A compound is formed by substitution of two chlorine for two hydrogens in propane. The number of possible isomeric compound is

Which of the following possesses highest melting point?

Which of the following are arranged in the decreasing order of dipole moment?

Which of the following is not chiral?

In the addition of HBr to propene in the absence of peroxides, the first step involves the addition of 

What are ambident nucleophiles?  Explain with an example.

Suggest a possible mechanism for the following reaction:
\(n-BuBr + KCN \xrightarrow{EtOH_2,\ H_2O} n-BuCN\)

Write the structural formulae of the organic compounds 'A', 'B', 'C' and 'D' in the following sequence of reaction

Write chemical equations when
(i) ethyl chloride is treated with aqueous KOH
(ii) chlorobenzene is treated with CH₃COCl in the presence of anhydrous AIC1₃

A hydrocarbon of molecular mass 72 g mol^-1 gives a single monochloro derivative and two dichloro derivatives on photo chlorination.  Give the structure of the hydrocarbon.

Complete the following chemical equations:

Explain why
(a) vinyl chloride is unreactive in nucleophilic substitution reactions?
(b) neo-pentyl bromide undergoes nucleophilic substitution reaction very slowly?
(c) 3-bromocyclohexene is more reactive than 4-bromocyclohexene in hydrolysis with aqueous NaOH?
(d) tert-butyl chloride reacts with aqueous sodium hydroxide by S_N1 mechanism while n-butyl chloride reacts by S_N2 mechanism?

Write the equations for the preparation of 1-iodobutane from:
(a) 1-iodobutane from:
(b) 1-butanol
(c) but-1-ene.

Wurtz reaction falils in case of tert-alkyl halides. Explain.

Some halogen containing compounds are useful in daily life. Some compounds of this class are responsible for exposure of flora and fauna to more and more of UV light which causes destruction to a great extent. Name the class of these halo compounds. In your opinion, what should be done to minimise harmful effects of these compounds.

Carbon compounds containing more than one halogen atom are usually called polyhalogen compounds. Polyhalogen compounds are useful in industry and agriculture. One of the important polyhalogen compound is used as an insecticide.
(i) Name the polyhalogen compound for which Paul Muller won the Nobel Prize in medicine and physiology. Draw its structure also.
(ii) Why is the use of DDT banned in some countries?
(iii) What values do you derive from the answer of above question?

Benzene on reaction with HOCI in presence of an acid produces organic compound (A), (A) on treatment with NaNH₂/liq. NH₃ furnishes another organic compound (B). (B) on treatment with HBF₄ affords an organic compound (C) wich on heating with NaNO₂ gives organic compound (D). Identify (A), (B), (C) and (D).