Which among the following are unsaturated hyd | vedclass

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(C) Unsaturated hydrocarbons are those that contain at least one carbon-carbon double bond $(C=C)$ or triple bond $(C\equiv C)$.$(i)$ $H_3C-CH_2-CH_2-

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$(ii)$ and $(iv)$

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(C) Unsaturated hydrocarbons are those that contain at least one carbon-carbon double bond $(C=C)$ or triple bond $(C\equiv C)$.$(i)$ $H_3C-CH_2-CH_2-CH_3$ is Butane,which is a saturated hydrocarbon (alkane).$(ii)$ $H_3C-C\equiv C-CH_3$ is But$-2-$yne,which contains a triple bond,so it is unsaturated.$(iii)$ $H_3C-CH(CH_3)-CH_3$ is Isobutane ($2$-methylpropane),which is a saturated hydrocarbon (alkane).$(iv)$ $H_3C-C(CH_3)=CH_2$ is $2-$methylpropene,which contains a double bond,so it is unsaturated.Therefore,$(ii)$ and $(iv)$ are unsaturated hydrocarbons.

Which among the following are unsaturated hydrocarbons?
$(i)$ $H_3C-CH_2-CH_2-CH_3$
$(ii)$ $H_3C-C\equiv C-CH_3$
$(iii)$ $H_3C-CH(CH_3)-CH_3$
$(iv)$ $H_3C-C(CH_3)=CH_2$

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Which among the following are unsaturated hydrocarbons?$(i)$ $H_3C-CH_2-CH_2-CH_3$$(ii)$ $H_3C-C\equiv C-CH_3$$(iii)$ $H_3C-CH(CH_3)-CH_3$$(iv)$ $H_3C-C(CH_3)=CH_2$