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Question

In which of the following arrangement the order is not according to the property indicated against it:

A
F2>Cl2>Br2>I2: oxidising agent
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B
NH3>PH3>AsH3>SbH3>BiH3: basic property
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C
F>Cl>Br>I: electron gain enthalpy
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D
C>Si>Ge>Sn ability to form pπpπ bond
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Solution

The correct option is C F>Cl>Br>I: electron gain enthalpy
Fluorine is the most powerful oxidising agent. F2>Cl2>Br2>I2 Oxidising agent
NH3>PH3>AsH3>SbH3>BiH3 Basic property decreases down the group due to decrease in electronegativity.
C>Si>Ge>Sn Ability to form pπpπ bond . The trend decreases due to less availability of p orbitals for bonding.
F>Cl>Br>I Electron gain enthalpy. The electron gain enthalpy increases down the group due to decrease in electronegativity.

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