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<!--Generated by DFIN XBRL Instance Document - http://www.dfinsolutions.com/ - Version R3.0 - on 13-May-2026 [06:57:50] {AM}-->
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  <import namespace="http://www.xbrl.org/2009/role/negated" schemaLocation="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd" />
  <import namespace="http://www.xbrl.org/2009/role/net" schemaLocation="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd" />
  <import namespace="http://www.xbrl.org/2009/arcrole/fact-explanatoryFact" schemaLocation="http://www.xbrl.org/lrr/arcrole/factExplanatory-2009-12-16.xsd" />
  <import namespace="http://xbrl.sec.gov/dei/2025" schemaLocation="https://xbrl.sec.gov/dei/2025/dei-2025.xsd" />
  <import namespace="http://fasb.org/srt/2025" schemaLocation="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd" />
  <import namespace="http://fasb.org/srt-types/2025" schemaLocation="https://xbrl.fasb.org/srt/2025/elts/srt-types-2025.xsd" />
  <import namespace="http://xbrl.sec.gov/spac/2025q3" schemaLocation="https://xbrl.sec.gov/spac/2025q3/spac-2025q3.xsd" />
  <import namespace="http://xbrl.sec.gov/spac-lab/2025q3" schemaLocation="https://xbrl.sec.gov/spac/2025q3/spac-2025q3_lab.xsd" />
  <import namespace="http://xbrl.sec.gov/spac-com/2025q3" schemaLocation="https://xbrl.sec.gov/spac/2025q3/spac-com-2025q3.xsd" />
  <import namespace="http://xbrl.sec.gov/spac-despac/2025q3" schemaLocation="https://xbrl.sec.gov/spac/2025q3/spac-despac-2025q3.xsd" />
  <import namespace="http://xbrl.sec.gov/spac-proj/2025q3" schemaLocation="https://xbrl.sec.gov/spac/2025q3/spac-proj-2025q3.xsd" />
  <import namespace="http://xbrl.sec.gov/spac-reg/2025q3" schemaLocation="https://xbrl.sec.gov/spac/2025q3/spac-reg-2025q3.xsd" />
  <import namespace="http://www.xbrl.org/dtr/type/2024-01-31" schemaLocation="https://www.xbrl.org/dtr/type/2024-01-31/types.xsd" />
  <import namespace="http://xbrl.sec.gov/dei-sub/2025" schemaLocation="https://xbrl.sec.gov/dei/2025/dei-sub-2025.xsd" />
  <element name="Sk1602SpacRegisteredOfferingsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="racc_Sk1602SpacRegisteredOfferingsAbstract" substitutionGroup="xbrli:item" />
  <element name="Sk1602SpacRegisteredOfferingsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="racc_Sk1602SpacRegisteredOfferingsTable" substitutionGroup="xbrldt:hypercubeItem" />
  <element name="SpacOfferingForepartAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="racc_SpacOfferingForepartAbstract" substitutionGroup="xbrli:item" />
  <element name="SpacOfferingProspectusSummaryAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="racc_SpacOfferingProspectusSummaryAbstract" substitutionGroup="xbrli:item" />
  <element name="LoansMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="racc_LoansMember" substitutionGroup="xbrli:item" />
  <element name="PrivatePlacementSharesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="racc_PrivatePlacementSharesMember" substitutionGroup="xbrli:item" />
  <element name="WorkingCapitalLoansMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="racc_WorkingCapitalLoansMember" substitutionGroup="xbrli:item" />
  <element name="ResearchAllianceCorporationIIIMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="racc_ResearchAllianceCorporationIIIMember" substitutionGroup="xbrli:item" />
  <element name="NetTangibleBookValueAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="racc_NetTangibleBookValueAbstract" substitutionGroup="xbrli:item" />
  <element name="NetTangibleBookValuePerShareAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="racc_NetTangibleBookValuePerShareAbstract" substitutionGroup="xbrli:item" />
  <element name="NumberOfSharesUsedAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="racc_NumberOfSharesUsedAbstract" substitutionGroup="xbrli:item" />
  <element name="DeferredUnderwritingDiscountMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="racc_DeferredUnderwritingDiscountMember" substitutionGroup="xbrli:item" />
  <element name="OfferingCostsAccruedForOrPaidInAdvanceExcludedFromTangibleBookValueMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="racc_OfferingCostsAccruedForOrPaidInAdvanceExcludedFromTangibleBookValueMember" substitutionGroup="xbrli:item" />
  <element name="OrdinarySharesOfferedAndSaleOfPlacementSharesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="racc_OrdinarySharesOfferedAndSaleOfPlacementSharesMember" substitutionGroup="xbrli:item" />
  <element name="OrdinarySharesRedeemedMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="racc_OrdinarySharesRedeemedMember" substitutionGroup="xbrli:item" />
  <element name="Sk1603SpacSponsorConflictsOfInterestAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="racc_Sk1603SpacSponsorConflictsOfInterestAbstract" substitutionGroup="xbrli:item" />
  <element name="Sk1603SpacSponsorConflictsOfInterestTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="racc_Sk1603SpacSponsorConflictsOfInterestTable" substitutionGroup="xbrldt:hypercubeItem" />
  <element name="SpacSponsorItsAffiliatesAndPromotersAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="racc_SpacSponsorItsAffiliatesAndPromotersAbstract" substitutionGroup="xbrli:item" />
  <element name="SpacSponsorCompensationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="racc_SpacSponsorCompensationAbstract" substitutionGroup="xbrli:item" />
  <element name="Sk1605DeSpacBackgroundAndTermsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="racc_Sk1605DeSpacBackgroundAndTermsAbstract" substitutionGroup="xbrli:item" />
  <element name="Sk1605DeSpacBackgroundAndTermsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="racc_Sk1605DeSpacBackgroundAndTermsTable" substitutionGroup="xbrldt:hypercubeItem" />
  <element name="Sk1606DeSpacBoardDeterminationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="racc_Sk1606DeSpacBoardDeterminationAbstract" substitutionGroup="xbrli:item" />
  <element name="Sk1606DeSpacBoardDeterminationTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="racc_Sk1606DeSpacBoardDeterminationTable" substitutionGroup="xbrldt:hypercubeItem" />
  <element name="DespacBoardDeterminationApprovalOfDirectorsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="racc_DespacBoardDeterminationApprovalOfDirectorsAbstract" substitutionGroup="xbrli:item" />
</schema>