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Reductions Involving Aldehydes or Ketones

Benzene has 3...

Question

Benzene has 3 $π$ bonds in its structures, it de-colourizes a solution of bromine in $C C I_{4}$

A

True

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B

False

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Solution

The correct option is B False

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Q. Statement 1: The double and single bonds in benzene are subject to resonance.
Statement 2: Benzene has de-localized pi electrons that stabilize its structure

An unknown compound has molecular formula

C_{6} H_{10}

.

When a solution of

B r_{2}

C C l_{4}

is added to the unknown, the bromine colour disappears. What information does this provide about the structure of unknown?

1) It has olefinic bond

2) It has aldehydic group

3) It has alcoholic group

Q. Cyclobutadiene (below) is like benzene in that it has alternating single and double bonds in a ring. However, its bonds are not same length, double bonds being shorter than the single bonds; the molecule is rectangular, not square. Explain why it would be incorrect to write resonance structures as shown.

$f (x) = sin x has a local minima at x = \frac{3 π}{2}$ .

Q. (a) Write molecular formula of benzene.
(b) Draw structure formula of benzene and write number of triple bonds present in it.
(c) Which is ethane in the following? Write number of co-operative bonds present in it.
(i)

C_{2} H_{2}

C_{2} H_{4}

C_{2} H_{6}

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