Chemical Properties of Alkanes

Q.

Write the equation to represent the combustion of propane.

Q.

Write the chemical equation of the reaction which takes place on burning ethanol in air.

Q. Reactivity of hydrogen atoms attached to different carbon atoms in alkanes has the order:

1. Tertiary > Primary > Secondary
2. Primary > Secondary > Tetriary
3. Both (a) and (b)
4. Tetriary > Secondary > Primary

Q. The increasing order of the reactivity of the following compund in nucleophilic addition reaction is : Propanal, Benzaldehyde, Propanone, Butanone

1. $\text{Benzaldehyde < Propanal < Propanone < Butanone}$
2. $\text{Propanal < Propanone < Butanone < Benzaldehyde}$
3. $\text{Butanone < Propanone < Benzaldehyde < Propanal}$
4. $\text{Benzaldehyde < Butanone < Propanone < Propanal}$

Q. find the product and type of reaction shown by m-bromo anisole and NaNH2

Q.

${\mathrm{Cu}}^{2+}$ salts react with $\mathrm{KI}$ and forms:

1. ${\mathrm{Cu}}_2{\mathrm{I}}_2$

2. $\mathrm{CuI}$

3. $\mathrm{Cu}{\left({\mathrm{I}}_3\right)}_2$

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

Q. In the following redox reaction $C{r}_2{O}_7^{2-}+F{e}^{2+}\to F{e}^{3+}+C{r}^{3+}$ One mole of $C{r}_2{O}_7^{2-}$ oxidises?

1. 1 mole of $F{e}^{2+}$
2. 3 mole of $F{e}^{2+}$
3. 4 mole of $F{e}^{2+}$
4. 6 mole of $F{e}^{2+}$

Q. when any halogen is attached with a benzene ring, it shows inductive effect rather than mesomeric effect so will it be correct to state that halogen does not show mesomeric effect?

Q. In which of the following reactions the product will be formed according to anti markovnikov rule :

1. $C{F}_{3}CH=C{H}_2\stackrel{HCl}{\to }$
2. $ClCH=C{H}_2\stackrel{HCl}{\to }$
3. $C{H}_{3}OCH=C{H}_2\stackrel{HCl}{\to }$
4. None

Q. Choose the correct major product

1. Meso
2. Racemic
3. Enantiomer
4. Diastereomer

Q.

For a gas phase reaction ${\mathrm{Cl}}_2+{\mathrm{CHCl}}_3\to \mathrm{HCl}$ $+{\mathrm{CCl}}_4$, the rate law is given as $\mathrm{r}=\mathrm{K}{\left[{\mathrm{Cl}}_2\right]}^{1/2}$ $\left[{\mathrm{CHCl}}_3\right]$. Explain how the rate of reaction varies when the concentration of chlorine is doubled. Give units of rate constant.

Q. Nitrobenzene on electrolytic reduction in weak acidic medium will give

1. Phenylhydroxylamine​
2. p-Aminophenol​
3. m-Aminophenol​
4. Aniline

Q.

Total number of $\alpha$-hydrogen in the final major product is:

1. $6$
2. $8$
3. $10$
4. $11$

Q. The sum of the oxidation numbers of all the carbons in $C_6{H}_{5}CHO$ is

1. 2
2. 0
3. 4
4. -4

Q. In the following reaction, compound Q is obtained from compound P via an ionic intermediate.What is the degree of unsaturation of $Q$ ?

Q. The decreasing order of heat of hydrogenation of the alkenes mentioned in the given compound is:

1. (c) > (b) > (a)
2. (c) > (a) > (b)
3. (a) > (b) > (c)
4. (b) > (a) > (c)

Q. When a sulphur atom becomes a sulphide ion

1. There is no change in the composition of atom
2. It gains two electrons
3. The mass number changes
4. None of these

Q.

Why is free radical substitution generally not suitable for laboratory preparation of haloalkanes?

1. Because it is very expensive

2. Because a mixture of isomers are formed which are difficult to separate

3. Because free radical substitution occurs in drastic temperature and pressure conditions.

4. None of the above

Q. Equivalent mass of Mohr salt in acid medium is (molar mass = 392):

1. 278
2. 392
3. 96
4. 200

Q.

The probability factor for the replacement of hydrogen atom during chlorination/bromination is

1. more important in bromination
   

2. more important in chlorination
   

3. not definite

4. equally important in chlorination/bromination
   

Q. Which one of the following reactions does not involve either oxidation or reduction

1. $V{O}_2^{+}\to V_2{O}_3$
2. $Na\to N{a}^{+}$
3. $Cr{O}_4^{2-}\to C{r}_2{O}_7^{2-}$
4. $Z{n}^{2+}\to Zn$

Q. Which of the following compounds will not undergo Friedal-Crafts reaction easily?

1. 
2. 
3. 
4. 

Q. Which group does not contain transition metals ?

1. Group 5
2. Group 7
3. Group 11
4. Group 13

Q. Which one of the following compounds gives methane on treatment with water?

1. VC
2. $Ca{C}_2$
3. $A{l}_4{C}_3$
4. SiC

Q. Whch is another useful byproduct produced by Stephen reaction other than aldehyde?

1. Potassium chloride
2. Ammonium chloride
3. Calcium chloride
4. Sodium Chloride

Q.

Combustion can be considered as

1. oxidation

2. reduction

3. decomposition

4. all of these

Q.

The number of oxygen molecules used in the combustion of 1 molecule of ethanol is

1. 1

2. 2

3. 3

4. 4

Q. Which of the following compound has highest boiling point?

1. $n-hexane$
2. $2,3$$-dimethylbutane$
3. $2,2$$-dimethylbutane$
4. $2$$-methylbutane$

Q. In the following reaction, $S{O}_2$ acts as a reducing agent $S{O}_2+C{l}_2+2H_{2}O\to H_{2}S{O}_4+2HCl$ . The equivalent weight of $S{O}_2$ will be

1. 64
2. 32
3. 16
4. 8

Q.

Which of the following reaction can be used for the synthesis of alkene

1. Chugaev reaction

2. Dakin reaction

3. riemer – tiemann

4. wurtz – fittig