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Statement-I: Bond length 'a' is shorter than bond length 'b'. Statement-II: The greater the double-bond character of a bond, the shorter is its length. Choose the correct option.

1. Statement-1 is true, Statement-2 is true, and Statement-2 is the correct explanation of Statement-1.
2. Statement-1 is true, Statement-2 is true, but Statement-2 is NOT the correct explanation of Statement-1.
3. Statement-1 is true, Statement-2 is false.
4. Statement-1 is false, Statement-2 is true.

Correct answer: Statement-1 is true, Statement-2 is true, and Statement-2 is the correct explanation of Statement-1.

Solution

More double-bond character means higher bond order, and higher bond order shortens the bond. Statement-II is a true general rule. Statement-I (a < b) holds because bond 'a' carries more double-bond character than 'b', so Statement-II is exactly the reason for Statement-I. Hence both are true and II correctly explains I.

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