(a) When cis-2,3-dibromopent-2-ene is hydrogenated with `H_2//Pt`, The product is :
(i) `Meso-2,3` -Dibromopentane
(ii) `(+)2,3` -Dibromopentane
(iii) `(-)2,3` -Dibromopentane
(iv) `(+-)2,3` -Dibromopentane
(b) When trans-2,3-dibromopentane-2-ene is hydrogenated with `H_2//Pt`. The product is :
(i) Meso-2,3 -Dibromopentane
(ii) `(+)2,3` -Dibromopentane
(iii) `(-)2,3` -Dibromopentane
(iv) `(+-)2,3` -Dibromopentane
(c) When `cis-2,3` -dibromopent-2-ene is hydrogenated with Birch reduction. The product is :
(i) Meso-2,3-dibromopentane
(ii) `(+)2,3` -Dibromopentane
(iii) `(-)2,3-` Dibromopentane
(iv) `(+-)2,3` -Dibromopentane
(d) When trans-2,3-dibromopent-2-ene is hydrogenated with `Na + liq. NH_3` + ethanol. The product is :
(i) Meso-2,3-dibromopentane
(ii) `(+)2,3` -Dibromopentane
(iii) `(-)2,3` -Dibromopentane
(iv) `(+-)2,3` -Dibromopentane
(e) When 2-butyne is reduced with Lindlar's catalyst. The product is :
(i) cis-2-Butene
(ii) trans-2-Butene
(iii) Both (i) and (ii)
(iv) None
(f) When 2-Butyne is reacted with `Na + liq. NH_3 + C_2H_5 OH`. The product is :
(i) cis-2-Butene
(ii) trans-2-Butene
(iii) Both (i) and (ii)
(iv) None.

Explanation

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