Arrange the following compounds 2-Methylhexane in order of their increasing of (A) boiling point and (B) melting point ? (1) n-hexane (2) 2-methyl hexane (3) 2, 2-dimethyl pentane (4) 2, 3-dimethyl pentane.

(A) BoiIing point on alkane is directly proportional to their molecular weight and  inversely proportional to branching. Therefore, the increasing order is (1) < (3) < (4) < (2)   

(B) Melting point of alkane is directly proportional to molecular weight as well as branching of  alkane because increased branching leads to a more compact molecule. Thus the increasing order is (1) < (2) < (4) < (3). 

Benzamide is less easily hydrolysed than methyl benzoate. Why ?

We know that N is less electronegative than oxygen therefore. N can donate a pair of electrons more readily than oxygen.  Therefore, magnitude of positive charge on carbonyl carbon in benzamide is less than in methyl benzoate. Thus during hydrolysis, attack of -OH- ion on carbonyl carbon in benzamide is difficult than in methyl benzoate. Thus benzamide is less easily hydrolysed than methyl benzoate.

Out of Acet.yl chloride and acetic anhydride, acetic anhydride is preferred for acylation reactions. Explain why?

Both acetyl chloride and acetic anhydride are good acetylating agents, however, acetyl chloride is much more reactive than acetic anhydride and hence with acetyl chloride reactions are very fast and difficult to control , and with acetic anhydride can be controlled easily. Therefore, acetic anhydride is preferred over acetyl chloride for acetylation.

More related Questions:

Penta-1,3-diene is more stable than penta-1,4 -diene. Why?

Phenoxide ion is more stable than an alkaoxide. why?

Why does aqueous sodium bicarbonate solution dissolve carboxylic acids but not phenol though they are also acidic?

Why enol form of Beta Dicarbonyl compound more stable than those of monocarbonyl compounds?

Why enol form of phenol is more stable than its keto isomers?

Reactivity order of Pyrrole, Furan and Thiophene towards Electrophilic substitution :

Phenyl group is known to extract negative inductive effect, but each phenyl ring in biphenyl is more reactive than benzene towards Electrophilic substation. Why?

Chloroform is more acidic than fluoroform why?

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Trifluoroethyl carbocation is less stable than trifluromethyl carbocation why ?

Why is the Tropylium carbocation less stable than the tricyclopropylmethyl carbocation?

Arrange the following groups in order of their increasing tendency for nucleophilic addition reactions -COO-, -COOH, -COOCH3, -COCH3, -CHO, -COCI, -CONH2. Justify your answer.

Oxymercuration demercuration hydration procedure is superior to acid- catalysed hydration of most alkenes. Why ?

Out of Acet.yl chloride and acetic anhydride, acetic anhydride is preferred for acylation reactions. Explain why?

Only aldehydes, methyl ketones and cyclic ketones react wilh sodium bisulphite.explain why?

Carbonyl compounds do not undergo nucleophillc substitution reactions.why?

Highly branched carboxylic acids are less acidic than unbranched acids. Explain why?

The carboxylate ion of the branched chain acids is shielded from solvent molecules and thus resists for resonance whereas unbranched acids having lesser solvation effect shows resonance stabilized anion to show more acidic character.

What is Dunstan's test , How can it use for test Glycerol ?

When phenolphthalein is added to dilute cold solution of borax, a pink colour is produced. When glycerol is mixed in it, in cold, the colour disappears, but on heating colour reappears. It is a characteristic test of glycerol. This test is called Dunstan's test.

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Both glucose and fructose are reducing sugars but sucrose is non-reducing in nature. Why?
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N-Ethyl-N-methyl propanamine does not show optical activity why?