JEE Main 2021Chemistryp Block Elements (Group 13 & 14)MediumMCQ

JEE Main 2021 — p Block Elements (Group 13 & 14) Question with Solution

JEE Main 2021 (27 Aug Shift 1)

Question

In which one of the following molecules strongest back donation of an electron pair from halide to boron is expected?

Choose an option

Show full solutionCorrect option: D
Correct answer
DBF3

Step-by-step explanation

Due to small size atom show strongest back bonding in BF3.
In case of BF3 (2P-2P back bonding) while in BCl3(2P-3P),BBr3(2P-4P) and BI3(2P-5P) back bonding. So extent of back bonding is maximum in 2P-2P

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About this question

This is a previous-year question from JEE Main 2021, covering the p Block Elements (Group 13 & 14) chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.