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IUPAC name of,

(a) 2-ethyl--3-methyl-hexa-1-en-4-yne

(b) 5-ethyl-4-methyl-hexa-2-yn-5-ene

(c) 3-methylene-4-methylhepta-5-yne

(d) 5-methylene-5-ethyl-4-methylhepta-2-yne