Question

Assertion: Alkenes are called olefins.
Reason: they form oily liquids on reaction with chlorine gas.
A. both assertion and reason are correct and reason is the correct explanation for assertion.
B. both assertion and reason are correct, but the reason is not the correct explanation.
C. assertion is correct but reason is not true
D. both assertion and reason are incorrect

Answer 1

Hint : Alkenes and alkynes have properties similar to those of corresponding alkanes. Alkenes and alkynes up to four carbons are gases at room temperature. Being relatively nonpolar themselves, alkenes and alkynes dissolve non polar solvents or in solvents of low polarity.

Complete Step By Step Answer:
Alkenes are hydrocarbons whose molecules contain carbon- carbon double bond.an old name for this family of compounds that is still often used is the name olefins. Ethene, the simplest olefin(alkene) was called olefiant gas in latin oleum, oil to make. Because gaseous ethene reacts with chlorine to form $ {C_2}{H_4}C{l_2} $ a liquid oil. Hydrocarbon whole molecules containing the carbon-carbon triple bond are called alkynes. The common name for this family is acetylenes.
Alkenes and alkynes have properties similar to those of corresponding alkanes. Alkenes and alkynes up to four carbons are gases at room temperature. Being relatively nonpolar themselves, alkenes and alkynes dissolve non polar solvents or in solvents of low polarity.

Note :
Most of the organic compounds are alkanes and aromatic compounds. It also contains a small amount of oxygen, nitrogen, and sulphur containing compounds in petroleum. Some of the molecules in petroleum are clearly of biological origin. Most scientists believe that petroleum originates with accumulation of dead microorganisms.