Which of the following pairs of homologous series is represented by the general molecular formula $C_{n} H_{2 n - 2}$ ?

Alkene and alkyne

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Alkyne and alkadiyne

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Alkane and alkadiene

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Alkyne and alkadiene

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Solution

The correct option is D Alkyne and alkadiene
Alkynes and alkadienes have the general formula $C_{n} H_{2 n - 2}$ .

For example: Molecular formula $C_{5} H_{8}$

$C H \equiv C - C H_{2} - C H_{2} - C H_{3}$ $1 - P e n t y n e$

$C H_{2} = C H - C H_{2} - C H = C H_{2}$ $1, 4 - p e n t a d i e n e$

Option D is correct.

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Similar questions

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

(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 $C_{n} H_{2 n + 2}$

The molecules of alkene family are represented by a general formula $C_{n} H_{2 n}$ . Answer the following:
(a) What do n and 2n signify?
(b) What is the name of alkene when n = 4?
(c) What is the molecular formula of alkene when n = 4?
(d) What is the molecular formula of the alkene if there are ten H atoms in it?
(e) What is the structural formula of the third member of the alkene family?
(f) Write the molecular formula of lower and higher homologous of an alkene which contains four carbon atoms.

Write the name and formula of the 2nd member of homologous series having general formula C_nH_2n.

(a) Define a homologous series. Give the name and structural formula of one homologue of the following :
$C H_{3} O H$
(b) Write the molecular formula of the third member of the homologous series of carbon compounds with general formula $C_{n} H_{2 n + 1} O H .$
(c) Name any two fossil fuels.

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Which of the following pairs of homologous series is represented by the general molecular formula CnH2n−2 ?

The correct option is D Alkyne and alkadieneAlkynes and alkadienes have the general formula CnH2n−2.For example: Molecular formula C5H8CH≡C−CH2−CH2−CH3 1−PentyneCH2=CH−CH2−CH=CH2 1,4−pentadieneOption D is correct.

Which of the following pairs of homologous series is represented by the general molecular formula $C_{n} H_{2 n - 2}$ ?