Assertion :Iodine reacts with alcohols to give alkyl iodine only in presence of phosphorous. Reason: Phosphorus reacts with $I_{2}$ to give $P I_{3}$ which replaces $O H$ group of alcohol to produce $R - I$
$2 P + 3 I \to 2 P I_{3}$
$3 R O H + P I_{3} \to 3 R I + H_{3} P O_{3}$

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Phosphorus reacts with $I_{2}$ to give $P I_{3}$ which replaces OH group of alcohol to produce R-I
$2 P + 3 I \to 2 P I_{3}$
$3 R O H + P I_{3} \to 3 R I + H_{3} P O_{3}$
Hence, iodine reacts with alcohols to give alkyl iodine only in presence of phosphorous.
Hence, both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Assertion :Iodine reacts with alcohols to give alkyl iodine only in presence of phosphorous. Reason: Phosphorus reacts with I2to give PI3 which replaces OH group of alcohol to produce R−I2P+3I→2PI33ROH+PI3→3RI+H3PO3

Assertion :Iodine reacts with alcohols to give alkyl iodine only in presence of phosphorous. Reason: Phosphorus reacts with $I_{2}$ to give $P I_{3}$ which replaces $O H$ group of alcohol to produce $R - I$
$2 P + 3 I \to 2 P I_{3}$
$3 R O H + P I_{3} \to 3 R I + H_{3} P O_{3}$