Identify total number of $3^{o}$ hydrogens and $2^{o}$ hydrogens present in the given compound :
$H_{3} C - C (C H_{3})_{2} - (C H_{2})_{2} - C H (C H_{3})_{2}$

3^{o} H : 2 a n d 2^{o} H : 8

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3^{o} H : 2 a n d 2^{o} H : 6

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3^{o} H : 2 a n d 2^{o} H : 4

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3^{o} H : 1 a n d 2^{o} H : 4

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Solution

The correct option is D $3^{o} H : 1 a n d 2^{o} H : 4$
The expanded structure of the given compound is

Secondary carbons are those which are attached to two carbon atoms and hydrogen atoms residing on secondary carbons are called secondary hydrogens.
Tertiary carbon are those which are attached to three carbon atoms and hydrogen atoms residing on tertiary carbons are called tertiary hydrogens.
So , total $2^{o} H : 4$ and $3^{o} H : 1$

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