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Alkyl halides are formed when thionyl chloride and _____ are refluxed in presence of pyridine. The order of reactivity `(3^(@)gt2^(@)gt1^(@))` is due to +1 effect of the alkyl group which____ the polarity of C-X bond.
A. acids, decreases
B. alcohols, increases
C. aldehydes, changes
D. ketones, decreases

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