Which of the following statement is not correct ?A First three members of alkenes are gases. B First four members of alkanes are gases. C Grease is mixture of lower alkanes is non-polar and hydrophobic in nature. D With increase in number of branched chains the molecule attains the shape of a sphere.
Question
Which of the following statement is not correct ?A First three members of alkenes are gases. B First four members of alkanes are gases. C Grease is mixture of lower alkanes is non-polar and hydrophobic in nature. D With increase in number of branched chains the molecule attains the shape of a sphere.
Solution
To determine which statement is not correct, let's analyze each option:
A) The statement "First three members of alkenes are gases" is correct. The first three members of alkenes, namely ethene, propene, and butene, are indeed gases at room temperature.
B) The statement "First four members of alkanes are gases" is incorrect. The first four members of alkanes, namely methane, ethane, propane, and butane, are gases at room temperature.
C) The statement "Grease is a mixture of lower alkanes that is non-polar and hydrophobic in nature" is correct. Grease is composed of lower alkanes, which are non-polar and repel water (hydrophobic).
D) The statement "With an increase in the number of branched chains, the molecule attains the shape of a sphere" is incorrect. As the number of branched chains increases, the molecule becomes more compact and less spherical in shape.
Therefore, the correct answer is B) "First four members of alkanes are gases."
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