4(2) Among the given compounds , the most susceptible to nucleophilic attack is
(A) MeCOcl
(B) MeCHO
(C) MeCOOMe
(D) MeCOOCOMe
Arrange the following compounds in order of increasing dipole moment
Toulene (I)
m-dichlorobenzene (II)
o - dichlorobenzene (III)
p - dichlorobenzene (IV)
(A) I < IV <II <III
(B) IV < I < II < III
(C) IV < I < III < II
(D) IV < II < I < III
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9 Answers
4
4@Sridhar : Why a for 1 st one ???
@Manmay : I got the same ans as u but answer given matches with sridar's
11)a because
dipole moment in a benzene ring is directly proportional to cosθ2 where θ is the angle between thetwo functional groups. In this case θ is the angle between the two chlorine groups. we know θpara> θmeta>θortho. there fore cosθpara<cosθmeta <cosθortho. Hence the order of dipole moments will be
III>II>IV>I
I will be least because there is no polar group on the benzene ring.
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49doubt is, in IV and I
coz in IV there must be 0 dipole moment becoz the Cl atoms are present in opposite direction will cancel the dipole moments leading to less dipole moment
but in I there is C-C bond hence no dipole moment isn't it???
explain!!
1tHere is no chance of option A to be correct for first question as least dipole moment is of p-dichlorobenzene. dipole moment=0.
so i think answer is B. OR MAY BE D BUT CANNOT BE A OR C
