`a)`

`n_{O_2}={1,456}/{22,4}=0,065(mol)`

`m_{binh\ ↑}=m_{H_2O}=0,9(g)`

`->n_{H_2O}={0,9}/{18}=0,05(mol)`

BTNT O: `n_{CO_2}={0,065.2-0,05}/2=0,04(mol)`

`->n_{H_2O}>n_{CO_2}`

`->X` là alkane

`n_X=n_{H_2O}-n_{CO_2}=0,01(mol)`

`C(X)={0,04}/{0,01}=4`

`->X:C_4H_{10}`

`b)`

`CH_3-CH_2-CH_2-CH_3`: butane

`CH_3-CH(CH_3)-CH_3`: 2-methylpropane

`c)`

`CH_3CH_2CH_2CH_3+Cl_2->CH_3CH_2CH_2CH_2Cl+HCl` (1-chlorobutane)

`CH_3CH_2CH_2CH_3+Cl_2->CH_3CH_2CHClCH_3+HCl` (2-chlorobutane)

`CH_3CH(CH_3)CH_3+Cl_2->CH_2ClCH(CH_3)CH_3+HCl` (3-chloro-2-metylpropane)

`CH_3CH(CH_3)CH_3+Cl_2->CH_3CCl(CH_3)CH_3+HCl` (2-chloro-2-metylpropane)