Match column I (structure) with column II (principal functional group) column I column IIACH2=CH-BrI-COOH groupBCH2=CH-CHOII-CHO groupCCH3CH(CN)CONH2III-CN groupDCH3CH(COOH)CHOIV-C=C- group V-CONH2 group

priority order of functional groups : -COOH > -CONH 2 > -CN > - CHO > - C=C- > -X

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Match column I (structure) with column II (principal functional group)
column I column II
A CH₂=CH-Br I -COOH group
B CH₂=CH-CHO II -CHO group
C CH₃CH(CN)CONH₂ III -CN group
D CH₃CH(COOH)CHO IV -C=C- group
V -CONH₂ group

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A	B	C	D
IV	II	V	I

A	B	C	D
IV	II	V	II

A	B	C	D
IV	II	III	I

answer is D.

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priority order of functional groups :

-COOH > -CONH₂ > -CN > - CHO > - C=C- > -X

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