Y neither oxidizes with dichromate nor gives iodoform reaction

Steps:

• Identify functional group of Y from diagram: tertiary alcohol without methyl carbinol structure.
• Check suggestion 1: Tertiary alcohols resist oxidation by hot, acidified K2Cr2O7 as they lack H on carbon bearing OH.
• Check suggestion 2: Iodoform test requires CH3CO- or CH3CH(OH)- group; Y lacks this, so no CHI3 formed.
• Conclude both suggestions false based on structure.

Why D is correct:

• Tertiary alcohols like (CH3)3COH do not oxidize (no aldehydic/ketonic product) and fail iodoform test (no qualifying methyl group).

Why the others are wrong:

• A: Incorrect; Y fits neither reaction.
• B: Incorrect; suggestion 1 false for tertiary alcohol.
• C: Incorrect; suggestion 2 false due to absent iodoform-reactive group.

Final answer: D