Preparation of Alkyl Halides

Q.

Balance the reaction using half reaction method

$Mn{O}_4^{-}$ $+$ $S{O}_4^{2-}$ $⟶$ $M{n}^{2+}$ $+$ $HS{O}_4^{-}$

Q.

A hydrocarbon ${\mathrm{C}}_5{\mathrm{H}}_{10}$does not react with chlorine in dark but gives a single monochloro compound ${\mathrm{C}}_5{\mathrm{H}}_9\mathrm{Cl}$ in bright sunlight. Identify the hydrocarbon.

Q.

Finkelstein reaction for the preparation of alkyl iodide is based upon the fact that

1. Sodium iodide is soluble in methanol, while sodium chloride is insoluble in methanol

2. Sodium iodide is soluble in methanol, while NaCl and NaBr are insoluble in methanol

3. Sodium iodide is insoluble in methanol, while NaCl and NaBr are soluble

4. The three halogens differ considerably in their electronegativity

Q. Sodium benzoate on heating with soda lime gives :

1. Benzene
2. Sodium bicarbonate
3. Sodium hydroxide
4. (a) and (b) above.

Q. The reagents required to obtain 1-iodobutane from 1-butene is/are

1. I₂/red P
2. KI
3. HBr/H₂O₂ and KI/acetone
4. HI/H₂O₂

Q.

What is the major Product of Nitration of Toulene?

Q. In which of the following reaction aromatic aldehyde is treated with acid anhydride in presence of corresponding salt of the acid to give unsaturated aromatic acid.

1. Friedel-Craft's reaction
2. Perkin reaction
3. Wurtz reaction
4. None of these

Q. Which of the following compounds will produce a precipitate with $AgN{O}_3$ ?

1. 
2. 
3. 
4. 

Q. Which of the following alkyl halides is hydrolysed by $S_{N}1$ mechanism most easily?

1. $$C{H}_{3}Cl$$
2. $$C{H}_{3}C{H}_{2}Cl$$
3. 
   $$C{H}_{3}C{H}_{2}C{H}_{2}Cl$$
4. $$(C{H}_3{)}_{3}CCl$$

Q. In Finkelstein reaction when acetone is replaced by water then

1. Reaction occur in forward direction via $S_{N}1$ pathway
2. Reaction occur in forward direction via $S_{N}2$ pathway
3. Reaction occur in backward because $NaCl$ formed in right hand side is soluble in water and cannot precipitate out
4. Reaction occur in forward because $NaCl$ formed in right hand side is soluble in water and can precipitate out

Q. Which of the following reacts with $NaN{O}_2+HCl$ followed by warming with water to give phenol?

1. $C_6{H}_{5}C{H}_{2}NHC{H}_3$
2. $(C{H}_3{)}_{2}NH$
3. $C{H}_{3}N{H}_2$
4. $C_6{H}_{5}N{H}_2$

Q. Reaction of $C{l}_2$ with excess of $F_2$ at $573K$ will give

1. $ClF$
2. $Cl{F}_2$
3. $Cl{F}_3$
4. $Cl{F}_4$

Q.

The slaking of lime is an endothermic change.

1. True
2. False

Q.

A hydrocarbon $C_5{H}_{10}$ does not react with chlorine in dark but gives a single monochloro compound $C_5{H}_{9}Cl$ in bright sunlight. Identify the hydrocarbon.

Q.

Which of the following statements is/are correct?

1. A chemical equation tells us about the substances involved in a reaction.

2. A chemical equation informs us about the symbols and formulae of the substances involved in a reaction.

3. A chemical equation tells us about the atoms or molecules of the reactants and products in a reaction.

4. All are correct.

Q. The number of geometrical isomers of $C{H}_3-CH=CH-CH=CH-CH=CH-C{H}_3$ is

1. 4
2. 5
3. 6
4. 3

Q. $C{H}_2=CH-N{O}_2+HBr\to P$; The major product ${}^{\prime }{P}^{\prime }$ is:

1. 
2. 
3. 
4. 

Q. What is saytzeff Rule ?

Q. Balance the equation Potassium bromide + Barium iodide = Potassium iodide + Barium chloride

Q.

Give an example of a chemical change in which heat is liberated.

Q. Phenol is obtained by heating aqueous solution of :

1. aniline
2. benzene diazonium chloride
3. benzoic acid
4. none of the above

Q. Preparation of alkyl halides in laboratory is least preferred by

1. Halide exchange

2. Direct halogenation of alkanes

3. Treatment of alcohols
4. Addition of hydrogen halides to alkenes

Q.

Groves method is used for the preparation of alkyl halides from alcohols using $\mathrm{HX}$ and ${\mathrm{ZnCl}}_2$. The order of reactivity is :

1. $\mathrm{HCl}>\mathrm{HBr}>\mathrm{HI}$

2. $\mathrm{HI}>\mathrm{HBr}>\mathrm{HCl}$

3. $\mathrm{HCl}>\mathrm{HI}>\mathrm{HBr}$

4. $\mathrm{HI}>\mathrm{HCl}>\mathrm{HBr}$

Q.

1. True
2. False

Q.

The chemical reaction in which heat is released is called __________ reaction.

Q. The starting substance for the preparation of $C{H}_{3}I$ is

1. $C{H}_{3}OH$
2. $C_2{H}_{5}OH$
3. $C{H}_{3}CHO$
4. $(C{H}_3{)}_{2}CO$

Q. identify the product A and B in the equation 2Na+2H₂O=A+B

Q. When (S)-2-bromopentane is brominated, several 2, 3-dibromopentane molecules are formed. Which of the following is not formed?

1. 
2. 
3. 
4. 

Q.

NaOH + Ca(OH)2 =

Plz explain

What it will give and balance eqn

Q. Balance thr rxn Explain each step N2H4+AgNO3+KOH---N2+Ag+KNO3+H2O