本题目来源于试卷: Classification of Matter A.2 Classification of Organic Compounds，类别为 IB化学
[单选题]
Which of the following is an evzw avm j -h2hdvy1/ +1n/jr+example of unsaturated hydrocarb/dx k0b.p2clbpq4 l1p ons?
I. $CH_4$
II. $CH_3Cl$
III. $C_2H_4$
IV. $C_2H_2$
A. $IV$ only
B. $II$ and $III$ only
C. $III$ and $IV$ only
D. $I$ and $II$ only
参考答案: C
本题详细解析:
Explanation: Choices III and IV are ethene and ethyne with a double bond and a triple bond, respectively. They belong to the classes of alkenes and alkynes, which can be deduced by the general formulae, $C_{n}H_{2n}$ and $C_{n}H_{2n-2}$ . Choice I is the alkane methane, and choice II is a halogenoalkane (chloromethane).
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