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Physical Properties of Alkenes

Which alkene ...

Question

Which alkene on heating with alkaline $K M n O_{4}$ solution gives acetone and a gas, which turns lime water milky?

A

2-Methyl-2-butene

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B

Isobutylene

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C

1-Butene

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D

2-Butene

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Solution

The correct option is D Isobutylene
Isobutylene on heating with alkaline KMnO4 solution gives acetone and $C O_{2}$ gas, which turns lime water milky.

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Similar questions

Q. Which alkene on heating with alkaline

K M n O_{4}

solution gives acetone and a gas, which turns lime water milky?

C i s

-2-butene gives

m e s o

-2,3-butanediol with dilute alkaline

K M n O_{4}

solution. Reason: Dilute alkaline

K M n O_{4}

solution given trans addition with alkenes.

Q. An organic compound (A) on heating produces two gases (B) and (C) and neutral oxide (D) which turns cobalt chloride paper pink. Gas (B) turns lime water milky and produces an acidic solution, with water. Gas (C) produces a poisonous gas (E) with chlorine gas, this gas with ammonia gives an organic compound (F) which on further reaction with (D) gives

N H_{3}

gas. Then, compounds (A) and (F) can be found as:

Q. A white-coloured inorganic compound, on heating, gives a gas which turns lime water milky and residue is left which is yellow when hot and turns white on cooling. The compound is

Q. Assertion :Treatment of cis-

2

-butene with cold,dilute and alkaline

K M n O_{4}

solution gives a meso-

2, 3

-butanediol. Reason:

M n O_{4}^{-}

forms a cyclic intermediate with alkene.

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