AIIMS 2019 Chemistry Geometric Isomerism MCQ Question
Assertion : The melting point of trans-isomer is higher than that of corresponding cis-isomer.
Reason : trans-isomer being symmetrical fits more closely in the crystal lattice than cis-isomer.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
Trans isomers exhibit higher melting points due to their symmetrical structure, which allows for efficient packing in the solid state, resulting in stronger intermolecular forces. This close packing requires more energy to overcome during the melting process. In contrast, cis isomers often have bulky groups that hinder close packing, leading to lower melting points. Thus, the statement correctly identifies the relationship between trans isomer symmetry and melting point.
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