91Ó°ÊÓ

Identify the correct statement among the following. (a) A hydrocarbon of M.F. \(\mathrm{C}_{6} \mathrm{H}_{12}\) on reductive ozonolysis gave only one product which fails to react with Tollens reagent. The hydrocarbon could be 2,3 dimethyl but- 2 -ene. (b) Addition of bromine to trans-2-butene gives a racemic mixture of two optically active enantiomers. (c) But-1-yne and but-2-yne can be distinguished using ammoniacal cuprous chloride. (d) Ozonolysis of acetylene gives glyoxal.

Which of the following reactions will result in 2,2-dibromopropane? (a) \(\mathrm{CH}_{3} \mathrm{C} \equiv \mathrm{CH}+2 \mathrm{HBr} \rightarrow\) (b) \(\mathrm{CH}_{3}-\mathrm{CBr}=\mathrm{CH}_{2}+\mathrm{HBr} \rightarrow\) (c) \(\mathrm{CH}_{3}-\mathrm{CH}=\mathrm{CH}_{2}+\mathrm{Br}_{2} \rightarrow\) (d) \(\mathrm{CH}_{3} \mathrm{CH}=\mathrm{CHBr}+\mathrm{HBr} \rightarrow\)

The cis hydroxylation of alkenes can be effected by (a) reaction with \(\mathrm{OsO}_{4}\) (b) addition of Baeyer's reagent (c) reaction with \(\mathrm{H}_{2} \mathrm{O}_{2}\) and formic acid (d) reaction with an acid in the presence of water.

Which of the following reactions give an alkyne? (a) sodium fumarate \(\frac{\text { Kolbe's }}{\text { electrolysis }}\) (b) \(\mathrm{CH}_{3} \mathrm{CBr}_{2} \mathrm{CHBr}_{2} \longrightarrow \underset{\mathrm{Zn} \text { /alcohol } / \Delta}{\longrightarrow}\) (c) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CHBr}_{2} \stackrel{\mathrm{NaNH}_{2} / \Delta}{\longrightarrow}\) (d) \(\mathrm{CH}_{3} \mathrm{CHBr}-\mathrm{CH}_{2} \mathrm{Br} \stackrel{\mathrm{NaNH}_{2}}{\longrightarrow}\)