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In the following questions, a statement ...

In the following questions, a statement of assertion (A) is followed by a statement of reason (R )
A : `BeCl_(2)` in vapour phase is electron deficient molecule.
R : Any molecule in which central atom is having incomplete octet is known as electron deficient molecule.

A

If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)

B

If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)

C

If Assertion is true statement but Reason is false, then mark (3)

D

If both Assertion and Reason are false statements , then mark (4).

Text Solution

AI Generated Solution

The correct Answer is:
To analyze the given statements about BeCl₂ and determine the validity of the assertion (A) and the reason (R), we can follow these steps: ### Step 1: Understand the Assertion The assertion states that BeCl₂ in the vapor phase is an electron-deficient molecule. **Explanation**: - Beryllium (Be) is a group 2 element with 2 valence electrons. - In BeCl₂, beryllium forms two bonds with two chlorine atoms, using its 2 valence electrons. - Each chlorine atom contributes 1 electron to form a covalent bond, resulting in a total of 4 electrons around beryllium (2 from beryllium and 2 from chlorine). - However, beryllium only has 4 electrons, which is less than the 8 electrons needed for a complete octet. ### Step 2: Understand the Reason The reason states that any molecule in which the central atom has an incomplete octet is known as an electron-deficient molecule. **Explanation**: - An electron-deficient molecule is defined as one where the central atom does not have a complete octet (i.e., fewer than 8 electrons). - Since beryllium in BeCl₂ has only 4 electrons, it indeed has an incomplete octet. ### Step 3: Evaluate Both Statements - Both the assertion (A) and the reason (R) are true. - The reason correctly explains why BeCl₂ is considered an electron-deficient molecule. ### Conclusion Since both statements are true and the reason correctly explains the assertion, we conclude that the assertion is valid. ### Final Answer Both the assertion (A) and the reason (R) are true, and the reason is the correct explanation of the assertion. ---
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