Which of the following exists as dimer ?
a) AlCl3
b) CaCl2
c) NCl3
d) BF3
Answers
Answer:
a) ALCL3 aluminium chloride
Explanation:
Dimers are linked by hydrogen bonds, coordinate bonds, or covalent bonds. Sucrose is a dimer composed of the monomers glucose and fructose.
Answer:
Of the compounds given, AlCl₃ exists as a dimer.
Explanation:
The word dimer is made of two parts, di- meaning 'two' and mer-meaning 'parts'. It is a molecule that has two monomers joined together by strong or weak bonds. The term homodimer is used when the two molecules are identical( A-A) and the term heterodimer is used when they are not (A-B).
In AlCl₃, the valence shell of Al has only 6 electrons. To complete their octet and gain stability, they require 2 more electrons. These 2 electrons are acquired by taking the electron pair from the chlorine atom, thereby forming a dimer Al₂Cl₆ which is more stable and undergoes milder reactions.