1st Year Chemistry Chapter 21 Test21. Organic Synthesis

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. The function of Al₂O₃ or concentrated H₂SO₄ is to:
   1. Oxidize alcohols
   2. Form esters
   3. Add hydrogen to double bonds
   4. Remove water from a molecule
2. Retrosynthesis is the process of:
   1. Combining simple reactions to make a compound
   2. Distilling alcohols
   3. Separating organic mixtures
   4. Breaking a target compound into simpler precursors
3. Retrosynthesis works in which direction?
   1. Forward direction
   2. Backward from target to precursor
   3. Random reaction sequence
   4. Simultaneous pathway
4. Retrosynthetic analysis is also known as:
   1. Deconstruction
   2. Dehydration
   3. Oxidation
   4. Hydrolysis
5. The reaction scheme outlines the production of one of the monomers of nylon 66 from compound X. {Compound X →KCN in ethanol → $NCCH_2CH_2CH_2CCH_2CN$ → reduction→$H_2N(CH_2)$$6NH_2$.}Which compound could be?
   1. $BrCH_2CH_2CH_2CH_2Br$
   2. $CH_2=CHCH=CH_2$
   3. $HOCH_2CH_2CH_2CH_2OH$
   4. $HO_2CCH_2CH_2CH_2CH_2CO_2H$
6. The condition required for free radical substitution is:
   1. Diffused sunlight
   2. Darkness
   3. High pressure
   4. Acidic medium
7. The reagent used for elimination reaction of alkyl halides is:
   1. NaOH (aqueous)
   2. NaOH (ethanolic)
   3. HCl
   4. H₂SO₄
8. Butanedioic acid may be synthesised in two steps from 1,2-dibromoethane ${BrCH_2CH_2Br → Step 1 → X → Step 2 → HO_2CCH_2CH_2CO_2H}$ Which reagents could be used for this synthesis?
   1. Step 1: HCN(g) Step 2: HCL(aq)
   2. Step 1:$HCO_2Na$(aq) Step 2:HCL(aq)
   3. Step 1:KCN(aq/alcoholic) Step 2: $H_2SO_4$(aq)
   4. Step 1:NaOH(aq) Step 2: $K_2Cr_2O_7/H_2SO_4(aq)$.
9. The iodoform test gives a yellow precipitate of:
   1. CHI₃
   2. CHCl₃
   3. CH₂I₂
   4. CO₂
10. Alkyl halides undergo which reactions?
    1. Nucleophilic substitution and elimination
    2. Addition and oxidation
    3. Substitution and reduction
    4. Oxidation and esterification