SINDH MDCAT 2019 CHEMISTRY#Alkynes#Chemistry of Hydrocarbons671Choose the best answerWhich of the following gases is used for welding purposes? (Sindh MDCAT 2019)AetheneBethaneCpropaneDethyne Like 0 Discuss 0Share
Alcohols and PhenolsPreparation of Alcohols by Reduction of Carboxylic Acids672Choose the best answerReduction of a carboxylic acid with LiAlH₄ gives:AAldehydeBKetoneCPrimary alcoholDSecondary alcohol Like 0 Discuss 0Share
Atomic StructureHydrogen Spectrum and Electronic Transitions673Choose the best answerWhich electronic transition in hydrogen produces the shortest wavelength?An = 4 → n = 1Bn = 2 → n = 1Cn = 4 → n = 2Dn = 3 → n = 1 Like 0 Discuss 0Share
Industrial ChemistryNon-Competitive Inhibition674Choose the best answerWhich statement correctly describes a non-competitive inhibitor?AIt competes directly with the substrate for the active site.BIt binds at another site on the enzyme and changes its activity.CIt always forms a peptide bond with the substrate.DIt increases enzyme activity. Like 0 Discuss 0Share
Atomic StructureShapes of d-Orbitals675Choose the best answerWhich of the following d-orbitals differs in shape from the other four?AdxyBdx²−y²CdyzDdz² Like 0 Discuss 0Share