Đáp án:

$\rm a)$

CTCT của $\rm C_3H_8O$:

$\rm CH_3-CH_2-CH_2-OH\\CH_3-CH(OH)-CH_3$

CTCT của $\rm C_4H_{10}O$:

$\rm CH_3-CH_2-CH_2-CH_2-OH\\CH_3-CH(CH_3)-CH_2-OH\\CH_3-CH_2-CH(OH)-CH_3\\CH_3-C(OH)(CH_3)-CH_3$

$\rm b)$

CTCT của $\rm C_3H_6O_2$:

$\rm CH_3CH_2COOH\\CH_3COOCH_3\\HCOOC_2H_5$

CTCT của $\rm C_4H_8O_2$:

$\rm CH_3CH_2CH_2 COOH\\CH_3 CH(CH_3)COOH$

CTCT của $\rm C_5H_{10}O_2$:

$\rm CH_3CH_2CH_2CH_2COOH\\CH_3CH(CH_3)CH_2COOH\\CH_3CH_2CH(CH_3)COOH\\(CH_3)_2C(CH_3)COOH$

$\rm c)$

CTCT của $\rm C_4H_8O_2$:

$\rm HCOOCH_2CH_2CH_3\\CH_3COOC_2H_5\\CH_3CH_2COOCH_3$

CTCT của $\rm C_5H_{10}O_2$:

$\rm CH_3CH_2 CH_2 COO CH_3\\CH_3CH(CH_3)COO CH_3\\CH_3CH_2COOCH_2CH_3\\CH_3COOCH_2CH_2CH_3\\CH_3COOCH(CH_3)CH_3\\HCOOCH_2CH_2CH_2CH_3\\HCOO CH(CH_3) CH_2CH_3\\HCOOCH_2CH(CH_3)CH_3\\HCOO C(CH_3)_3$