Select the correct statement.

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Observed B-Cl distance is shorter than what is expected theoretically in BCl₃ molecule

First ionization energy of Al is more than that of Ga.

Al is obtained by reduction of ${Al}_{2} O_{3}$ with coke

${AlCl}_{3}$ forms a dimer because Al has high ionization energy.

answer is A.

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Detailed Solution

(1) In BCl₃ , The pπ−pπ back bonding of the fully filled p-orbital of halogen (X) into empty p-orbital of boron causes resonance which results in shorter B-Cl distance.

(2) Ionization energy of Ga is more than Al, due to small size of Ga.

(3) Aluminium has far greater affinity for oxygen as compared to carbon because of which carbon cannot separate oxygen from aluminium oxide. Hence Al metal cannot be obtained by the reduction of Al₂O₃ with coke.

(4) AlCl₃ can form dimer and exists as Al₂Cl₆, due to the presence of vacant d-orbitals.

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