NEETChemistryChemical Bonding and Molecular Structure
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The molecule of tetracyanoethene, C ₂( CN )₄ , contains exactly 9 bonds and 9 bonds. Reason (R): A carbon-nitrogen triple bond ( - C N ) consists of two bonds and one bond. In the light of the above statements, choose the most appropriate answer from the options given below:
Options
- ABoth Assertion (A) and Reason (R) are correct and Reason (R) is the correct explanation of Assertion (A)
- BBoth Assertion (A) and Reason (R) are correct but Reason (R) is not the correct explanation of Assertion (A)
- CAssertion (A) is correct but Reason (R) is incorrect
- DAssertion (A) is incorrect but Reason (R) is correct
Correct answer
C. Assertion (A) is correct but Reason (R) is incorrect
Step-by-step solution
Tetracyanoethene has the structure ( NC )₂ C = C ( CN )₂ . The molecule contains: - One central C = C double bond, which contributes 1 and 1 bond. - Four C - C single bonds connecting the cyano groups to the central carbons, contributing 4 bonds. - Four C N triple bonds, each contributing 1 and 2 bonds, for a total of 4 and 8 bonds. Total bonds = 1 + 4 + 4 = 9 . Total bonds = 1 + 8 = 9 . Thus, Assertion (A) is correct. A triple bond consists of one bond and two bonds, not two bonds and one bond. Thus, Reason (R) is