Question
How will you bring about the following conversion?
Ethane to bromoethene.
Ethane to bromoethene.
✓
Answer
Ethane to bromoethene.
$\text{HC}_3-\text{HC}_3\xrightarrow[\text{or heat}]{\text{Br}_2/\text{UV light}}\text{CH}_3-\text{CH}_2\text{Br}+\text{HBr}\ \\ \text{Ethane}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Bromoethane}\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ -\text{HBr}\Bigg\downarrow\text{KOH(alc),}\Delta\\ \ \ \text{BrCH}_2-\text{CH}_2\text{Br}\xleftarrow{\text{Br}_2/\text{CCl}_4}\text{CH}_2\equiv\text{CH}_2\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ \ \ \text{vic-Dibromide}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Ethene}\\ \ \ \ \ \Delta\Bigg\downarrow\text{KOH(alc)}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ \ \ \text{CH}_2= \text{CHBr}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ \ \ \text{Bromoethane}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ $
$\text{HC}_3-\text{HC}_3\xrightarrow[\text{or heat}]{\text{Br}_2/\text{UV light}}\text{CH}_3-\text{CH}_2\text{Br}+\text{HBr}\ \\ \text{Ethane}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Bromoethane}\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ -\text{HBr}\Bigg\downarrow\text{KOH(alc),}\Delta\\ \ \ \text{BrCH}_2-\text{CH}_2\text{Br}\xleftarrow{\text{Br}_2/\text{CCl}_4}\text{CH}_2\equiv\text{CH}_2\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ \ \ \text{vic-Dibromide}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Ethene}\\ \ \ \ \ \Delta\Bigg\downarrow\text{KOH(alc)}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ \ \ \text{CH}_2= \text{CHBr}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ \ \ \text{Bromoethane}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ $
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The reaction between $A$ and $B$ is first order with respect to $A$ and zero order with respect to $B$. Fill in the blanks in the following table:
→| Experiment | $[A]/mol\ L^{-1}$ | $[B]/mol\ L^{-1}$ | Initial rate/mol $L^{-1}\ min^{-1}$ |
| $I$ | $0.1$ | $0.1$ | $2.0 \times 10^{-2}$ |
| $II$ | $-$ | $0.2$ | $4.0 \times 10^{-2}$ |
| $III$ | $0.4$ | $0.4$ | $-$ |
| $IV$ | $-$ | $0.2$ | $2.0 \times 10^{-2}$ |
Name the members of the lanthanoid series which exhibit +4 oxidation states and those which exhibit +2 oxidation states. Try to correlate this type of behaviour with the electronic configurations of these elements.
Define aluminothermy.
What are essential and non-essential amino acids? Give two examples.
A first order reaction takes 20 minutes for 25% decomposition. Calculate the time when 75% of the reaction will be completed. (Given : log 2 = 0·3010, log 3 = 0·4771, log 4 = 0·6021)
Answer the following:
$(a)$ What is the order of photochemical reaction?
$(b)$ For the homogeneous decomposition of $N _2 O _5$ into $NO _2$ and $O _2 ; 2 N_2 O _5(g) \rightarrow 4 N O_2(g)+O_2(g)$
Rate $= k \left[ N _2 O _5\right]$
Find out the order of reaction with respect to $N _2 O _5$.
→$(a)$ What is the order of photochemical reaction?
$(b)$ For the homogeneous decomposition of $N _2 O _5$ into $NO _2$ and $O _2 ; 2 N_2 O _5(g) \rightarrow 4 N O_2(g)+O_2(g)$
Rate $= k \left[ N _2 O _5\right]$
Find out the order of reaction with respect to $N _2 O _5$.
Unlike dry cell, the mercury cell has a constant cell potential throughout its useful life. Why?
Give a chemical test to distinguish between the following pairs of compounds.
Write the chemical equation for the following conversion (not more than 2 steps):
Acetone to propene.
Acetone to propene.
The osmotic pressure of sugar solution is 2.46 atm at 27°C. Calculate the concentration of the solution.