The compound which forms acetaldehyde when heated with dilute NaOH is
1 chloro ethane
1, 1 dichloro ethane
1, 2 dichloro ethane
1, 1, 1 trichloro ethane
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The correct order of decreasing acid strength of trichloroacetic acid (A), trifluoroacetic acid (B), acetic acid (C) and formic acid (D) is