A gas decolorized alkaline KMnO4 solution but does not give any PPT with ammoniacal AgNO3
Correct answer: B. Ethylene
- A. Methane
- B. Ethylene
- C. Ethane
- D. None of the above
Explanation
Option d) "None of the above" is incorrect because ethylene (option b) decolorizes KMnO4 but does not give a precipitate with ammoniacal AgNO3. Methane (option a) and ethane (option c) are both saturated hydrocarbons with only single bonds and are not reducing agents, so they would not decolorize KMnO4 or react with ammoniacal AgNO3 to form a precipitate. Therefore, the correct answer is option b) Ethylene.
This question appeared on the ETEA MDCAT 2019 paper, which you can sit online with every answer explained.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
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.
Practise Chemistry of Hydrocarbons
1,091 free Chemistry of Hydrocarbons MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Alkenes questions
Propene reacts with hypochlorous acid to form
Alkene+O3→Ozonide "Zn+H2O"→Propanone+Propanal, The IUPAC name of alkene is:
In the CH3CH2C = CH + H2O ->?
An olefin "X" on ozonolysis gives CH3CH2COCH3 and CH3COCH3. The IUPAC name of X is:
The order of decreasing reactivities of alkanes, alkenes and alkynes is:
The addition of hypo-chicrous acid to 1 butene gives: