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Question

The decreasing order of priority for the following functional groups is:
I. ROH II. RCCR
III. ROR IV. RNH2

A
(IV) > (I) > (II) > (III)
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B
(IV) > (I) > (III) > (II)
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C
(I) > (IV) > (III) > (II)
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D
(II) > (III) > (IV) > (I)
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Solution

The correct option is C (I) > (IV) > (III) > (II)
Formula Function Sufix
(main function)
Prefix
(secondary function)
Example
RO||COH Acid-oic acid carboxyl- CH3COOH
Ethanoic acid
RO||COR Ester -yl -oate CH3COOCH3
Methyl ethanoate
RO||CNH2 Amide -amide carboxamido CH3CH2CONH2
Propanamide
RCNNitrile -nitrile
(cyanide)
cyano-CH3CN
Ethanenitrile
Methyl cyanide
RO||CH Aldehyde -aloxo- CH3CH2CHO
Propanal
RO||CR Ketone -one oxo-CH3COCH3
Propanone
ROH Alcohol-ol hydroxi- CH3CH2OH
Ethanol
RNH2Amine -amineamion- CH3CH2NH2
Ethylamine
ROREther -yl...yleter oxa- CH3OCH2CH3
Ethylmethyleter
>C=C<Alkyne -ene CH3CH=CH2
Propyne
CC Alkyne -yne CH3CH=CH2
Propene
RNO2Nitro nitro- CH3CH2NO2
Nitroethane
RXHalide fluoro-, chloro-, bromo-, iodo- CH3CH2Br
Bromoethane
RRadical yl- CH3CH3|CHCH3
Methylpropane
The decreasing order of priority of functional group is :
1. ROH
2. RNH2
3. ROR
4. RCCR

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