Civil Services WBCS (Executive) Prelims + Mains Mock Tests 2025 General Science Chemistry

निम्नलिखित में से कौन-सा युग्म एक ही समजातीय श्रेणी में होगा?

1
CH3CHO और CH3OH
2
CH3OH और HCOOH
3
C2H5OH और CH3COOH
4
CH3COCH3 और C2H5COCH3
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