Question

The number of $1^{\circ },2^{\circ }$, and $3^{\circ }H$ atoms in $2,5,6-trimethyl$ octane, respectively, is

• A. $16,5,3$
• B. $15,6,3$
• C. $16,6,3$
• D. $15,5,2$

Answer 1

The correct option is B $15,6,3$

The number of $1^o,2^o$ and $3^{o}H$ atoms in $2,5,6-$ trimethyl octane is

$1^{o}H=5$ terminal $-C{H}_3$ groups$=15H$

$2^{o}H=3$ internal $-C{H}_2$ groups $=6H$

$3^{o}H=3$ substituted $-CH$ groups $=3H$

Option B is correct.