Introduction to Organic Chemistry

Q. What is a homologous series? Explain with an example.
[2 Marks]

Q.

Which of the following properties are shown by simple hydrocarbons with 4-5 carbon atoms?

1. Low melting point

2. Combustibility

3. Isomerism

4. Low boiling point

Q.

Why do isomeric branched alkanes normally exhibit lower boiling points than unbranched alkanes of the same carbon content?

1. Normal alkanes have greater Van der Waal forces

2. Branched alkanes have greater Van der Waal forces

3. Branched alkanes have lesser Van der Waal forces

4. Branched alkanes have greater repulsive forces

Q.

The molecular mass of any two homologues differ by?

1. 12

2. 14

3. 16

4. 15

Q.

What specific characteristic of alkane is suggested when their vapors, cause severe damage to lung tissue by dissolving the fatty material in cell membranes?

1. Alkanes dissolve fully in water

2. Alkanes dissolve partially in water

3. Alkanes dissolve in non-polar organic solvents

4. Alkanes dissolve slightly in non-polar organic solvents

Q.

The general formula of alkenes is:

1. $C_n{H}_{2n}$

2. $C_n{H}_{2n+2}$

3. $C_n{H}_{2n+4}$

4. $C_n{H}_{2n-2}$

Q.

Why do solid alkanes have low melting point?

1. Weak repulsive forces between electrons of neighboring atoms

2. Strong repulsive forces between electrons of neighbouring atoms

3. Weak attractive forces between electrons of neighboring atoms

4. Strong attractive forces between electrons of neighboring atoms

Q.

Select the correct range of carbon atoms of alkene series which are liquid.

1. 6 to 16 number of carbon atoms

2. 5 to 10 number of carbon atoms

3. 5 to 15 number of carbon atoms

4. 6 to 15 number of carbon atoms

Q.

What do we call the formula which gives us the relative arrangements of bonded atoms in a molecule?

1. Functional series formula

2. Homologous series formula

3. Structural formula

4. Condensed formula

Q.

What is the reason behind alkane's insolubility in water?

1. Dipole-dipole forces in water is lesser than Van der Waal force of alkanes and water

2. Dipole-dipole forces in water is greater than Van der Waal force of alkanes and water

3. Van der Waal forces in water is greater than Van der Waal force of alkanes and water

4. Dipole-dipole forces of water is greater than dipole force of alkanes and water