Match the following columns. Column I Column II (i) Ethanoic acid (a) H 3 C - CH 2 - CH 2 - CH 2 - CH 2 - Br (ii) Bromopentane (b) CH 3 COOH (iii) Butanone (c) H 3 C - CH 2 - CH 2 - CH 2 - CH 2 - CHO (iv) Hexanal (d) H 3 C - CH 2 - C = O - CH 3

(i) The IUPAC name of ethanoic acid indicates that the parent chain consists of two carbon atoms and hence the root word is 'eth'. The valencies of carbon atoms are satisfied by single bonds as the root word ends with 'ane'. A carboxylic acid functional group, - COOH is present in this compound, so the suffix used is 'oic acid'. Therefore, the condensed structure of ethanoic acid is CH 3 COOH . (ii) The IUPAC name bromopentane indicates that the parent chain consists of five carbon atoms and hence the root word is 'pent'. All the valencies of carbon atoms are satisfied by single bonds as the root word ends with 'ane'. Hetero atom bromine is present at the carbon as a substituent for hydrogen, so the prefix used is 'bromo'. Therefore, the condensed structure of bromopentane is H 3 C - CH 2 - CH 2 - CH 2 - CH 2 - Br . (iii) The IUPAC name butanone or butan-2-one indicates that the parent chain consists of four carbon atoms and hence the root word is 'but'. All the valencies of carbon atoms are satisfied by single bonds as the root word ends with 'ane'. Ketone functional group is present at second carbon, so the suffix used is 'one' and the number 2 represents the position of the keto group. Therefore, the condensed structure of butanone is H 3 C - CH 2 - C = O - CH 3 . (iv) The IUPAC name hexanal indicates that the parent chain consists of six carbon atoms and hence the root word is 'hex'. All the valencies of carbon atoms are satisfied by single bonds as the root word ends with 'ane'. Aldehyde functional group, - CHO is present at the carbon atom, so the suffix used is 'al'. Therefore, the condensed structure of hexanal is H 3 C - CH 2 - CH 2 - CH 2 - CH 2 - CHO . Column I Column II (i) Ethanoic acid (b) CH 3 COOH (ii) Bromopentane (a) H 3 C - CH 2 - CH 2 - CH 2 - CH 2 - Br (iii) Butanone (d) H 3 C - CH 2 - C = O - CH 3 (iv) Hexanal (c ) H 3 C - CH 2 - CH 2 - CH 2 - CH 2 - CHO

E M B I B E

All in One - ICSE Chemistry>Chapter 9 - General Organic Chemistry>CHAPTER EXERCISE>Q 6

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The correct structural formula of butanoic acid is

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Important Questions on General Organic Chemistry

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All in One - ICSE Chemistry>Chapter 9 - General Organic Chemistry>CHAPTER EXERCISE>Q 7

Which of the following is the correct IUPAC name?

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All in One - ICSE Chemistry>Chapter 9 - General Organic Chemistry>CHAPTER EXERCISE>Q 8

The pair of compounds representing isomers is

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All in One - ICSE Chemistry>Chapter 9 - General Organic Chemistry>CHAPTER EXERCISE>Q 9

Match the following columns.

Column I	Column II
(i) Ethanoic acid	(a) $H_{3} C - {CH}_{2} - {CH}_{2} - {CH}_{2} - {CH}_{2} - Br$
(ii) Bromopentane	(b) ${CH}_{3} COOH$
(iii) Butanone	(c) $H_{3} C - {CH}_{2} - {CH}_{2} - {CH}_{2} - {CH}_{2} - CHO$
(iv) Hexanal	(d) $H_{3} C - {CH}_{2} - (C = O) - {CH}_{3}$