Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
Assertion: \[C-H\] bond in ethyne is shorter than \[C-H\] bonds in ethene. Reason: Carbon atom in ethene is sp hybridised while it is \[s{{p}^{2}}\] in ethyne.A) If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
B) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
C) If Assertion is true but Reason is false.
D) If both Assertion and Reason are false.
Correct Answer: C
Solution :
The correct reason is the carbon atom is \[s{{p}^{2}}\] hybridized in ethene and sp hybridised in ethyne. \[H-\overset{s{{p}^{2}}}{\mathop{\underset{H}{\mathop{\underset{|}{\mathop{C}}\,}}\,}}\,=\overset{s{{p}^{2}}}{\mathop{\underset{H}{\mathop{\underset{|}{\mathop{C}}\,}}\,}}\,-H\] \[H-\overset{sp}{\mathop{C}}\,\equiv \overset{sp}{\mathop{C}}\,-H\]
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