Solution - Career Point

16.[A]NH 2⎯ 0−5°C+ NaNO 2 + 2HCl ⎯⎯→N 2 Cl+ 2H 2 O + NaCl(CH 3 ) 2 N H + Cl – N = N ⎯ −HCl⎯ →26.[A]27.[B]OC NCH 3CH 3N,N-dimethyl cyclopropane carboxamide.NaCl + H 2 SO 4 → NaHSO 4 + HClK 2 Cr 2 O 7 + 2H 2 SO 4 → 2KHSO 4 + 2CrO 3 + H 2 OCrO 3 + 2HCl → CrO 2 Cl 2orange red vapour17.[A](CH 3 ) 2 N N = NOR – C – O – C 2 H 5 + CH 3 MgBr ⎯→:O – OC 2 H 5⎯⎯⎯⎯→R – C−−C 2 H 5 OR CH 3CH 3 MgX⎯⎯⎯⎯ →OCH 328.[C]29.[B]enenCoClCl+Cis-d-isomer−2 MnO 4 + 16H + +8H 2 OClClCoenenCis-l-isomer−C2O 4 ⎯→2Mn 2+ +2CO 2 ++XMgOCH 3+ HOHOH / H⎯⎯ ⎯⎯ →CH 330.[C] Lanthanoid contraction takes place.RCH 3RCH 331.[D] In nitrogen d orbital is absent.18.[C] It is cannizzaro reactionCHO⎯KOH ⎯⎯→ ∆COO – +ClClCH 2 OH19.[C] Phenol is less acidic than acetic acid andp-nitrophenol.OHO – C 2 H 5Anhy.20.[A] + C 2 H 5 I ⎯⎯⎯→C2H5OH40% H21.[C] CH ≡ CH2SO4CH 2 = CH – OH1% HgSO4⎯ Keto ⎯⎯⎯⎯⎯⎯⎯−enoltautomerism→ CH 3 – C – HOAcetaldehyde22.[C] The rate of nitration is greater inhexadeuterobenzene23.[D] Halogenation on alkene occurs by electrophilicaddition.24.[A] Twisted boat is chiral as it does not have planeof symmetry.Cl32.[A] HNO 3 is acidic in nature.33.[A] 2KBr + H 2 SO 4 → K 2 SO 4 + 2HBr34.[A] Due to formation of chelate compound it act asstrong acid and proceed in forward direction.CH – O O – CHBCH – O O – CH +H+35.[B] Na 2 SO 3 + S ⎯ NaOH ⎯⎯→Na 2 S 2 O 3Sod. thiosulphate36.[D] Critical temperature of water is more than O 2due to its dipole moment (Dipole moment ofwater= 1.84 D, Dipole moment of O 2 = 0D.)37.[D] By the process of zone refining, semiconductorslike Si, Ge and Ga are purified.38.[C] Half filled orbitals are more stable incomparison of partial filled.39.[A] The dipole moment ofCH 4 = 0NF 3 = 0.2 DNH 3 = 1.47 DH 2 O = 1.85 D25.[C]C – CH 3OAcetophenone has highest dipole moment.40.[A] Molecule existence is possible in such casewhen no. of bonding electron is greater thanantibonding.XtraEdge for IIT-JEE 115APRIL 2010