In comparison to boron, berylium has :
- lesser nuclear charge and greater first ionisation enthalpy
- lesser nuclear charge and lesser first ionisation enthalpy
- greater nuclear charge and greater first ionisation enthalpy
- greater nuclear charge and lesser first ionisation enthalpy
The Correct Option is A
Solution and Explanation
Top JEE Main Chemistry Questions
- Predict expression for \( \alpha \) in terms of \( K_{eq} \) and concentration
C: \( A_2B_3 \, (aq) \rightleftharpoons 2A^{3+} (aq) + 3B^{2-} (aq) \)
- JEE Main - 2026
- Chemistry
- Law Of Chemical Equilibrium And Equilibrium Constant
Consider the following reaction sequence.
- JEE Main - 2026
- Chemistry
- Hydrocarbons
- Which of the following is most basic?
- JEE Main - 2026
- Chemistry
- Organic Chemistry
Consider the reaction given below:
\(\text{A gives positive Fehling's test. Choose the correct relation}\).
- JEE Main - 2026
- Chemistry
- Organic Chemistry
Write the correct order of rate of reaction of following compounds with $PhN_2Cl$
P: $N,N$-dimethylaniline
Q: $N,N$-dimethyl-3-methylaniline
R: $N,N$-dimethyl-2,6-dimethylaniline
- JEE Main - 2026
- Chemistry
- Organic Chemistry
Top JEE Main Classification Questions
In general, the properties that decrease and increase down a group in the periodic table respectively are:
- JEE Main - 2019
- Chemistry
- Classification
- When the first electron gain enthalpy $( \Delta_{eg}H) $ of oxygen is $-141\, kJ/mol$, its second electron gain enthalpy is :
- JEE Main - 2019
- Chemistry
- Classification
- For $Na^{+}, Mg^{2+}, F^{-}$ and $O^{2-}$; the correct order of increasing ionic radii is :
- JEE Main - 2018
- Chemistry
- Classification
- The electronic configuration with the highest ionization enthalpy is :
- JEE Main - 2017
- Chemistry
- Classification
- The following statements concern elements in the periodic table. Which of the following is true ?
- JEE Main - 2016
- Chemistry
- Classification
Top JEE Main Questions
- What is the equivalent gate for the following digital circuit?
- JEE Main - 2026
- Analog and Digital Electronics
- In an equilateral prism the path of a ray is shown in the figure. Determine the refractive index of the prism.
- JEE Main - 2026
- Ray optics and optical instruments
- Predict expression for \( \alpha \) in terms of \( K_{eq} \) and concentration
C: \( A_2B_3 \, (aq) \rightleftharpoons 2A^{3+} (aq) + 3B^{2-} (aq) \)
- JEE Main - 2026
- Law Of Chemical Equilibrium And Equilibrium Constant
Consider the following reaction sequence.
- JEE Main - 2026
- Hydrocarbons
- For the matrices \( A = \begin{bmatrix} 3 & -4 \\ 1 & -1 \end{bmatrix} \) and \( B = \begin{bmatrix} -29 & 49 \\ -13 & 18 \end{bmatrix} \), if \( (A^{15} + B) \begin{bmatrix} x \\ y \end{bmatrix} = \begin{bmatrix} 0\\ 0 \end{bmatrix} \), then among the following which one is true?}
- JEE Main - 2026
- Matrices
Concepts Used:
Haloalkanes and Haloarenes - Classification
Classification of Haloalkanes and Haloarenes are as follows:
Haloalkanes and Haloarenes are Classified on the Basis of the Number of Halogen Atoms:
These are further classified as mono, di, or polyhalogen (tri-,tetra-, etc.) compounds depending on whether they contain one, two or more halogen atoms in their structures. For example;
- Monohaloalkane
- Dihaloalkane
- Trihaloalkane
Haloalkanes and Haloarenes are Classified on Compounds Containing sp3 C—X Bond (X= F, Cl, Br, I)
This class includes:
- Alkyl halides or haloalkanes (R—X)
- Allylic halides
- Benzylic halides
Haloalkanes and Haloarenes are Classified on Compounds Containing sp2 C—X Bond
This class includes:
- Vinylic halides
- Aryl halides