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Chemistry 2 Marks Questions

Alcohols, Phenols and Ethers · CBSE STD 12 Science (CBSE - English Medium). 5 questions.

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2 Marks Questions

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Question 12 Marks
When mixed ethers in which primary or secondary alkyl group is present is treated with one mole of HI , the iodide ion $\left( I ^{-}\right)$goes to which alkyl group and why?
Answer
When mixed ether containing primary or secondary alkyl group reacts with HI, then the iodide ion goes to that alkyl group of the ether which is simpler and less steric hindrance. Due to the large size of iodide ion, it does not attached with larger or more substituted alkyl group.
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Question 22 Marks
Name the product formed by the reaction of $CH _3 OC _2 H _5$ with HI.
Answer
(i) $CH _3 OC _2 H _5+ HI \longrightarrow CH _3 OH + C _2 H _5 I$
(ii) $CH _3 OC _2 H _5+\underset{\text{excess}}{2 HI} \longrightarrow CH _3 I + C _2 H _5 I + H _2 O$
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Question 32 Marks
Write the reaction of $t-$butyl methyl ether with conc. $HI$ and also explain its mechanism.
Answer

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Mechanism of this reaction is $S_N1.$
For mechanism see section $7.6.3. (a) (8)-$Chemical properties of ether.
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Question 52 Marks
An organic compound $X \left( C _4 H _{10} O \right)$ reacts with HCl giving a compound $Y \left( C _4 H _9 Cl \right)$ which on reduction gives butane. Oxidation of compound $X$ gives carbonyl compound $Z$ and then the carboxylic acid of the same number of carbons formed. Give the formula of $X, Y, Z$ and $P$ and also write the reaction sequence.
Answer
Compound X is $n$-butyl alcohol, because the end product of $n$-butyl alcohol is a carboxylic acid of the same number of carbons. The eqaution of these reactions are as follows :
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2 Marks Questions - Chemistry STD 12 Science Questions - Vidyadip