Introduction to Aromatic Compounds

Q.

Write the chemical formula for Blue vitriol.

Q.

How do you prepare Hydrogen sulfide$\left({\mathrm{H}}_2\mathrm{S}\right)$?

Q. Identify the element that cannot be detected by Lassaigne’s test.

1. Nitrogen
2. Fluorine
3. Sulfur
4. Phosphorous

Q. What is the color of the precipitate obtained in the test for sulphur?

1. White
   
2. Black
3. Violet
4. Blue

Q.

The Chemical Formula of White Vitriol Is

Q.

What is the chemical formula for manganese (IV) sulfate?

Q.

Nitrogen is relatively inactive element because:

Q.

Write the chemical formula for the heptahydrate of Iron (II) sulphate.

Q. During sodium extract preparation for Lassaigne's test both N and S present in an organic compound change to:

1. $NaCN$ and $N{a}_{2}S$
2. $NaN{H}_2$ and $N{a}_{2}S{O}_4$
3. $NaSCN$
4. $NaN{O}_3$ and $N{a}_{2}S$

Q.

Aromatic hydrocarbons are also known as__________.

Q. Which method is used method to purify solid organic compounds ?

1. Crystallization
2. Steam Distillation
3. Distillation Under Reduced Pressure
   
4. None of the above

Q. The presence of carbon in an organic compound is detected by heating it with:

1. Sodium metal to convert it to $NaCN$
2. $CaO$ to convert it into $CO$ which burns with a blue flame
3. $CuO$ to convert it into $C{O}_2$ which turns lime water milky
4. $Cu$ wire to give a bluish-green flame

Q. The principle behind purification by crystallisation is that the:

1. amount of solute that can be dissolved by a solvent increases with temperature
2. amount of solute that can be dissolved in a solvent decreases with increase in temperature
3. both a and b
4. none of above

Q.

Which of these salts on strong dry heating evolves a mixture of colourless gases?

1. ${\mathrm{CaCO}}_3$

2. $\mathrm{Pb}{\left({\mathrm{NO}}_3\right)}_2$

3. ${\mathrm{FeSO}}_4$

4. ${\mathrm{KClO}}_3$

Q. Carbon and hydrogen in an organic compound are detected as:

1. $MgC{O}_3,anhyd.CuS{O}_4$
2. $CaC{O}_3,CuS{O}_4.5H_{2}O$
3. $CaC{O}_3,Cu(OH{)}_2$
4. $CaO,CaC{O}_3$

Q.

Name the following.

The compound is formed by the reaction between calcium oxide and silica.

Q. An aromatic compounds among other things should have a $(4n+2)$ $\pi -$ electron cloud, where $n$ can't be:

1. $\frac{1}{2}$
2. $3$
3. $2$
4. $1$

Q. Dumas and Kjeldahl's methods are used for the quantitative estimation of:

1. Phophorous
2. Halogens and Sulphur
3. Nitrogen
4. All of the above.

Q. A violet colour with sodium nitroprusside in the test of sulphur in an organic compound is due to the formation of:

1. $N{a}_4\left[Fe\right(CN{)}_{6}NO]$
2. $N{a}_4\left[Fe\right(CN{)}_{5}NOS]$
3. $N{a}_3\left[Fe\right(CN{)}_{5}NS]$
4. $F{e}_4\left[Fe\right(CN{)}_6{]}_3$

Q. Identify the correct statement which is related to aromatic hydrocarbon

1. It has only sigma bonds
2. It has only pi bonds
3. It has sigma and two pi bonds
4. It has sigma and delocalized pi bond

Q. What will happen if too much solvent is added to the sample during crystallization?

1. The recovery of pure sample increases
2. The recovery of pure sample decreases
3. The recovery of pure sample takes place at a faster rate
4. No change in the recovery of pure sample

Q. The correct IUPAC name of the following structure is :

1. 1-hydroxy-hex-4-(eth-2-enyl)-enoate
2. None of the above
3. 1-hydroxy-3-(3-methoxypropyl)-pent-4-enoate
4. Methyl-3-(3-hydroxypropyl)-pent-4-enoate

Q.

Which of the following are functional isomers of?

1. 

2. 

3. Both (a) & (b)

4. Neither (a) nor (b)

Q. The presence of carbon in an organic compound is detected by heating it with:

1. Sodium metal to convert it to $NaCN$
2. $CaO$ to convert it into $CO$ which burns with a blue flame
3. $CuO$ to convert it into $C{O}_2$ which turns lime water milky
4. $Cu$ wire to give a bluish-green flame

Q. Name the chromatography which is based on continous differential partitioning of components of a mixture between the stationary and the mobile phase.

1. Partition chromatography
2. Descending chromatography
3. Column chromatography
4. Adsorption chromatography

Q.

How is Benzene diazonium chloride converted to Benzene?

1. 

2. 

3. 

4. Both (b) & (c)

Q. Name the chromatography which is based on continous differential partitioning of components of a mixture between the stationary and the mobile phase.

1. Partition chromatography
2. Descending chromatography
3. Column chromatography
4. Adsorption chromatography

Q. The principle of column chromatography is :

1. Capillary action
2. Gravitational force
3. difference in the boling point of various substances
4. Differential adsorption of the various substances on the stationary phase

Q. The substance which can be used as adsorbent in column chromatography is:

1. $N{a}_{2}O$
2. $N{a}_{2}S{O}_4$
3. $A{l}_2{O}_3$
4. NaCl

Q. Dumas and Kjeldahl's methods are used for the quantitative estimation of:

1. Phophorous
2. Halogens and Sulphur
3. Nitrogen
4. All of the above.