iran-konkur 2021 Q212

iran-konkur · Other · konkur-riazi_1400_specialized Not Maths
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
\textbf{212 --} Which of the following statements about the alkane with the formula ``bond--line'' shown below is correct? ($H=1,\ C=12\ \mathrm{g.mol^{-1}}$)

\textit{[Figure: bond-line structure of a branched alkane]}

\begin{itemize}
\item[A)] The name of the compound is 2-ethyl-7-methylnonane.
\item[B)] Its molar mass is equal to 4.15 times the molar mass of propane.
\item[C)] Its molecular formula is the same as 3-ethyldecane.
\item[D)] The number of $\mathrm{CH_2}$ groups in the molecule is $1.5$ times the number of $\mathrm{CH_3}$ groups.
\end{itemize}

(1) A, T \quad (2) P, T \quad (3) A, B, P \quad (4) B, P, T

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