[" Which of the following conformers of n-butane has torsional "],[" strain? "],[qquad [CH_(3)],[H_(H)C_(H)^(CH_(3))H],[CH_(3)],[CH_(3)],[H/C_(H)H],[CH_(3)]]

Which among the following are unsturated hydrocarbons ? a) H_(3) C - CH_(2) - CH_(2) - CH_(3) b) H_(3)C - C = C - CH_(3) c) H_(3)C-underset(CH_(3))underset(|)(CH)-CH_(3) d) H_(3)C-underset(CH_(3))underset(|)C=CH_(3)

Total number of the following ethers that can be prepared by Williamson synthesis is : C_(6)H_(5)CH_(2)OC_(6)H_(5),C_(6)H_(5)OC_(6)H_(5),(CH_(3))_(3)COCH_(2)CH_(3),(CH_(3))_(3)COC(CH_(3))_(3),C_(6)H_(5)OCH_(2)CH_(3),CH_(3)OCH_(2)CH_(3)

Which amond the following are unsaturated hydrocarbons ? (i) H_(3)C-CH_(2)-CH_(2)-CH_(3) (ii) H_(3)C-C-=C-CH_(3) (iii) H_(3)C-underset(CH_(3))underset(|" ")(CH)-CH_(3) (iv) H_(3)C-underset(CH_(3))underset(|)C=CH_(2)

Which amond the following are unsaturated hydrocarbons ? (i) H_(3)C-CH_(2)-CH_(2)-CH_(3) (ii) H_(3)C-C-=C-CH_(3) (iii) H_(3)C-underset(CH_(3))underset(|" ")(CH)-CH_(3) (iv) H_(3)C-underset(CH_(3))underset(|)C=CH_(2)