Reaction with Diazonium Salts

Q. Ortho & para hydrogen differ in

1. Mass number
2. Electron spin in two atoms
3. Nuclear spin in two atoms
4. Atomic number

Q.

State necessary conditions for a chemical reaction to take place.

Q.

Write the balanced chemical equation for the following.

Nitric acid is added to Calcium carbonate

Q.

$\mathrm{DDT}$ Can Be Prepared By Reacting Chlorobenzene In The Presence Of Conc ${\mathrm{H}}_2{\mathrm{SO}}_4$ With____.

Q. In nitration of benzene using conc. $H_{2}S{O}_4$ and conc. $HN{O}_3,$ the role of nitric acid is as

1. an acid
2. a base
3. a reducing agent
4. an oxidising agent

Q. When nitrobenzene is treated with $B{r}_2$ in presence of $FeB{r}_3$, the major product formed is $m-$ bromonitrobenzene. Statements which are related to the formation of $m-$isomer are:

1. The electron density on meta carbon is more than that on ortho and para positions
2. The intermidiate carbonium ion formed after initial atack of $B{r}^{+}$ at the meta position is least destabilised
3. Loss of aromaticity when $B{r}^{+}$ attacks at the ortho and para positions and not at meta position
4. Easier loss of $H^{+}$ to regain aromaticity from the meta position than from ortho and para positions

Q.

Write balanced chemical equation for the reaction of magnesium with dilute sulfuric acid.

Q.

When benzaldehyde is nitrated we get:

1. p-Nitrobenzaldehyde

2. o-Nitrobenzaldehyde

3. m-hydroxybenzaldehyde

4. m-Nitrobenzaldehyde

Q.

What is the name of the third member of the alkene homologous series?

Q. For a complex reaction _______________

1. order of overall reaction is greater than molecularity of the slowest step.
2. order of overall reaction is same as molecularity of the slowest step.
3. order of overall reaction is less than the molecularity of the slowest step.
4. Molecularity of the slowest step is never zero or non-integer.

Q. Carbylamine test is used to detect the presence of primary amino group in an organic compound. Which of the following compound is formed when this test is performed with aniline ?

1. 
2. 
3. 
4. 

Q.

What are the products formed when anisole reacts with HI?

1. 

2. 

3. 

4. 

Q.

Balance the following unbalanced reaction:

$\mathrm{PbS}+{\mathrm{H}}_2{\mathrm{O}}_2\to {\mathrm{PbSO}}_4+{\mathrm{H}}_2\mathrm{O}$

Q. How to chemically distinguish between Chlorobenzene and Cyclohexyl chloride?

Q.

Write the balanced chemical equation for the following.

Concentrated Nitric acid is added to Potassium iodide.

Q. The reagent with which both acetaldehyde and acetone react easily is

1. Fehling's reagent
2. Grignard reagent
3. Schiff's reagent
4. Tollen's reagent

Q.

Write word equation for the following reaction:

Reaction ammonia gas with hydrogen chloride gas.

Q.

When ammonia gas reacts with hydrochloric acid gas, the ammonium chloride is formed which is in

1. Liquid state

2. Solid-state

3. Gaseous state

4. partly solid and partly gaseous

Q.

In whitewashing of walls, soluble slaked lime [Ca(OH)₂] is used. But the product on the walls is insoluble in water. Can you suggest the chemical change which occurs on the walls? Name the type of reaction.

Q. The conjugate base of $(HC{O}_3{)}^{-}$ is-

1. H₂CO₃
2. (CO₃)^2-
3. CO₂
4. H₂O

Q.

The second member of homologous series of alkenes is

1. ethene

2. propene

3. butene

4. ethyne

Q.

Fill In Blanks With Collective Nouns

A ______ Of Players .

Q. When chloroform reacts with ethylamine in presence of alc. $KOH$, the compound formed is:

1. ethyl cyanide
2. ethyl isocyanide
3. formic acid
4. phosgene

Q. When hydrochloric acid gas is treated with propene in presence of benzoyl proxide, it gives:

1. 2-Chloropropane
2. Allyl chloride
3. n-Propyl chloride
4. None of the above

Q.

The reaction of following with ${\mathrm{H}}_3{\mathrm{N}}_3{\mathrm{B}}_3{\mathrm{Cl}}_3$(A) within${\mathrm{LiBH}}_4$ in tetrahydrofuran gives inorganic benzene (B), Then (A) reacts with (C) forming${\mathrm{H}}_3{\mathrm{N}}_3{\mathrm{B}}_3{\left(\mathrm{Me}\right)}_3$. Compounds (B) and (C) are

1. Borazine and $\mathrm{MeBr}$

2. Boron nitride and $\mathrm{MeBr}$

3. Borazine and $\mathrm{MeMgBr}$

4. Diborane and $\mathrm{MeMgBr}$

Q.

The burning of a piece of magnesium wire is a synthesis reaction.

1. True
2. False

Q.

Define endothermic change with an example.

Q.

How do you solve enthalpy problems?

Q. Enthalpy diagram for a particular reaction is given in Figure. Is it possible to decide spontaneity of a reaction from given diagram? Explain.

Q. Phenol is not obtained by:

1. 
2. 
3. 
4.