Problem 41
The total number of monochloro product obtained on chlorination of isopentane is (A) 4 (B) 5 (C) 6 (D) 8
Problem 44
Choose the incorrect statement about ephedrine and its enantiomer (A) The molecular weights of both enantiomers are the same. (B) The boiling point of both enantiomers is different. (C) Both enantiomers rotate the PPL by the same number of degree but in opposite direction. (D) Absolute configuration of shown enantiomer is ( \(1 \mathrm{R}, 2 \mathrm{~S}\) ).
Problem 45
\(P_{1}, P_{2}\)-dimethyl cyclohexene contains exactly three optical isomers. Then \(\left(P_{1}+P_{2}\right)\) is, where \(P_{1}\) and \(P_{2}\) represent position of methyl according to IUPAC (A) Even (B) 3 (C) Variable (D) 9
Problem 46
During hydrolysis of 3-chloro-3-methyl hexane optical purity of product mixture obtained is \(3.5 \%\). The percentage of inverted product obtained is (A) \(96.5 \%\) (B) \(48.25 \%\) (C) \(44.75 \%\) (D) \(51.75 \%\)
Problem 47
Staggered conformation is usually more stable than eclipsed conformation. It is because of overlapping presert in staggered conformation ( \(\mathrm{f}\) stands for filled and \(\mathrm{v}\) for vacant \()\) : (A) \(\sigma(\mathrm{f})-\sigma^{*}(\mathrm{v})\) (B) \(\sigma(\mathrm{f})-\pi(\mathrm{v})\) (C) \(\sigma(\mathrm{f})-\pi(\mathrm{v})\) (D) \(\sigma(\mathrm{v})-\sigma^{*}(\mathrm{f})\)
Problem 49
Compound(s) having more than one stable conformation is (A) Propane (B) Isobutane (C) Butane (D) Neopentane
Problem 50
\((\pm)-2\)-bromobutane indicates (A) Meso compound (B) \(80 \%\) (+)-2-bromobutane and \(20 \%(-)-2\)-bromobutane (C) \(75 \%(+)-2\)-bromobutane and \(25 \%(-)-2\)-bromobutane (D) Equal amount of \((+)-2\)-bromobutane and \((-)-2\)-bromobutane
Problem 52
Enantiomers react with different rate on reaction with chiral (A) Reagents (B) Solvents (C) Catalyst (D) All
Problem 53
The compound having two fold axis of symmetry \(\left(\mathrm{C}_{2}\right)\) is (A) \(\mathrm{CH}_{3} \mathrm{Cl}\) (B) \(\mathrm{CF}_{2} \mathrm{ClBr}\) (C) CFCIBrI (D) \(\mathrm{CCl}_{4}\)
Problem 55
The compound which does not have exactly 4 optical isomers is (A) \(1,2,3\)-trichloropentane (B) \(2,3,4\)-trichloropentane (C) \(1,2,4\)-trichloropentane (D) \(1,2,5\)-trichloropentane
