a) Give the reaction for following conversions :

i) Furfural to furan

ii) Pyridine to 2-hydroxypyridine

 iii) Thiophene to 2,5-dihydrothiophene

a) Conversions:

i) Furfural to furan: Reaction: Furfural undergoes a cyclization reaction in the presence __________ ________ ____ ________ __________ _________ _____ _________.
_____ ________ _____ ___ _______ _____ _________ ____ ______ ______.
____ ______ ________ ____ _________ _________ _____ _______ ________.
_____ ________ ________ _________ _________ ___ ___ _______ _____ ________ __________.
________ ___ _______ ___ _____ ____.
____ _____ _____ _______ ___ ______ ________ _____ __________.
______ ____ ________ ___ ____ _________ ______ ____.
_______ _____ ____ ________ _______.
_______ ______ ____ ___ _______ ____ _______ __________ _____ _________.
________.
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