JEE Main 2023 — Hydrocarbons Question with Solution
From: JEE Main 2023 (Online) 1st February Morning Shift
Question
But-2-yne is reacted separately with one mole of Hydrogen as shown below :
A. A is more soluble than B.
B. The boiling point & melting point of A are higher and lower than B respectively.
C. A is more polar than B because dipole moment of A is zero.
D. adds easily to B than A.
Identify the incorrect statements from the options given below :
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Choose an option
Show full solutionCorrect option: D
Step-by-step explanation
cis-2-butene is more polar that is why it's solubility is more than trans-2-butene.
A is correct.
cis-2-butene has a lower melting point than trans-2-butene as trans-form has compact packing crystal lattice. cis-2-butene is polar so, it has higher boiling point than trans-form.
B is also correct.
cis-2-butene is more polar but dipole moment of cis-2-butene(A) is not zero.
C is incorrect.
'Cis' structure is less stable than 'Trans" structure. Less stable means more reactive. So Cis - But-2-ene(A) will react more easily with Br2.
D is also incorrect.
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This is a previous-year question from JEE Main 2023, covering the Hydrocarbons chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.