What is the molecular formula of the third member of the homologous series of carboxylic acid and alkyne.

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Solution

$T h i r d m e m b e r o f t h e a c i d i s C_{3} c a r b o n a n d t h e g e n e r a l f o r m u l a o f c a r b o x y l i c a c i d i s C_{n} H_{2 n} O_{2} S o t h e a c i d h a s t h e f o r m u l a - C_{3} H_{6} O_{2} T h e s t r u c t u r e i s C H_{3} C H_{2} C O O H - P r o p a n o i c a c i d T h i r d m e m b e r o f t h e a l k y n e i s C_{3} c a r b o n a n d t h e g e n e r a l f o r m u l a o f a l k y n e i s C_{n} H_{2 n - 2} S o t h e a l k y n e h a s t h e f o r m u l a - C_{3} H_{4} T h e s t r u c t u r e i s C H_{3} - C \equiv C H a n d t h e n a m e i s P r o p y n e$

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The molecular formula of the third member of the homologous series of ketones is :
(a) $C_{4} H_{8} O$ (b) $C_{3} H_{6} O$ (c) $C_{5} H_{10} O$ (d) $C_{6} H_{12} O$

Q. Write the molecular formulae of the third and fifth members of homologous series represented by the general formula C_nH_2n₋₂.

Q. The first member of alkyne homologous series is:

(a) Give the general name of the class of compounds having the general formula $C_{n} H_{2 n - 2} .$ Write the name of the first member of this homologous series.
(b) The general formula of a homologous series of carbon compounds is $C_{n} H_{2 n} .$ Write the molecular formulae of the second and fourth members of the series.
(c) Write the molecular formulae of the third and fifth members of homologous series of carbon compounds represented by the general formula $C_{n} H_{2 n + 2}$

Q. What is the homologous series of alcohols, aldehyde, ketones, and carboxylic acid ?

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