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JEE CHEMISTRY MCQ: HYDROCARBONS

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A reagent used to test for unsaturation of alkene is

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Correct option: D

Solution of

B{r_2}

in

CC{l_4}

Option D (Solution of

B{r_2}

in

CC{l_4}

) is correct because bromine in carbon tetrachloride decolorizes in the presence of alkenes due to addition across the double bond.

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\mathrm{Ca}{\mathrm{C}_2} + {\mathrm{H}_2}\mathrm{O} \to X\xrightarrow{{{\mathrm{O}_3}/\frac{{{\mathrm{H}_2}\mathrm{O}}}{{\mathrm{O}{\mathrm{H}^ + }}}}}\mathrm{HCOOH} + \mathrm{HCOOH},X\;\mathrm{is}

In benzene, there is a delocalisation of π-electrons. Hence, each π-electron is attached by….carbon nuclei. Which statement is false? Assertion (A) In comparison to ethyl chloride, it is not easy to carry outnucleophilic substitution on vinyl chloride.

Reason (R) Vinyl group is an electron donating. If 2-oxopropanal and methanal are obtained by the reductive ozonolysis of compound (A), then the number of

\sigma

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