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Chain Isomerism

Number of cha...

Question

Number of chain isomer of $C_{5} H_{12}$ is :

A

2

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B

5

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C

3

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D

8

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Solution

The correct option is C
3

First let's draw straight chain structure of $C_{5} H_{12}$ :

$\begin{matrix} \Rightarrow C H_{3} - C H_{2} - C H_{2} - C H_{3} (n - P e n t a n e) C H_{3} - C H_{2} - C H - C H_{3} (2 - M e t h y l b u t a n e) | C H_{3} C H_{3} | C H_{3} - C - C H_{3} | C H_{3} (2, 2 - D i m e t h y l p r o p a n e) \end{matrix} ⎫ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎬ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎭ O n l y t h e s e a r e p o s s i b l e S t r u c t u r e$
But, note that

$C H_{3} - C H_{3} | C H - C H_{2} - C H_{3} a n d C H_{3} - C H_{2} - C H_{3} | C H - C H_{3} a r e s a m e . B o t h a r e (2 - M e t h y l b u t a n e)$

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