JEE Main 2022 · ChemistryMultiple choiceSingle correctMediumMulti-step

JEE Main 25 July 2022, Shift 1, Chemistry Q70

Question 70 of 90 in this shift, Chemistry question 10 of 30, Section A.

The geometry around boron in the product 'B' formed from the following reaction is

\mathrm{BF_3+NaH\xrightarrow{450\ K}A+NaF}

\mathrm{A+NMe_3\rightarrow B}

(1)trigonal planar
(2)tetrahedralOfficial answer
(3)pyramidal
(4)square planar

Official answer

Option 2

NTA final key (2022 Session 2).

Chapter: The p-Block Elements
Topic: Group 13 & 14
Idea tested: Symmetrical vs. Asymmetrical Cleavage of Diborane

Same topic in other shifts

All Group 13 & 14 questions

2 Apr 2026, Shift 2 · Q70Among Fe $^{2+}$ , Fe $^{3+}$ , Cr $^{2+}$ and Zn $^{2+}$ , the ion that shows positive borax bead test and with highest ionisation enthalpy is:MediumSingle correct
4 Apr 2026, Shift 2 · Q58The electronegativity of a group 13 element 'E' is same as that of Ge (on Pauling scale and upto one decimal point). The CORRECT…HardOther
6 Apr 2026, Shift 1 · Q59Given below are two statements: Statement I: Aluminium is more electropositive than thallium as the standard electrode potential value of…MediumTwo statements
3 Apr 2025, Shift 2 · Q60The correct orders among the following are A. Atomic radius : B < Al < Ga < In < Tl B. Electronegativity : Al < Ga < In < Tl < B C.…MediumOther
4 Apr 2025, Shift 2 · Q57The elements of Group 13 with highest and lowest first ionisation enthalpies are respectively :EasySingle correct
4 Apr 2025, Shift 2 · Q58Given below are two statements : Statement (I) : The first ionisation enthalpy of group 14 elements is higher than the corresponding…MediumTwo statements

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.