Which of the following reactions can be used to prepare alkanes? (a) Wurtz reaction (b) Wolf-kishner reduction (c) Kolbe's electrolysis (d) All of these

Which of the following reactions can be used to prepare alkanes?
(a) Wurtz reaction
(b) Wolf-kishner reduction
(c) Kolbe's electrolysis
(d) All of these
by

1 Answer

Answer :

All of these
by

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Which statements about alkenes and alkanes of corresponding chain lengths is true? (I) Alkenes have slightly lower melting points than alkanes (II) Alkenes have slightly higher melting points than alkanes (III) Alkenes have higher boiling points than alkanes (IV) Alkenes have lower boiling points than alkanes (a) I and III (b) II and IV (c) I and IV (d) II and III

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Consider the three isomeric alkanes n-hexane, 2,3-dimethylbutane, and 2- methylpentane. Which of the following correctly lists these compounds in order of increasing boiling point? (a) 2,3-dimethylbutane < 2-methylpentane < n-hexane (b) 2-methylpentane < n-hexane < 2,3-dimethylbutane (c) 2-methylpentane < 2, 3-dimethylbutane < n-hexane (d) n-hexane < 2-methylpentane < 2,3-dimethylbutane

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In the chlorination of alkanes, the first step in which chlorine free radicals are produced is called (a) initiation(b) activation(c) propagation(d) deactivation:

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Which of the following classes of compounds is unreactive toward sulfuric acid? (a) Alkanes (b) Alcohols (c) Alkenes (d) Alkynes

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How do the boiling points of butane, propane, and ethane compare? (a) the boiling point of ethane is greatestb) the boiling point of butane is greatest. (c) the boiling point of propane is greatest. (d) there is no relationship among these three alkanes and their boiling points.

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Last Answer : the boiling point of butane is greatest.

How does the melting point of propane and ethane compare? (a) the melting point of propane is greater. (b) the melting point of ethane is greater. (c) the melting points are within 5°C of one another. (d) no relationship exists among these alkanes and their melting point

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Last Answer : the melting point of ethane is greater.

The branching of alkanes that produces symmetrical structures : (a) raises the boiling point ; raises the melting point (b) raises the boiling point ; lowers the melting point (c) lowers the boiling point ; lowers the melting point (d) lowers the boiling point ; raises the melting point

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Last Answer : raises the boiling point ; raises the melting point

As the molecular weight of alkanes increases, how do the boiling point and melting point change? (a) boiling point increases ; melting point increases. (b) boiling point increases ; melting point increases. (c) boiling point increases ; melting point decreases (d) boiling point increases ; melting point increases sequentially for alkanes over four carbons.

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Last Answer : boiling point increases ; melting point increases sequentially for alkanes over four carbons.