Chemistry Problems

Question

In aromatic sulphonation, the attacking species is

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Question

Benzene ring activating groups are

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	– OR and – OH

	– R
	All are correct

Question

Assign R and S configuration to

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	2R, 3R
	None of these
	2R, 3S
	2S, 3S

Question

Which of the following compounds are chiral and resolvable?

1. C_6H_5N(CH_3)(C_2H_5)
2. [C_6H_5N^+(CH_3)(C_2H_5 )(C_3H_7)]Cl^-
3. CH_3-CH_2CH(CH_3)N(CH_3)(C_2H_5)
4.

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	2, 4
	1, 3
	1, 2, 3
	2, 3

Question

Which is the decreasing order of stability of the ions?

1. $CH_3-C\overset {+}{H}-OCH_3$
2. $CH_3-C\overset {+}{H}-CH_3$
3. $CH_3-\overset {+}{C}H-COCH_3$

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	2 > 1 > 3
	1 > 2 > 3
	1 > 3 > 2
	2 > 3 > 1

Question

If two compounds have the same empirical formula but different molecular formulae, they must have

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	different molecular weight.
	different percentage composition.
	same viscosity.
	same vapour density.

Question

Which of the following has least hindered rotation about carbon-carbon bond?

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	Ethylene
	Ethane
	Hexachloroethane
	Acetylene

Question

The Cl – Cl – Cl angle in 1, 1, 2, 2 – Tetrachloroethene and Tetrachloromethane will be about

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Selected	Possible Answer
	$109.5^{\circ} \quad and \quad 90^{\circ}$
	$120^{\circ} \quad and \quad 109.5^{\circ}$
	$109.5^{\circ} \quad and \quad 120^{\circ}$
	$90^{\circ} \quad and \quad 109.5^{\circ}$