aldehydic

3. ester

4. carboxylic

Q.

The decreasing order of electron affinity of F, CI, Br is F > CI > Br.

1. True
2. False

Q. if dipole moment of a molecule A-B is 3.2D and its bond length is 10pm, find the %ionic character in the molecule.

Q. The number of benzylic hydrogen atoms in ethylbenzene is

1. 3
2. 5
3. 2
4. 7

Q. Choose the correct statement(s) regarding physical properties of arenes :

1. They exist in solid or liquid state
2. Aromatic hydrocarbons are colourless.
3. Aromatic hydrocarbons are odourless.
4. They are miscible with water but immiscible in non-polar solvents.