What are the products of the following reactions?
What are the products of the following reactions?
i) CH3-CH3 and ii) CH2=CH2
i) CH3-CH2-CH3 and ii) CH3-CH3
i) CH3-CH2-CH3 and ii) CH4
i) CH3-CH2-CH2-CH3 and ii) HC\(\equiv\)CH
i) CH3-CH2-CH2-CH3 and ii) CH4
The Correct Option is
Solution and Explanation
Reaction i: Wurtz Reaction
The reaction involves ethyl bromide (CH3-CH2-Br) reacting with sodium (Na) in dry ether. This is the Wurtz reaction, a coupling reaction where two alkyl halides react with sodium to form a new carbon-carbon bond, creating a longer alkane.
The general reaction is: 2 R-X + 2 Na → R-R + 2 NaX. In our case, R is ethyl (CH3-CH2) and X is bromine (Br). Therefore, the product will be CH3-CH2-CH2-CH3, which is butane.
Reaction ii: Decarboxylation
The reaction involves sodium acetate (CH3COONa) reacting with sodium hydroxide (NaOH) in the presence of calcium oxide (CaO) and heat (Δ). This is a decarboxylation reaction, where a carboxylic acid (or its salt) loses carbon dioxide (CO2) to form an alkane.
The general reaction is: R-COONa + NaOH → R-H + Na2CO3. In our case, R is methyl (CH3). Therefore, the product will be CH4, which is methane.
Therefore, the correct answer is (E) i) CH3-CH2-CH2-CH3 and ii) CH4
Top Questions on Haloalkanes and Haloarenes
- Match List-I with List-II:
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(B) Chlorine destabilizes the intermediate carbocation formed during electrophilic sub-stitution.
(C) Chlorine accepts electrons through resonance
(D) Chlorine releases electrons through resonance.
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For the reaction:
\[ 2A + B \rightarrow 2C + D \]
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\[ \begin{array}{|c|c|c|c|} \hline \text{Experiment} & [A]_0 \, (\text{M}) & [B]_0 \, (\text{M}) & \text{Initial rate} \, (\text{M/s}) \\ \hline I & 0.10 & 0.10 & 0.10 \\ II & 0.20 & 0.10 & 0.40 \\ III & 0.20 & 0.20 & 0.40 \\ \hline \end{array} \]
The total order and order in [B] for the reaction are respectively:
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Concepts Used:
Haloalkanes and Haloarenes - Chemical Reactions
Chemical Reactions go with the breaking and bonding of covalent bonds which involve of exchange of electrons. The functional groups of Organic compounds play a consequential role in the process. Based on the above theory, reactions can be classified into five main groups:
Rearrangement Reactions are the type of reactions in which products get formed simply by the rearrangement of atoms and electrons in the reactant molecules.
O
||
NH4CNO → NH2 –C – NH2
Substitution Reactions are the reactions in which an atom or group of atoms is replaced by some other atom or group of atoms without any change in the structure of the remaining part of the molecule.
CH3Br + KOH (aqueous) → CH3OH + KBr
Addition Reactions are the reactions in which products get formed by the addition of some reagent to an unsaturated compound.
CH2 = CH2 + HCl → CH5Cl
- Electrophilic Addition Reactions
- Nucleophilic Addition Reactions
- Free Radical Addition Reactions
Elimination Reactions are the reactions in which the products get formed by the loss of simple molecules like HX from the reactant molecules.
C2H5OH → C2H4
- EN1 (Nucleophilic Elimination Unimolecular)
- EN2 (Nucleophilic Elimination Bimolecular)
A polymerization Reaction is the union of two or more molecules of a substance that form a single molecule with higher molecular weight.
n (CH = CH2) → (-CH2 – CH2 -) n