Question

how many stuctural isomers are possible for pentane? draw the structural formula of all the possible isomers of pentane.​

Answer 1

Answer:

Three structural isomers

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Answer 2

Topic: Carbon and its compounds

sub-topic: Isomers

Âηswεr:

the molecular formula of pentane is C₅H₁₂. it has 5 carbon atoms. We have to arrange these 5 carbon atoms in different possible ways to obtain all the isomers of pentane.

(i) First we write all the 5 carbon atoms in one straight chain [see attachment (1)]. this will give us an isomer called n- pentane. (normal-pentane).

(ii) Next we write 4 carbon atoms in the straight chain and 1 carbon atom in the side chain. [see attachment (2)]. This will give us a second isomer called isopentane.

(iii) And finally we put 3 carbon atoms in the straight chain and the remaining 2 carbon atoms in two side chains. [see attachment (3)]. this gives us a third isomer of pentane called neopentane.

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We cannot have anymore arrangements of 5 carbon atoms of pentane. So, Only 3 structural isomers are possible for pentane.