The compound B formed in the sequence of reaction is
Correct answer: C. Propene
- A. Propylene
- B. Propane
- C. Propene
- D. Propanol
Explanation
To solve such questions, the catalyst tells the whole answer, In the first step alcohol is reacted with PCl3 to form a product A Alcohol in reaction with PCl3 will form alkyl halide along with H3PO3 which is a byproduct The same no of carbons are in alkyl halide as are in alcohol So propyl chloride will be produced We consider only the main product while further solving Now A is reacted with alcoholic KOH We must know alcoholic KOH causes elimination making C=C As CH3-CH2-CH2-Cl +alcohlic KOH --› CH3-CH=CH2 +HCl We consider the main product So B is propene
This question appeared on the ETEA MDCAT 2005 paper, which you can sit online with every answer explained.
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About Alkenes
Alkenes are unsaturated hydrocarbons containing a carbon-carbon double bond with sigma and pi components and restricted rotation. Their reactions include electrophilic addition of hydrogen, halogens, hydrogen halides and water, with Markovnikov orientation, oxidation, combustion and polymerisation, while their preparation commonly involves elimination from alkyl halides or alcohols.
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