212 -- Which of the following statements about the alkane with the formula ``bond--line'' shown below is correct? ($H=1,\ C=12\ \mathrm{g.mol^{-1}}$)
[Figure: bond-line structure of a branched alkane] - [A)] The name of the compound is 2-ethyl-7-methylnonane.
- [B)] Its molar mass is equal to 4.15 times the molar mass of propane.
- [C)] Its molecular formula is the same as 3-ethyldecane.
- [D)] The number of $\mathrm{CH_2}$ groups in the molecule is $1.5$ times the number of $\mathrm{CH_3}$ groups.
(1) A, T (2) P, T (3) A, B, P (4) B, P, T