JEE Advanced Chemistry question

Statement 1: The IUPAC name of the CH_3-CH=CH-C\equiv CH is pent-3-en-1-yne and not pent-2-ene-4-yne Statement 2: Lowest locant rule for multiple bond is preferred

(A)Assertion is True, Reason is True; Reason is correct explanation for AssertionCorrect
(B)Assertion is True, Reason is True; Reason is not correct explanation for Assertion
(C)Assertion is True, Reason is False
(D)Assertion is False, Reason is True

Answer: (A)

Solution

Numbering CH_3-CH=CH-C\equiv CH from the methyl end gives the double bond locant 2 and the triple bond locant 4 (locant set ); numbering from the terminal alkyne end gives the triple bond locant 1 and the double bond locant 3 (locant set ). Comparing the two locant sets at the first point of

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Question ID VK-159239