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Answer» There is one SECONDARY carbon which is at the middle and there are two secondary hydrogen atoms which are attached to middle secondary carbon atom i.E. - CH2. # the carbon which is attached to other two carbon atoms is called secondary carbon atom. # here in the FORMULA CH3-CH2-CH3 the middle carbon i.e.carbon of -CH2- is attached to adjacent two carbon atoms hence it is secondary carbon atom # the hydrogen atoms attached to secondary carbon atom are called as secondary hydrogen atoms here only one secondary carbon atom is PRESENT to which only 2 hydrogen atoms are attached i. e. hydrogen attached to,,,,,,,,,,,,, -CH2- ............ hence there is 1 secondary carbon and 2 secondary hydrogen atoms
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