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Solution


Q.

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 and 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) Br2 adds easily to B than A.

Identify the incorrect statements from the options given below:             [2023]
1 B and C only  
2 B, C and D only  
3 A, C and D only  
4 C and D only  

Ans.

(4)

Physical properties Remarks
Dipole moment A > B

cis-isomer has resultant of dipoles while in trans-isomer dipole moments cancel out.
Boiling point A > B Molecules having higher dipole moment have higher boiling point due to larger intermolecular force of attraction.
Solubility (in H2O) A > B More polar molecules are more soluble in H2O.
Melting point B > A More symmetric isomers have higher melting points due to better packing in crystalline lattice & trans-isomers are more symmetric than cis.