(Another true story.) A student who was checking into her lab desk found an unlabeled sample from a previous student. She was asked to identify the sample. She did an IR spectrum and declared, “It looks like an alkane.” But it seemed too reactive to be an alkane, so she did a GC–MS. The mass spectrum is shown next. Identify the compound as far as you can, and state what part of your identification is uncertain. Propose fragments corresponding to the numbered peaks.

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100 43 80 71 60 198 40 20 127 155 10 20 30 40 50 60 70 80 90 100 110 120 130' 140 150 160 170 180 190 200 mlz. abundance