In which of the following; molecules are not only associated by dispersion forces but some other additional intraction are also involve between the molecules :-
(I) Dichloro ethlyen $(ℓ) (μ = 1.89$ Debye) $(ℓ =$ liquid $)$
(II) 1-butyne ( $ℓ$ )
(III) 2 - butyne ( $ℓ$ )
(IV) Solution of $I_{2}$ in $CHCl_{3}$

Question

In which of the following; molecules are not only associated by dispersion forces but some other additional intraction are also involve between the molecules :-

(I) Dichloro ethlyen $(ℓ) (μ = 1.89$ Debye) $(ℓ =$ liquid $)$

(II) 1-butyne ( $ℓ$ )

(III) 2 - butyne ( $ℓ$ )

(IV) Solution of $I_{2}$ in $CHCl_{3}$

TestHub · Accepted Answer

Dichloroethylene ( l ): With a dipole moment μ = 1.89 D , it is polar and exhibits dipole-dipole interactions. 1-butyne ( l ): This terminal alkyne is slightly polar due to the sp hybridized carbon, leading to weak dipole-dipole forces. 2-butyne ( l ): This molecule is symmetrical and non-polar, so it only has dispersion forces. Solution of I₂ in CHCl₃: While I₂ is non-polar, CHCl₃ is polar. The interaction between them includes dipole-induced dipole forces. Since (I), (II), and (IV) involve interactions other than just dispersion forces, the correct option is (A).

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