Corey-house synthesis as :
CH2=CHCl + Li ......> CH2=CHLi
CH2=CHLi + CuI .....> (CH2=CH)2CuLi
(CH2=CH)2CuLi + Br-CH2CH2CH2CH2CH3 .....> CH2=CH-CH2CH2CH2CH2CH3 + (CH2=CH)Cu + LiBr
Hence, when vinyl chloride and 1-Bromopentane go corey-house coupling produce 1-heptene
Hence, B option is correct.
Starting from vinyl chloride and as the only source of carbon atoms, 1-heptene can be synthesized...
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