Assertion : The name of the hydrocarbon ...

Assertion : The name of the hydrocarbon `(CH_(3))_(2)CHCH_(2)CH_(2)CH(CH_(3))CH_(2)CH_(3)` is 2,5-dimethyl heptane and not 3, 6-dimethyl heptane.
Reason : Numbering should be done in such a way that sum of the locants on the parent chain is lowest possible number.

If both (A) and (R ) are correct and (R ) is the correct explanation of (A)

If both (A) and (R ) are correct, but (R ) is not the correct explanation of (A)

If (A) is correct, but (R ) is incorrect

If both (A) and (R ) are incorrect

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