Introduction to Organic Chemistry

Q.

Which of the following is an organic compound?

1. 

2. 

3. 

4. 

Q.

What are the types of organic compounds?

Q. Question 9
Why are carbon and its compounds used as fuel for most applications?

Q.

In general, covalent compounds

1. ionise in water

2. are hydrophilic

3. are insoluble in water

4. are soluble in water

Q.

Difference between polar and non-polar solvent.

Q.

Write the name and general formula of (1) saturated hydrocarbons, (2) unsaturated hydrocarbons and draw the structure of one hydrocarbon of each type.

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.

Organic compounds composed of only carbon and hydrogen are called hydrocarbons.

False

True

Q.

The formula of ethyne is:

1. ${\mathrm{C}}_2{\mathrm{H}}_2$

2. ${\mathrm{C}}_6{\mathrm{H}}_6$

3. ${\mathrm{C}}_2{\mathrm{H}}_4$

4. ${\mathrm{C}}_2{\mathrm{H}}_6$

Q. A solution of ethanol in water is 10 % by volume. If the solution and pure ethanol have densities of 0.9866 g/cc and 0.785 g/cc respectively. The percent by weight is nearly ? 1) 7.95 % 2) 17 % 3) 9.86 % 4) 16.2 %

Q.

The molecular mass of any two homologues differ by?

1. 14

2. 16

3. 12

4. 15

Q.

Which of the following is/are tetravalent?

1. catenation

2. Nitrogen

3. Oxygen

4. Silicon

Q.

Open-chain saturated hydrocarbons are called___.

1. Paraffin

2. Alkyl groups

3. Alkenes

4. Alkynes

Q. What are polar and non polar solvents ? Differentiate between them

Q.

In general, alkenes are not used as common fuels.

1. True

2. False

Q. Statement 1 (S1): A nitrogen molecule has a triple bond.
Statement 2 (S2): A bond formed by sharing of three electrons between two atoms is known as a triple bond.

1. Both S1 and S2 are false
2. Both S1 and S2 are true
3. S1 is true but S2 is false
4. S1 is false but S2 is true

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. The simplest alkyne from the following is:

1. Ethene
2. Ethylene
3. Acetylene
4. Ethyl

Q.

What type of hydrocarbon is Kerosene ?

Q. arrange methane, ethane, propane and butane in order of increasing melting point considering alternation effect?

Q.

Which of the following property is shown by covalent compounds?

1. Exist as crystalline solids

2. Soluble in water

3. Soluble in organic solvents

4. Good conductors of electricity

Q. Which of the following is not true regarding the structural isomerism?

1. The bonds between the molecules and the relative positions remain the same.
2. Sometimes a new atom may be introduced, so the number of atoms might change.
3. The functional group is always the same.
4. The functional group might change.

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. Strong attractive forces between electrons of neighboring atoms

4. Weak attractive forces between electrons of neighboring atoms

Q.

How can you identify a hydrocarbon from its name?

Q. Which of the following is a common characteristic of a covalent compound ?

1. Consists of molecules
2. High melting point
3. Conducts electricity when it is in the molten state
4. Always soluble in water

Q. Among the following compounds how many is(are)unstable at room temperature in their pure form?

Q. What are hydrocarbons? Compare saturated and unsaturated hydrocarbons. [4 MARKS]

Q.

Which substance has the highest thermal conductivity

Q. The structure given below represents:

1. Quarternary ammonium salt
2. Primary amine
3. Secondary amine
4. Tertiary amine

Q. was the first artificially synthesised organic compound.

1. Urea
2. Ethanol
3. Acetic acid