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(N/A) The general formula of an alkyl group is $C_{n}H_{2n+1}$,which is denoted by $R$.An alkyl group has one hydrogen atom less than the correspondin

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(N/A) The general formula of an alkyl group is $C_{n}H_{2n+1}$,which is denoted by $R$.
An alkyl group has one hydrogen atom less than the corresponding alkane group. Examples are shown in the table below:

Formula	Structure	Name
$CH_{3}-$	$-CH_{3}$	Methyl group
$C_{2}H_{5}-$	$CH_{3}-CH_{2}-$	Ethyl group
$C_{3}H_{7}-$	$CH_{3}-CH_{2}-CH_{2}-$	$n$-Propyl group
$C_{3}H_{7}-$	$CH_{3}-CH(CH_{3})-$	Isopropyl group
$C_{4}H_{9}-$	$CH_{3}-CH_{2}-CH_{2}-CH_{2}-$	$n$-Butyl group
$C_{4}H_{9}-$	$CH_{3}-CH_{2}-CH(CH_{3})-$	$sec$-Butyl group
$C_{4}H_{9}-$	$(CH_{3})_{2}CH-CH_{2}-$	Isobutyl group
$C_{4}H_{9}-$	$(CH_{3})_{3}C-$	$tert$-Butyl group

Column-$I$ (Structure)	Column-$II$ ($\text{IUPAC}$ Name)
$A$. $3-$Bromocyclohexanol	$1$. $2, 5$-Dimethylhexane-$1, 3$-diol
$B$. $CH_3-C(Br)=C(CH_3)-CH_2OH$	$2$. $3$-Bromocyclohexanol
$C$. $CH_3-CH(CH_3)-CH_2-CH(OH)-CH(CH_2OH)-CH_3$	$3$. $\text{Hex-}1\text{-en-}3\text{-ol}$
$D$. $CH_2=CH-CH(OH)-CH_2-CH_2-CH_3$	$4$. $2$-Bromo-$3$-methylbut-$2$-en-$1$-ol

Give the general formula of alkyl group with examples up to four carbon.

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