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An unknown compound A has been prepared from the reaction of dehalogenation of a tetra halo derivative with zinc and  B is its positional isomer.  B gives a white precipitate with ammoniacal Silver nitrate but not A. A and B maybe 

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a
CH3CH2C≡CH (A) and CH3C≡CCH3 (B)
b
CH3C≡CCH3 (A) and CH3CH2C≡CH (B)
c
CH3CH=C=CH2 (A) and CH3C≡CCH3 (B)
d
CH3CH=C=CH2 (A) and CH3CH2C≡CH (B)

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detailed solution

Correct option is B

[Step 1]: dehalogenation of tetra halo derivative with zinc will give alkyne or dienes[Step 2]: Terminal Alkynes gives white precipitate with ammoniacal Silver nitrate whereas internal Alkynes won’t. It indicates that A is internal alkyne and B is terminal alkyne

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