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Saturday, September 12, 2020
Among orthochlorophenol and orthofluorophenol, which will be a stronger acid and why?
Alcohols and Phenols both are acidic but phenols are more acidic. Why?
(1)
alcohols fails to turn blue litmus red while phenol do so.
(2) alcohols
fails to neutralize alkalies whereas phenols do so:
(3) Both
phenol and phenoxide ions exhibit resonance, whereas alcohols and alkoxide ion
do not.
(4) Due
to resonance, positive charge 's developed over "O"of phenol, this
weakens O-H bond and facilitates release of a proton. On the other hand. due to
electron donating nature of alkyl group. -O-H bond is strengthened. therefore.
it hinders the release of proton.
(5) The
phenoxide ion is more stable than phenol, due to o greater dispersal of
negative charge, therefore. equilibrium get shifted to forward direction.
whereas alkoxide ion is less stable than alcohols due to intensification of
negative charge, so equilibrium get shifted towards backward direcrion. Due
to these fact it is clear that phenols are more acidic than alcohols.
Related Questions:
(1) Benzamide
is less easily hydrolysed than methyl benzoate. Why ?
(2) Highly
branched carboxylic acids are less acidic than unbranched acids. Explain why?
(3) Phenoxide ion is more stable than an alkaoxide. why?
(4) What
is Steric Inhibition of Deprotonation effect ? Or SID effect ?
(6) Why
is o-toluic acid (2-methyl benzoic acid) stronger than benzoic acid ?
(7) Which
is more acidic 2-methyl benzoic acid , 3-methyl benzoic acid or 4-methyl
benzoic acid.?
Wednesday, September 9, 2020
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Imortant reasoning Questions of Boron family (13th group) for IIT mains/advanced and NEET also !
(1) Why
Ga has small size than Al exceptionally
(2) Why
aqueous solution of borax reacts with two moles of acids ?
What
is structure of solid Ortho Boric acid ?
(3) What
is the structure of trimetaboric acid and trimetaborate ion?
(4) Why
Borazine is more reactive than benzene towards Electrophic Aromatic
substitution reactions ?
(5) Why
Borazine (B3N3H6) is also known as inorganic benzene ?.
(6) Why
B-F bond length in BF3 is shorter (130 pm) than B-F bond Iength in BF4- (143
pm)?. Explain.
(7) Why
B-F do not exist as dimer?. Explain.
(8) Although
anhydrous aluminium chloride is covalent but its aqueous solution is ionic in
nature. Why?
(9) Why
Boric acid become strong acid in the presence of cis 1,2-diol or 1,3-diol ?
(10) Four-center
two-electron bond (4C-2e Bond): Structure of AlCl3:
(11) What is the molecular formula of Borax ?
(12) What
is the difference between the structure of AlCl3 and diborane?
(13) Titration
of Borax: Tincal : Suhaga :
(14) Structure
of Borax: Tincal or Suhaga:
(15) DIBORANE-HYDRIDE
OF BORONE-(B2H6):
(16) CHEMICAL
PROPERTIES OF DIBORANE:
(17) STRUCTURE
OF BORON NITRIDE:
(18) STRUCTURE
OF BORAZINE OR BORAZOLE:
(20) BORIC ACID
(H3BO3) :
(21) BORAX BEAD TEST:
Related Questions:
(1) What are Silicones? explain with examples.
(2) What are "pyro" oxy acids?
(3) What are "Ortho" or "Meta" oxyacids?
(5) What are the structural difference between oxides ( P4O6 and P4O10) of phosphorous?
(6) What are common structural features of oxides (P4O6 and P4O5) of phosphorous?
Sunday, September 6, 2020
What happened when lead oxide is strongly heated ?
When heated, lead(II) nitrate crystals decompose into lead(2)oxide, oxygen and nitrogen dioxide.
2 Pb(NO3)2(s) → 2 PbO (s) + 4 NO2(g) +O2(g)
Due to this property, lead nitrate is used in firewoks.
Related Questions:
What are the SESQUI OXIDES ? give the examples.