SELECT * FROM question_mgmt as q WHERE id=3121 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=2 AND subId=9 AND chapterId=53 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

Draw formulas for the first five members of each homologous series beginning with the following compounds.

(a) H-COOH

(b) CH3COCH3

(c) H-CH=CH2

Answer:

The first five members of each homologous series beginning with the given compounds are shown as follows:

(a)

H-COOH : Methanoic acid

CH3-COOH : Ethanoic acid

CH3-CH2-COOH : Propanoic acid

CH3-CH2-CH2-COOH : Butanoic acid

CH3-CH2-CH2-CH2-COOH : Pentanoic acid

 

(b)

CH3COCH3 : Propanone

CH3COCH2CH3 : Butanone

CH3COCH2CH2CH3 : Pentan-2-one

CH3COCH2CH2CH2CH3 : Hexan-2-one

CH3COCH2CH2CH2CH2CH3 : Heptan-2-one

 

(c)

H-CH=CH2 : Ethene

CH3-CH=CH2 : Propene

CH3-CH2-CH=CH2 : 1-Butene

CH3-CH2-CH2-CH=CH2 : 1-Pentene

CH3-CH2-CH2-CH2-CH=CH2 : 1-Hexene


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