Explain why
(i) the dipole moment of chlorobenzene is lower than that of cyclohexyl chloride?
(ii) alkyl halides, though polar, are immiscible with water?
(iii) Grignard reagents should be prepared under anhydrous conditions?

Explain the following : (a) The dipole moment of chlorobenzone is lower than that of cyclohexyl chloride. (b) Alkyl halides, though polar, are immiscible with water. (c) Grignard reagents should be prepared under anhydrous condition.

Give reasons: (i). C-Cl bond length in chlorobenzene is shorter than C-Cl bond length in CH_(3)-Cl (ii). The dipole moment of chlorobenzene is less than of cyclohexyl chloride. (c). S_(N^(1)) reactions are accompanied by racemisation is optically active alkyl halides.

(a) Explain why cleavage of phenyl ethers with HBr always produces phenol and alkyl bromides and not bromobenzene and alkanols. (b) Give reasons for the following: (i) The dipole moment of diethyl ether (1.18D) is lower than that of water (1.84D). (ii) The C-O-C bond angle in ethers is higher than H-O-H angle in water though oxygen is sp3 hybridized in both the cases. (iii) Dimethyl ether is completely miscible with water but diethyl ether is soluble in water to a small extent.

Which of the following is/are incorrect statement (s): (I) CHCl_(3) is less acidic than CHF_(3) (II) Dipole moment of chlorobenzene is more than chlorocyclohexane (III) Dipole moment of fluoromethane is more than chloromethane (IV) NH_(2)NH_(2).HCl show positive test for nitrogen in lassaigne's test (V) Dipole moment of difluoromethane is more than dichloromethane,

How many statements are true for the following pair of compounds ? Cis Trans (i) The dipole moment of trans isomer is zero (ii) The boiling point of cis isomer is more than trans isomer (iii) Cis isomer is more stable than the trans isomer (iv) These are also called configurational diastereomers (v) These are readily interconvertible under normal conditions (vi) The melting point of trans isomer is more than the cis isomer (vii) Trans isomer is more soluble than cis isomer in polar solvents

Explain the following observations : (i) Nitrogen is much less reactive than phosphorus. (ii) Despite having greater polarity, hydrogen fluoride boils at a lower temperature than water.

The study of dipole moment of a molecule is useful to explain the shape of a molecule and also to predict a number of other properties of the molecule. The net dipole moment of a polyatomic is the resultant of the different bond dipole moments present in that molecule. Answer the following questions on the basis of above paragraph : (i) What is dipole moment ? (ii) Out of CO_(2)and H_(2)O, which molecule is polar in nature any why ?

(A) Explain why- (i) Though nitrogen exhibit +5 oxidation state, it does not form pentahalides. (ii) Interhalogen compounds are more reactive than their constituent elements. (iii) The boiling of HF is very high ? (B) Draw the structure of the molecule and state its geometry.

Read the following statements carefully : ( i ) primary succession is a very slow process taking thousands of years for the climax to be reached. (ii) The energy at a higher trophic level is always more than at a lower level (iii) Bacterial and fungal enzymes degrade detritus into simple inorganic substances. This process is called fragmentation . (iv ) All succession, whether taking place in water or on land, proceeds to a similar climax community : the mesic condition . Which of the two above statements are correct ?

Explain (i) Why alkali metals are normally kept in kerosene oil. (ii) Why alkali metal impact colour to the flame? (iii) Explain, why lithium chloride has more covalent character than potassium chloride? (iv) Why BeCO_(3) is kept in an atmosphere of CO_(2) ?