Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to a gaseous hydrocarbon containing less than four carbon atoms. (A) is

• CH ≡ CH

• H₂C = CH₂

• CH₄

• CH₃-CH₃

Which of the following carbocations is expected to be most stable?

In the reaction,

The electrophile involved is

• Dichloromethyl cation (C⁺HCl₂)

• Formyl cation (C⁺HO)

• Dichlorocarbene (:CCl₂)

• Dichloromethyl anion (C^-HCl₂)

Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their

• Formation of intramolecular H-bonding

• Formation of intermolecular H-bonding

• Formation of intermolecular H-bonding

• More extensive association of carboxylic acid via Vander Waals force of attraction

45.

Compound A, C₈H₁₀O, is found to react with NaOI (produced by reacting Y with NaOH) and yields a yellow precipitate with characteristic smell. A and Y are respectively

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