Single Choice

Propyne and propene can be distinguished by

Aconc. $$H_2SO_4$$
B$$Br_2$$ in $$CCl_4$$
C$$dil. H_2SO_4$$
D$$AgNO_3$$ in ammonia
Correct Answer

Solution

Propyne and propene can be distinguished by $$AgNO_3$$ in $$NH_3.$$ $$AgNO_3$$ in $$NH_3$$ reacts with propyne to give white ppt. to silver propynide while propene does not.

$$CH_3-C\equiv CH+AgNO_3\xrightarrow{NH_4OH} CH_3-C\equiv C-Ag\downarrow$$

$$CH_3-CH= CH_2+AgNO_3\xrightarrow{NH_4OH} $$ No reaction.

SIMILAR QUESTIONS

Biomolecules

Which is the most suitable reagent for the following transformation? $$CH_3-CH = CH-CH_2 - \!\!\!\!\overset{\quad OH}{\overset{|}{C}}\!\!\!\!H- CH_3 \longrightarrow CH_3 - CH = CH - CH_2-COOH$$

Biomolecules

Which of the following compounds exhibit sliver mirror test?

Biomolecules

Positive Tollen's test is observed for:

Biomolecules

Compound $$A$$(molecular formula $${C}_{3}{H}_{8}O$$) is treated with acidified potassium dichromate to form a product $$B$$ (molecular formula $${C}_{3}{H}_{6}O$$). $$B$$ forms a shining silver mirror on warming with ammoniacal silver nitrate. $$B$$ when treated with an aqueous solution of $${H}_{2}NCONH{NH}_{2}.HCl$$ and sodium acetate gives a product $$C$$. Identify the structure of $$C$$ :

Biomolecules

An organic compound contains 69.77% carbon, 11.63% hydrogen and rest oxygen. The molecular mass of the compound is 86. It does not reduce Tollens reagent but forms an addition compound with sodium hydrogensulphite and give positive iodoform test. On vigorous oxidation, it gives ethanoic and propanoic acid. Write the possible structure of the compound.

Biomolecules

An organic compound of molecular formula $$C_3H_6O$$ did not give a silver mirror with Tollens' reagent but give an oxime with hydroxylamine. It may be:

Biomolecules

Five isomeric para-disubstituted aromatic compounds $$(A)$$ to $$(E)$$ with molecular formula $${C}_{8}{H}_{8}{O}_{2}$$ were give for identification. Based on the following observations, give structures of the compounds. (i) Both $$(A)$$ and $$(B)$$ form silver mirror with Tollens reagent. Further, $$(B)$$ gives positve test with $$Fe{Cl}_{3}$$ solution (ii) $$(C)$$ gives positive iodoform test. (iii) $$(D)$$ is readily extracted in aqueous $$NaH{CO}_{3}$$ solution (iv) $$(E)$$ on acid hydrolysis gives 1,4-dihydroxy benzene.

Biomolecules

Which of the following disacharides will not reduced Tollene regent?

Biomolecules

Predict the products formed when cyclohexane carbaldehyde reacts with the following reagents: Tollens reagent

Biomolecules

How will you convert ethanal into the following compounds? Butane-1,3-diol

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