JEE Main 2023 — Hydrocarbons Question with Solution
JEE Main 2023 (01 Feb Shift 1)
Question
But--yne is reacted separately with one mole of Hydrogen as shown below:
Identify the incorrect statements from the options given below:
A. A is more soluble than .
B. The boiling point & melting point of are higher and lower than respectively.
C. A is more polar than because dipole moment of is zero.
D. adds easily to than .
Choose an option
Show full solutionCorrect option: B
Step-by-step explanation
A: Cis - But-2-ene
B: Trans - But-2-ene
More polar molecules are more soluble in . Hence A >B.
Molecules having higher dipole moments have higher boiling points due to larger intermolecular forces of attraction. More symmetric isomers have higher melting points due to better packing in crystalline lattice & trans isomers are more symmetric than cis. Hence, in case of boiling point it is A>B and in case of melting point it is B>A.
cis-isomer has resultant of dipoles while in trans isomer dipole moments cancel out.
So, the correct answer is B, C and D only.
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