निम्नलिखित में से कौन-सी समजातीय श्रेणी नहीं है?

1
C3H7OH, C4H9OH, C5H11OH, C6H11OH
2
CH4, C2H6, C3H8, C4H10
3
C2H2, C2H4, C3H6, C4H8
4
C2H4, C2H6, C3H6, C4H8

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