In the CH3CH2C = CH + H2O ->?
Correct answer: D. CH3CH2COCH3
- A. CH3CHO + CH3CHO
- B. CH3CH2CH2CH2 - OH
- C. CH3CH2CH2COOH
- D. CH3CH2COCH3
Explanation
The correct answer is D:CH3CH2COCH3. When water is added to an alkyne, it typically undergoes a hydration reaction resulting in the formation of aldehydes or ketones. In this case, the terminal alkyne undergoes hydration to form a ketone. Options A, B, and C suggest products that are not typically formed under these reaction conditions. Option A suggests aldehyde formation from a non-terminal alkyne, which is incorrect. Option B suggests alcohol formation, and option C suggests carboxylic acid formation, both of which are incorrect for this reaction.
This question appeared on the ETEA MDCAT 2016 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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