Considering the state of hybridisation of carbon atoms, find out the molecule among the following which is…

Considering the state of hybridisation of carbon atoms, find out the molecule among the following which is linear.
  1. $\mathrm{CH}_3-\mathrm{C} \equiv \mathrm{C}-\mathrm{CH}_3$
  2. $\mathrm{CH}_2=\mathrm{CH}-\mathrm{CH}_2-\mathrm{C} \equiv \mathrm{CH}$
  3. $\mathrm{CH}_3-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{CH}_3$
  4. $\mathrm{CH}_3-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}_3$

Solution

$\mathrm{H}_3 \mathrm{C}-\mathrm{C} \equiv \mathrm{C}-\mathrm{CH}_3$ is linear, because $\mathrm{C}_2$ and $\mathrm{C}_3$ are $s p$ hybridised.

Asked in: NEET 2011 (Screening)

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