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  4. Which of the following is not a isomer of pentane ?

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Q. Which of the following is not a isomer of pentane ?

MHT CETMHT CET 2012

Solution:

(a)$n$ -pentane

$CH _{3}- CH _{2}- CH _{2}- CH _{2}- CH _{3} \,\,\,\left( C _{5} H _{12}\right)$

(b) $2,2 $ -dimethyl-1-propane

$CH_3 - \underset{\overset{|}{C}H_3}{\overset{\underset{|}{C}H_3}{C}} - CH_3 \,\,\,\,\left( C _{5} H _{12}\right)$

(c) $2,3 $ -dimethyl-1-butane

$CH_3 - \overset{\overset{CH_3}{|}}{CH} - \overset{\overset{CH_3}{|}}{CH} - CH_3 \,\,\,\,\, (C_6H_{14})$

(d) $2$ -methyl- $1$ -butane

$CH_3 - CH_2 - \overset{\overset{CH_3}{|}}{CH} - CH_3 \,\,\,\,\,\,\, (C_6 H_14)$