Question

Find the number of $1^{\circ }$, $2^{\circ }$ & $3^{\circ }$ hydrogen atoms in the following compounds :

• A. $1^{\circ }$ H $\to$ 9, $3^{\circ }$ H $\to$ 1
• B. $1^{\circ }$ H $\to$6, $2^{\circ }$ H $\to$ 2, $3^{\circ }$ H $\to$ 2
• C. $1^{\circ }$ H $\to$ 6, $2^{\circ }$ H $\to$ 4
• D. $1^{\circ }$ H $\to$ 9, $2^{\circ }$ H $\to$ 1

Answer 1

The correct option is A $1^{\circ }$ H $\to$ 9, $3^{\circ }$ H $\to$ 1

$1^{\circ }$H, $2^{\circ }$H & $3^{\circ }$H are the hydrogen attached to $1^{\circ }$, $2^{\circ }$ and $3^{\circ }$ carbon atoms respectively. In the given compound, we have three $1^{\circ }$ and one $3^{\circ }$ carbon atoms. Hence we have one $3^{\circ }$ and nine $1^{\circ }$ hydrogens.