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Alcohols, Phenols and Ethers — Chemistry STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryAlcohols, Phenols and Ethers2 Marks
Question
What is metamerism? Explain metamerism with suitable examples of ethers.
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Answer

The ethers with the same molecular formula but different alkyl groups attached on either side of the oxygen atom are called metamers of each other, and the phenomenon is called metamerism.
The property in which ethers have same molecular formula but different alkyl groups in their structures is called metamerism and the isomers obtained are called as metamers.
Examples :
e.g. $C_2H_5 - O - C_2H_5 -$ Diethyl ether;
$CH_3 - O - C_3H_7 -$ Methyl $n-$propyl ether
In the above example both ethers are having same molecular formula i.e. $C_4H_{10}$ but different alkyl groups in their structure, so they are metamers of each other.

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(a) Given: $2 NO _{2( g )}+ F _{2( g )} \rightarrow 2 NO _2 F$
Rate $= k \left[ NO _2\right]\left[ F _2\right]$
Hence the reaction is first order with respect to $NO _2$ and first order with respect to $F _2$
$\therefore$ Order of reaction $= n _{ NO 2}+ n _{ F 2}=1+1=2$

(b) Given :
$\begin{aligned}
& CHCl _{3( g )}+ Cl _{2( g )} \rightarrow CCl _{4( g )}+ HCl _{( g ),} \\
& \text { Rate }= k \left[ CHCl _3\right]\left[ Cl _2\right]^{1 / 2}
\end{aligned}$
Hence the reaction is first order in $CHCl _3$ and half order in $Cl _2$.
$\therefore$ Order of reaction
$= n _{ CHCl3 }+ n _{ Cl 2}=1+\frac{1}{2}=\frac{3}{2}$

(a) Order of the reaction $=2$
(b) The order of the reaction $=\frac{3}{2}$
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